loncom/interface/lonstatistics.pm - diff

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Diff for /loncom/interface/lonstatistics.pm between versions 1.2 and 1.80

-version 1.2, 2002/02/05 12:24:45
+version 1.80, 2003/08/29 21:11:25
  Line 1
  # The LearningOnline Network with CAPA
- # (Publication Handler
  #
  # $Id$
  #
- Line 26
+ Line 25
  # http://www.lon-capa.org/
  #
  # (Navigate problems for statistical reports
- # YEAR=2001
+ #
- # 5/05/01, 7/09/01, 7/25/01, 8/11/01,9/13/01, 9/26/01 Behrouz Minaei
- # 10/5/01, 10/9/01, 10/22/01, 10/26/01 Behrouz Minaei
- # 11/1/01, 11/4/01, 11/16/01 Behrouz Minaei
- # 12/14/01, 12/16/01, 12/18/01,12/20/01,12/31/01 Behrouz Minaei
- # YEAR=2002
- # 1/22/02,2/1/02
  ###
+ =pod
+ =head1 NAME
+ lonstatistics
+ =head1 SYNOPSIS
+ Main handler for statistics and chart.
+ =head1 PACKAGES USED
+     use strict;
+     use Apache::Constants qw(:common :http);
+     use Apache::lonnet();
+     use Apache::lonhomework;
+     use Apache::loncommon;
+     use Apache::loncoursedata;
+     use Apache::lonhtmlcommon;
+     use Apache::lonproblemanalysis;
+     use Apache::lonproblemstatistics;
+     use Apache::lonstudentassessment;
+     use Apache::lonpercentage;
+     use Apache::lonmysql;
+ =over 4
+ =cut
  package Apache::lonstatistics;
  use strict;
  use Apache::Constants qw(:common :http);
+ use vars qw(
+     @FullClasslist
+     @Students
+     @Sections
+     @SelectedSections
+     %StudentData
+     @StudentDataOrder
+     @SelectedStudentData
+     $top_map
+     @Sequences
+     @SelectedMaps
+     @Assessments);
  use Apache::lonnet();
  use Apache::lonhomework;
- use HTML::TokeParser;
+ use Apache::loncommon;
- use GDBM_File;
+ use Apache::loncoursedata;
- use Benchmark;
+ use Apache::lonhtmlcommon;
+ use Apache::lonproblemanalysis();
- # -------------------------------------------------------------- Module Globals
+ use Apache::lonproblemstatistics();
- my %hash;
+ use Apache::lonstudentassessment();
- my %CachData;
+ use Apache::lonpercentage;
- my %GraphDat;
+ use Apache::lonmysql;
- my %maps;
+ use Time::HiRes;
- my @mapsort;
- my %section;
- my %StuBox;
- my %DiscFac;
- my $CurMap;
- my $CurSec;
- my $CurStu;
- my @cols;
- my @list;
- my @students;
- my $p_count;
- my $Pos;
- my $r;
- my $OpSel1;
- my $OpSel2;
- my $OpSelDis1;
- my $OpSelDis2;
- my $CurDis=0;
- my $OpSel3;
- my $OpSel4;
- my $GData;
- my $cid;
- my $firstres;
- my $lastres;
- my $DiscFlag=0;
- my $HWN=0;
- my %Header = (0,"Problem Title",1,"#Stdnts",2,"Tries",3,"Mod",
-,"Mean",5,"#YES",6,"#yes",7,"%Wrng",8,"S.D.",
-,"Skew.",10,"DoDiff",11,"Map");
- #             9,"Skew.",10,"DoDiff",11,"Dis.F.",12,"Resourse URL");
- my %class = qw(
- );
- my @LS;
- my @LF;
- sub GetBin {
-     my ($Index1,$Index2,$String,$C)=@_;
-     my @step = 5;
-     my @L=($C eq 'S') ? @LS : @LF;
-     my $Count=$#L+1;
-     $r->print("<br>zone   $C ------ $String ");
-     for(my $n=0;$n<$Count;$n++){
- 	my @t=split(/\:/,$L[$n]);
-         $r->print("<br>$t[$Index1] $t[$Index2]");
-     }
- }
- sub GetUniqe {
+ #######################################################
-     my ($Index,$String,$C)=@_;
+ #######################################################
-     my @step = 5;
-     my @L=($C eq 'S') ? @LS : @LF;
+ =pod
-     my $Count=$#L+1;
-     my @List=();
+ =item Package Variables
-     for(my $n=0;$n<$Count;$n++){
- 	my @t=split(/\:/,$L[$n]);
+ =item @FullClasslist The full classlist
- 	push(@List,$t[$Index]);
-         #$r->print("<br>$t[$Index]");
+ =item @Students The students we are concerned with for this invocation
-     }
-     @List = sort NumSort(@List);
+ =item @Sections The sections available in this class
-     $r->print("<br>zone   $C ------ $String ");
+ =item $curr_student The student currently being examined
-     my $nIdx=0;
-     my $nPrb=0;
+ =item $prev_student The student previous in the classlist
-     my %Proc;
-     undef %Proc;
+ =item $next_student The student next in the classlist
-     while ( $nIdx < $Count ) {
- 	my $Focus=$List[$nIdx];
+ =over
- 	my $Temp = $Focus;
- 	do {
+ =cut
- 	    $nIdx++;
- 	    $nPrb++;
+ #######################################################
- 	    $Focus=$List[$nIdx];
+ #######################################################
- 	    #$Proc{$name}=$Focus;
+ #
- 	} while ( $Focus == $Temp && $nIdx < $Count );
+ # Classlist variables
-         $r->print("<br>$Temp --> $nPrb");
+ #
- 	$nPrb=0;
+ my $curr_student;
-     }
+ my $prev_student;
-     return %Proc;
+ my $next_student;
+ #######################################################
+ #######################################################
+ =pod
+ =item &clear_classlist_variables()
+ undef the following package variables:
+ =over
+ =item @FullClasslist
+ =item @Students
+ =item @Sections
+ =item @SelectedSections
+ =item %StudentData
+ =item @StudentDataOrder
+ =item @SelectedStudentData
+ =item $curr_student
+ =item $prev_student
+ =item $next_student
+ =back
+ =cut
+ #######################################################
+ #######################################################
+ sub clear_classlist_variables {
+     undef(@FullClasslist);
+     undef(@Students);
+     undef(@Sections);
+     undef(@SelectedSections);
+     undef(%StudentData);
+     undef(@SelectedStudentData);
+     undef($curr_student);
+     undef($prev_student);
+     undef($next_student);
  }
- sub GetUniq {
+ #######################################################
-     my ($Index,$String)=@_;
+ #######################################################
-     my @step = 5;
-     my $Count=0;
+ =pod
-     my @List=();
-     my @temp=();
+ =item &PrepareClasslist()
-     foreach (keys(%DiscFac)){
- 	$Count++;
+ Build up the classlist information.  The classlist information is kept in
- 	my @temp1=split(/\:/,$_);
+ the following package variables:
-         @temp=($temp1[$Index],@temp1);
- 	push(@List,join(':',@temp));
+ =over
-     }
-     @List = sort NumericSort(@List);
+ =item @FullClasslist
-     $r->print("<br><br>zone ($Index) ------ $String ----- / $temp[3]");
+ =item @Students
-     my $nIdx=0;
-     my $nPrb=0;
+ =item @Sections
-     my %Proc;
-     undef %Proc;
+ =item @SelectedSections
-     while ( $nIdx < $Count ) {
- 	my ($Focus,$Dummy,$name)=split(/\:/,$List[$nIdx]);
+ =item %StudentData
- 	my $Temp = $Focus;
- 	$Proc{$name}=$Focus;
+ =item @SelectedStudentData
- 	do {
- 	    $nIdx++;
+ =item $curr_student
- 	    $nPrb++;
- 	    ($Focus,$Dummy,$name)=split(/\:/,$List[$nIdx]);
+ =item $prev_student
- 	    $Proc{$name}=$Focus;
- 	} while ( $Focus == $Temp && $nIdx < $Count );
+ =item $next_student
-         $r->print("<br>$Temp --> $nPrb");
- 	$nPrb=0;
+ =back
+ $curr_student, $prev_student, and $next_student may not be defined, depending
+ upon the calling context.
+ =cut
+ #######################################################
+ #######################################################
+ sub PrepareClasslist {
+     my %Sections;
+     &clear_classlist_variables();
+     #
+     # Retrieve the classlist
+     my $cid  = $ENV{'request.course.id'};
+     my $cdom = $ENV{'course.'.$cid.'.domain'};
+     my $cnum = $ENV{'course.'.$cid.'.num'};
+     my ($classlist,$field_names) = &Apache::loncoursedata::get_classlist($cid,
+                                                                   $cdom,$cnum);
+     if (exists($ENV{'form.Section'})) {
+         if (ref($ENV{'form.Section'})) {
+             @SelectedSections = @{$ENV{'form.Section'}};
+         } elsif ($ENV{'form.Section'} !~ /^\s*$/) {
+             @SelectedSections = ($ENV{'form.Section'});
+         }
+     }
+     @SelectedSections = ('all') if (! @SelectedSections);
+     foreach (@SelectedSections) {
+         if ($_ eq 'all') {
+             @SelectedSections = ('all');
+         }
+     }
+     #
+     # Deal with instructors with restricted section access
+     if ($ENV{'request.course.sec'} !~ /^\s*$/) {
+         @SelectedSections = ($ENV{'request.course.sec'});
+     }
+     #
+     # Set up %StudentData
+     @StudentDataOrder = qw/fullname username domain id section status/;
+     foreach my $field (@StudentDataOrder) {
+         $StudentData{$field}->{'title'} = $field;
+         $StudentData{$field}->{'base_width'} = length($field);
+         $StudentData{$field}->{'width'} =
+                                $StudentData{$field}->{'base_width'};
+     }
+     #
+     # get the status requested
+     my $requested_status = 'Active';
+     $requested_status = $ENV{'form.Status'} if (exists($ENV{'form.Status'}));
+     #
+     # Process the classlist
+     while (my ($student,$student_data) = each (%$classlist)) {
+         my $studenthash = ();
+         for (my $i=0; $i< scalar(@$field_names);$i++) {
+             my $field = $field_names->[$i];
+             # Store the data
+             $studenthash->{$field}=$student_data->[$i];
+             # Keep track of the width of the fields
+             next if (! exists($StudentData{$field}));
+             my $length = length($student_data->[$i]);
+             if ($StudentData{$field}->{'width'} < $length) {
+                 $StudentData{$field}->{'width'} = $length;
+             }
+         }
+         push (@FullClasslist,$studenthash);
+         #
+         # Build up a list of sections
+         my $section = $studenthash->{'section'};
+         if (! defined($section) || $section =~/^\s*$/ || $section == -1) {
+             $studenthash->{'section'} = 'none';
+             $section = $studenthash->{'section'};
+         }
+         $Sections{$section}++;
+         #
+         # Only put in the list those students we are interested in
+         foreach my $sect (@SelectedSections) {
+             if ( (($sect eq 'all') ||
+                   ($section eq $sect)) &&
+                  (($studenthash->{'status'} eq $requested_status) ||
+                   ($requested_status eq 'Any'))
+                  ){
+                 push (@Students,$studenthash);
+                 last;
+             }
+         }
+     }
+     #
+     # Put the consolidated section data in the right place
+     if ($ENV{'request.course.sec'} !~ /^\s*$/) {
+         @Sections = ($ENV{'request.course.sec'});
+     } else {
+         @Sections = sort {$a cmp $b} keys(%Sections);
+         unshift(@Sections,'all'); # Put 'all' at the front of the list
+     }
+     #
+     # Sort the Students
+     my $sortby = 'fullname';
+     $sortby = $ENV{'form.sort'} if (exists($ENV{'form.sort'}));
+     my @TmpStudents = sort { $a->{$sortby} cmp $b->{$sortby} ||
+                              $a->{'fullname'} cmp $b->{'fullname'} } @Students;
+     @Students = @TmpStudents;
+     #
+     # Now deal with that current student thing....
+     $curr_student = undef;
+     if (exists($ENV{'form.SelectedStudent'})) {
+         my ($current_uname,$current_dom) =
+             split(':',$ENV{'form.SelectedStudent'});
+         my $i;
+         for ($i = 0; $i<=$#Students; $i++) {
+             next if (($Students[$i]->{'username'} ne $current_uname) ||
+                      ($Students[$i]->{'domain'}   ne $current_dom));
+             $curr_student = $Students[$i];
+             last; # If we get here, we have our student.
+         }
+         if (defined($curr_student)) {
+             if ($i == 0) {
+                 $prev_student = undef;
+             } else {
+                 $prev_student = $Students[$i-1];
+             }
+             if ($i == $#Students) {
+                 $next_student = undef;
+             } else {
+                 $next_student = $Students[$i+1];
+             }
+         }
+     }
+     #
+     if (exists($ENV{'form.StudentData'})) {
+         if (ref($ENV{'form.StudentData'}) eq 'ARRAY') {
+             @SelectedStudentData = @{$ENV{'form.StudentData'}};
+         } else {
+             @SelectedStudentData = ($ENV{'form.StudentData'});
+         }
+     } else {
+         @SelectedStudentData = ('username');
+     }
+     foreach (@SelectedStudentData) {
+         if ($_ eq 'all') {
+             @SelectedStudentData = ('all');
+             last;
+         }
      }
-     return %Proc;
+     #
+     return;
  }
- sub NumericSort {
-     $a <=> $b;
- }
+ #######################################################
+ #######################################################
- #------- Classification
+ =pod
- sub Classify {
-     my $Count=0;
+ =item get_students
-     my @List=();
- #    foreach(keys %class){
+ Returns a list of the selected students
- #        $r->print("<br>$_ --> $class{$_}");
- #    }
+ =cut
- 	   # $DiscFac{($DisFactor.':'.$sname.':'.$ProbTot.':'.$TotalOpend.':'.
-             #          $TotalTries.':'.$ProbSolved.':'.$time)}=$Dis;
-     @LS=();
-     @LF=();
-     my $cf=0;
-     my $cs=0;
-     foreach (keys(%DiscFac)){
- 	my @l=split(/\:/,$_);
- 	if ($class{$l[1]}){
- 	    if( $class{$l[1]} == 4 ) {
- 		$cs++;
- 		push(@LS,('S:'.$l[6].':'.$l[0].':'.$l[5].':'.$l[4].':'.$l[3].':'.$class{$l[1]}));
- 	    }
- 	    elsif ( $class{$l[1]} < 3 ) {
- 		$cf++;
- 		push(@LF,('F:'.$l[6].':'.$l[0].':'.$l[5].':'.$l[4].':'.$l[3].':'.$class{$l[1]}));
- 	    }
- 	}
-     }
-     $r->print("<br>zone successful");
-     for(my $n=0;$n<$cs;$n++){
- 	$r->print('<br>'.$LS[$n]);
-     }
-     $r->print("<br>zone failed");
-     for(my $n=0;$n<$cf;$n++){
- 	$r->print('<br>'.$LF[$n]);
-     }
- #    my %Disc = &GetUniqe(@List,5,"Discrimination Factor");
- #    my %Opnd = &GetUniq(@List,3,"Total Opened");
- #    my %Trys = &GetUniq(@Lsit4,"Total Tries");
- #    my %Slvd = &GetUniq(5,"Problems Solved");
-    # my (@L, $Index,$String)=@_;
-     my %Time = &GetUniqe(1,"Time",'S');
-     &GetUniqe(1,"Time",'F');
-     &GetUniqe(2,"Discrimination Factor",'S');
-     &GetUniqe(2,"Discrimination Factor",'F');
-     &GetUniqe(3,"Solved",'S');
-     &GetUniqe(3,"Solved",'F');
-     &GetUniqe(4,"Tries",'S');
-     &GetUniqe(4,"Tries",'F');
-     &GetBin(1,2, "  Time ... Discriminat",'S');
-     &GetBin(1,2, "  Time ... Discriminat",'F');
-     &GetBin(1,3, "  Time ... Solved",'S');
-     &GetBin(1,3, "  Time ... Solved",'F');
-     &GetBin(1,4, "  Time ... Tries",'S');
-     &GetBin(1,4, "  Time ... Tries",'F');
-     &GetBin(2,3, "  Discriminant ... Solved",'S');
-     &GetBin(2,3, "  Discriminant ... Solved",'F');
-     &GetBin(2,4, "  Discriminant ... Tries",'S');
-     &GetBin(2,4, "  Discriminant ... Tries",'F');
-     &GetBin(3,4, "  Solved ... Tries",'S');
-     &GetBin(3,4, "  solved ... Tries",'F');
- #    foreach (keys(%Disc)) {
- #        $r->print("<br>: $Disc{$_} --> $Slvd{$_}");
-  #   }
-  #   $r->print("<br>..........Discriminant ...  Time................");
-  ##   foreach (keys(%Disc)) {
-  #       $r->print("<br>$Disc{$_} --> $Time{$_}");
-   #  }
-   #  $r->print("<br>..........Time ...  Solved.......................");
-   #  foreach (keys(%Disc)) {
-   #      $r->print("<br>$Disc{$_} --> $Slvd{$_}");
-   #  }
- }
- #------- Processing upperlist and lowerlist according to each problem
+ #######################################################
- sub ProcessDisc {
+ #######################################################
-     my @List = @_;
+ sub get_students {
-     @List = sort (@List);
+     if (! @Students) {
-     my $Count = $#List+1;
+         &PrepareClasslist()
-     my $Prb;
-     my @Dis;
-     my $Slvd=0;
-     my $tmp;
-     my $Sum=0;
-     my $nIdx=0;
-     my $nStud=0;
-     my %Proc;
-     undef %Proc;
-     while ($nIdx<$Count) {
- 	($Prb,$tmp)=split(/\=/,$List[$nIdx]);
- 	@Dis=split(/\+/,$tmp);
- 	my $Temp = $Prb;
- 	do {
- 	    $nIdx++;
- 	    $nStud++;
- 	    $Sum += $Dis[$CurDis];
- 	    ($Prb,$tmp)=split(/\=/,$List[$nIdx]);
- 	    @Dis=split(/\+/,$tmp);
- 	} while ( $Prb eq $Temp && $nIdx < $Count );
- #	$Proc{$Temp}=$Sum.':'.$nStud;
- 	$Proc{$Temp}=($Sum/$nStud).':'.$nStud;
- #        $r->print("$nIdx) $Temp --> ($nPrb) $Proc{$Temp} <br>");
- 	$Sum=0;
- 	$nStud=0;
      }
-     return %Proc;
+     return @Students;
  }
- #------- Creating Discimination factor table
+ #######################################################
- sub DiscriminationTable {
+ #######################################################
-     my $Count=0;
-     foreach (keys(%DiscFac)){
+ =pod
- 	$Count++;
-     }
+ =item &current_student()
-     my $UpCnt = int(0.27*$Count);
-     $r->print("<br><br>".
+ Returns a pointer to a hash containing data about the currently
-               "Current map: <b>\"$CurMap\"</b> &nbsp;&nbsp;&nbsp; ".
+ selected student.
-               "Current Section: <b>\"$CurSec\" </b>&nbsp;&nbsp;&nbsp;".
-               "Number of valid students: <b>$Count</b>".
+ =cut
-               "<br>The <b>Upper 27%</b> has <b>$UpCnt</b> records.".
-               "&nbsp;&nbsp;The <b>Lower 27%</b> has <b>$UpCnt</b> records <br>".
+ #######################################################
-               "The Criterion of sorting the students: ".
+ #######################################################
-               "<b>( Sum of Partial Credits Awarded / ".
+ sub current_student {
-               "Total Number of Tries )</b>".
+     return $curr_student;
-               " <br><br>");
-     $r->rflush();
-     my $low=0;
-     my $up=$Count-$UpCnt;
-     my @UpList=();
-     my @LowList=();
-     $Count=0;
-     foreach my $key (sort(keys(%DiscFac))){
- 	$Count++;
- #        $r->print("$Count) $key <br>");
- 	if ($low < $UpCnt || $Count > $up) {
- 	    $low++;
- 	    my $str=$DiscFac{$key};
- #            $r->print("$Count) $str <br>");
- 	    foreach(split(/\:/,$str)){
- 		if ($_) {
- 		    if ($low<$UpCnt){push(@LowList,$_);}
- 		    else {push(@UpList,$_);}
- 		}
- 	    }
- 	}
-     }
-     my %Up=&ProcessDisc(@UpList);
-     my %Low=&ProcessDisc(@LowList);
-     my @list = ();
-     my $Useful;
-     my $UnUseful;
-     $p_count = 0;
-     foreach my $key( keys %CachData) {
- 	my @Temp=split(/\:/,$CachData{$key});
- 	($UnUseful,$Useful)=split(/\>/,$Temp[0]);
- 	$list[$p_count]=$Useful.'&'.$CachData{$key};
-         $p_count++;
-     }
-     @list = sort MySort (@list);
-     my $Result = "\n".'<table border=2>';
-     $Result .= "\n".'<tr><th>P#</th>';
-     $Result .= "\n".'<th>'.$Header{0}.'</th>';
-     $Result .= "\n".'<th>'.'Discrimination Factor'.'</th>';
-     $Result .= "\n".'<th>'.'%Upper Award'.'</th>';
-     $Result .= "\n".'<th>'.'%Lower Award'.'</th>';
-     $Result .= "\n".'<th>'.'Upper Records'.'</th>';
-     $Result .= "\n".'<th>'.'Lower Records'.'</th>';
-     $Result .= "\n".'<th>'.'%Degree of Difficulty'.'</th>';
-     $Result .= "\n".'</tr>';
-     $r->print( $Result );
-     for ( my $nIdx = 0; $nIdx < $p_count; $nIdx++ ) {
- 	my( $Pre, $Post ) = split(/\&/,$list[$nIdx]);
- 	my ($Temp,$MxTries,$StdNo,$TotalTries,$YES,$Override,
-             $Wrng,$Avg,$SD,$Sk,$DoD,$res,$Prob)=split(/\:/,$Post);
- 	my ($UpDis,$UpNo)=split(/\:/,$Up{$Prob});
- 	my ($LwDis,$LwNo)=split(/\:/,$Low{$Prob});
- 	$UpNo = ($UpNo) ? $UpNo : 0;
- 	$LwNo = ($LwNo) ? $LwNo : 0;
- 	my $U_Dis = sprintf("%.4f", $UpDis)*100;
- 	my $L_Dis = sprintf("%.4f", $LwDis)*100;
- 	my $DisFac = $UpDis - $LwDis;
- 	my $_Dis = sprintf("%.4f", $DisFac)*100;
-         $r->print( "\n".'<tr>'.
-                    "\n".'<td>'.($nIdx+1).'</td>'.
-                    "\n".'<td>'.$Temp.'</td>'.
-                    "\n".'<td>'.$_Dis.'</td>'.
-                    "\n".'<td>'.$U_Dis.'</td>'.
-                    "\n".'<td>'.$L_Dis.'</td>'.
-                    "\n".'<td>'.$UpNo.'</td>'.
-                    "\n".'<td>'.$LwNo.'</td>'.
-                    "\n".'<td>'.$DoD.'</td>'.
-                    "\n".'</tr>' );
-     }
-     $r->print("\n".'</table>');
-     $r->rflush();
  }
- sub CreateDiscFac {
+ #######################################################
+ #######################################################
-     my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
+ =pod
-                   "_$ENV{'user.domain'}_$cid\_statistics.db";
-     my $CachDisFac = "/home/httpd/perl/tmp/$ENV{'user.name'}".
+ =item &previous_student()
- 		     "_$ENV{'user.domain'}_$cid\_DiscFactor.db";
+ Returns a pointer to a hash containing data about the student prior
-     my $ptr='';
+ in the list of students.  Or something.
- #    $ptr .= '<br><b> Discrimination Criterion: &nbsp; </b>'."\n".
- #            '<select name="DisType"> <option '.$OpSelDis1.'>  Total Numebr of Correct Answers </option>'."\n".
+ =cut
- #	    '<option '.$OpSelDis2.'></option>Sum of Partial Awarded Credits / Total Number of Tries  </select> '."\n";
-     $ptr .= '<br><input type="submit" name="sort" '.
+ #######################################################
-             'value="Recalculate Discrimintion Factor" />';
+ #######################################################
-     $r->print($ptr);
+ sub previous_student {
+     return $prev_student;
-     if ((-e "$CacheDB")&&
-          ($ENV{'form.sort'} ne 'Recalculate Discrimintion Factor')) {
- 	if (tie(%CachData,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
-             tie(%DiscFac,'GDBM_File',$CachDisFac,&GDBM_READER,0640);
-             #&DiscriminationTable();
- 	    &Classify();
-         }
-         else {$r->print("Unable to tie hash to db file");}
-     }
-     else {
- 	if (tie(%CachData,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
- 	    tie(%DiscFac,'GDBM_File',$CachDisFac,&GDBM_WRCREAT,0640);
- 	    foreach (keys %CachData) {delete $CachData{$_};}
- 	    foreach (keys %DiscFac) {delete $DiscFac{$_};}
- 	    $DiscFlag=1;
- 	    &Build_Statistics();
- 	    $DiscFlag=0;
-             &DiscriminationTable();
- 	}
-         else {$r->print("Unable to tie hash to db file");}
-     }
-     untie(%CachData);
-     untie(%DiscFac);
- }
- # ------ Create different Student Report
- sub StudentReport {
-     my ($sname,$sdom)=@_;
-     if ( $sname eq 'All Students' ) {
- 	$r->print( '<h3><font color=blue>WARNING:
-                     Please select a student</font></h3>' );
- 	return;
-     }
-     my $shome=&Apache::lonnet::homeserver( $sname,$sdom );
-     my $reply=&Apache::lonnet::reply('dump:'.$sdom.':'.$sname.':'.$cid,$shome );
-     my %result = ();
-     my $ResId;
-     my $Code;
-     my $Tries;
-     my $TotalTries = 0;
-     my $ParCr = 0;
-     my $Wrongs;
-     my %TempHash;
-     my $Version;
-     my $LatestVersion;
-     my $PtrTry='';
-     my $PtrCod='';
-     my $SetNo=0;
-     my $Str = "\n".'<table border=2>'.
-               "\n".'<tr>'.
-               "\n".'<th> # </th>'.
- 	      "\n".'<th> Set Title </th>'.
- 	      "\n".'<th> Results </th>'.
- 	      "\n".'<th> Tries </th>'.
- 	      "\n".'</tr>';
-     unless ($reply=~/^error\:/) {
-         map {
-             my ($name,$value)=split(/\=/,&Apache::lonnet::unescape($_));
-             $result{$name}=$value;
-         } split(/\&/,$reply);;
-         foreach $ResId (@cols) {
- 	    if ( !$ResId ) {
- 		my $Set=&Apache::lonnet::declutter($hash{'map_id_'.$1});
- 		if ( $Set ) {
- 		    $SetNo++;
- 		    $Str .= "\n"."<tr>".
- 			    "\n"."<td> $SetNo </td>".
-                             "\n"."<td> $Set </td>".
-                             "\n"."<td> $PtrCod </td>".
-                             "\n"."<td> $PtrTry</td>".
-                             "\n"."</tr>";
- 		}
- 		$PtrTry='';
- 		$PtrCod='';
- 		next;
- 	    }
-             $ResId=~/(\d+)\.(\d+)/;
-             my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
-             if ( $CurMap ne 'All Maps' ) {
- 		my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
- 		if ( $Map ne $ResMap ) { next; }
- 	    }
- 	    my $meta=$hash{'src_'.$ResId};
- 	    my $PartNo = 0;
- 	    undef %TempHash;
- 	    map {
- 		if ($_=~/^stores\_(\d+)\_tries$/) {
-                     my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
- 		    if ( $TempHash{"$Part"} eq '' ) {
- 			$TempHash{"$Part"} = $Part;
- 			$TempHash{$PartNo}=$Part;
- 			$TempHash{"$Part.Code"} = '-';
- 			$PartNo++;
- 		    }
- 		}
-             } split(/\,/,&Apache::lonnet::metadata($meta,'keys'));
-             my $Prob = $Map.'___'.$2.'___'.
-                        &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
-             $Code='U';
-             $Tries = 0;
-             $Wrongs = 0;
-   	    $LatestVersion = $result{"version:$Prob"};
- 	    if ( $LatestVersion ) {
- 		for ( my $Version=1; $Version<=$LatestVersion; $Version++ ) {
- 		    my $vkeys = $result{"$Version:keys:$Prob"};
- 		    my @keys = split(/\:/,$vkeys);
- 		    foreach my $Key (@keys) {
- 			if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
- 			    my $Part = $1;
- 			    $Tries = $result{"$Version:$Prob:resource.$Part.tries"};
- 			    $TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0;
- 			    $TotalTries += $Tries;
- 			    my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
- 			    if ( $Val eq 'correct_by_student' )
-                                 { $Wrongs = $Tries - 1; $Code = 'Y'; }
- 			    elsif ( $Val eq 'correct_by_override' )
-                                 { $Wrongs = $Tries - 1; $Code = 'y'; }
- 			    elsif ( $Val eq 'incorrect_attempted' ||
-                                 $Val eq 'incorrect_by_override' )
- 		                { $Wrongs = $Tries; $Code = 'N'; }
- 			    $TempHash{"$Part.Code"} = $Code;
- 			    $TempHash{"$Part.Wrongs"} = $Wrongs;
- 			}
-      		    }
-                 }
- 		for ( my $n = 0; $n < $PartNo; $n++ ) {
- 		    my $part = $TempHash{$n};
- 		    if ($PtrTry ne '') {$PtrTry .= ',';}
- 		    $PtrTry .= "$TempHash{$part.'.Tries'}";
-                     $PtrCod .= "$TempHash{$part.'.Code'}";
- 		}
-             }
- 	    else {
- 		for(my $n=0; $n<$PartNo; $n++) {
- 		    if ($PtrTry ne '') {$PtrTry .= ',';}
- 		    $PtrTry .= "0";
-                     $PtrCod .= "-";
- 		}
- 	    }
-         }
-     }
-     $Str .= "\n".'</table>';
-     $r->print($Str);
-     $r->rflush();
  }
+ #######################################################
+ #######################################################
+ =pod
+ =item &next_student()
- # ------------------------------------------- Prepare Statistics Table
+ Returns a pointer to a hash containing data about the next student
- sub PreStatTable {
+ to be viewed.
-     my $CacheDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                   "_$ENV{'user.domain'}_$cid\_statistics.db";
-     my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
-                   "_$ENV{'user.domain'}_$cid\_graph.db";
-     my $CachDisFac = "/home/httpd/perl/tmp/$ENV{'user.name'}".
- 		     "_$ENV{'user.domain'}_$cid\_DiscFactor.db";
-     $r->print('<br><input type="submit" name="sort" value="Recalculate Statistics" />');
-     my $Ptr = '';
-     $Ptr .= '<br><b> Sorting Type: &nbsp; </b>'."\n".
-             '<select name="order"> <option '.$OpSel1.' >Ascending</option>'."\n".
- 	    '<option '.$OpSel2.'>Descending</option> </select> '."\n";
-     $Ptr .= '&nbsp;&nbsp;&nbsp;';
-     $Ptr .= '<input type="submit" name="sort" value="DoDiff Graph" />'."\n";
-     $Ptr .= '&nbsp;&nbsp;&nbsp;';
-     $Ptr .= '<input type="submit" name="sort" value="%Wrong Graph" />'."\n";
-     $Ptr .= '<pre>'.
-     '  #Stdnts: Total Number of Students opened the problem.<br>'.
-     '  Tries  : Total Number of Tries for solving the problem.<br>'.
-     '  Mod    : Maximunm Number of Tries for solving the problem.<br>'.
-     '  Mean   : Average Number of the tries. [ Tries / #Stdns ]<br>'.
-     '  #YES   : Number of students solved the problem correctly.<br>'.
-     '  #yes   : Number of students solved the problem by override.<br>'.
-     '  %Wrng  : Percentage of students tried to solve the problem but'.
-     ' still incorrect. [ 100*((#Stdnts-(#YES+#yes))/#Stdnts) ]<br>'.
-     '  S.D.   : Standard Deviation of the tries.'.
-     '[ sqrt(sum((Xi - Mean)^2)) / (#Stdnts-1)'.
-     ' where Xi is every student\'s tries ]<br>'.
-     '  Skew.  : Skewness of the students tries.'.
-     ' [ (sqrt( sum((Xi - Mean)^3) / #Stdnts)) / (S.D.^3) ]<br>'.
- #    '  DoDiff : Degree of Difficulty of the problem. [ Tries/(#YES+#yes+0.1) ]<br>'.
-     '  DoDiff : Degree of Difficulty of the problem. [ 1 - ((#YES+#yes) / Tries) ]<br>'.
- #    '  Dis.F. : Discrimination Factor. [ Sum of Partial Credits Awarded / Total Number of Tries in %27 upper and lower students]</b>'.
-             '</pre>';
-     $r->print($Ptr);
-     $r->rflush();
-     my $Result = "\n".'<table border=2>';
-     $Result .= '<tr><th>P#</th>'."\n";
-     for ( my $nIdx=0; $nIdx < 12; $nIdx++ ) {
- 	$Result .= '<th>'.'<input type="submit" name="sort" value="'.
-                    $Header{$nIdx}.'" />'.'</th>'."\n";
-     }
-     $Result .= "\n".'</tr>'."\n";
-     $r->print( $Result );
-     $r->rflush();
-     if ((-e "$CacheDB")&&($ENV{'form.sort'} ne 'Recalculate Statistics')) {
+ =cut
- 	if (tie(%CachData,'GDBM_File',"$CacheDB",&GDBM_READER,0640)) {
- 	    tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
- 	    &Cache_Statistics();
-         }
-         else {
- 	    $r->print("Unable to tie hash to db file");
-         }
-     }
-     else {
- 	if (tie(%CachData,'GDBM_File',$CacheDB,&GDBM_WRCREAT,0640)) {
- 	    tie(%DiscFac,'GDBM_File',$CachDisFac,&GDBM_WRCREAT,0640);
- 	    tie(%GraphDat,'GDBM_File',$GraphDB,&GDBM_WRCREAT,0640);
- 	    foreach (keys %DiscFac) {delete $CachData{$_};}
- 	    foreach (keys %CachData) {delete $CachData{$_};}
- 	    $DiscFlag=0;
- 	    &Build_Statistics();
- 	}
-         else {
- 	    $r->print("Unable to tie hash to db file");
-         }
-     }
-     #$r->print('Total instances of the problems : '.($p_count*($#students+1)));
-     untie(%CachData);
-     untie(%GraphDat);
-     untie(%DiscFac);
-     $r->print("\n".'</table>'."\n");
+ #######################################################
-     $r->rflush();
+ #######################################################
+ sub next_student {
+     return $next_student;
  }
+ #######################################################
+ #######################################################
+ =pod
- # ------------------------------------- Find the section of student in a course
+ =item &clear_sequence_variables()
- sub usection {
+ =cut
-     my ($udom,$unam,$courseid)=@_;
-     $courseid=~s/\_/\//g;
+ #######################################################
-     $courseid=~s/^(\w)/\/$1/;
+ #######################################################
-     map {
+ sub clear_sequence_variables {
-         my ($key,$value)=split(/\=/,$_);
+     undef($top_map);
-         $key=&Apache::lonnet::unescape($key);
+     undef(@Sequences);
-         if ($key=~/^$courseid(?:\/)*(\w+)*\_st$/) {
+     undef(@Assessments);
-             my $section=$1;
-             if ($key eq $courseid.'_st') { $section=''; }
- 	    my ($dummy,$end,$start)=split(/\_/,&Apache::lonnet::unescape($value));
-             $section=($section) ? $section : '(none)';
-             $section=(int($section)) ? int($section) : $section;
- #            $r->print($unam.'...'.$section.'<br>');
- 	    return $section;
-         }
-     } split(/\&/,&Apache::lonnet::reply('dump:'.$udom.':'.$unam.':roles',
-                         &Apache::lonnet::homeserver($unam,$udom)));
-     return '';
  }
+ #######################################################
+ #######################################################
- # ------ Dump the Student's DB file and handling the data for statistics table
+ =pod
- sub ExtractStudentData {
+ =item &SetSelectedMaps($elementname)
-     my ($student,$coid)=@_;
-     my ($sname,$sdom) = split( /\:/, $student );
+ Sets the @SelectedMaps array from $ENV{'form.'.$elementname};
-     my $shome=&Apache::lonnet::homeserver( $sname,$sdom );
-     my $reply=&Apache::lonnet::reply('dump:'.$sdom.':'.$sname.':'.$coid,$shome );
+ =cut
-     my %result = ();
-     my $ResId;
+ #######################################################
-     my $Dis = '';
+ #######################################################
-     my $Code;
+ sub SetSelectedMaps {
-     my $Tries;
+     my $elementname = shift;
-     my $ParCr;
+     if (exists($ENV{'form.'.$elementname})) {
-     my $TotalTries = 0;
+         if (ref($ENV{'form.'.$elementname})) {
-     my $TotalOpend = 0;
+             @SelectedMaps = @{$ENV{'form.'.$elementname}};
-     my $ProbSolved = 0;
+         } else {
-     my $ProbTot = 0;
+             @SelectedMaps = ($ENV{'form.'.$elementname});
-     my $TimeTot = 0;
+         }
-     my $TotParCr = 0;
+     } else {
-     my $Wrongs;
+         @SelectedMaps = ('all');
-     my %TempHash;
-     my $Version;
-     my $LatestVersion;
-     my $SecLimit;
-     my $MapLimit;
-     unless ($reply=~/^error\:/) {
-         map {
-             my ($name,$value)=split(/\=/,&Apache::lonnet::unescape($_));
-             $result{$name}=$value;
- #$r->print($name.'='.$value.'<br>');
-         } split(/\&/,$reply);
-         foreach $ResId (@cols) {
- 	    if ( !$ResId ) { next; }
-             $ResId=~/(\d+)\.(\d+)/;
-             my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
-             if ( $CurMap ne 'All Maps' ) {
- 		my ( $ResMap, $NameMap ) = split(/\=/,$CurMap);
- 		if ( $Map ne $ResMap ) { next; }
- 	    }
- 	    my $meta=$hash{'src_'.$ResId};
- 	    my $PartNo = 0;
- 	    $Dis .= ':';
- 	    undef %TempHash;
- 	    map {
- 		if ($_=~/^stores\_(\d+)\_tries$/) {
-                     my $Part=&Apache::lonnet::metadata($meta,$_.'.part');
- 		    if ( $TempHash{"$Part"} eq '' ) {
- 			$TempHash{"$Part"} = $Part;
- 			$TempHash{$PartNo}=$Part;
- 			$TempHash{"$Part.Code"} = 'U';
- 			$PartNo++;
- 		    }
- 		}
-             } split(/\,/,&Apache::lonnet::metadata($meta,'keys'));
-             my $Prob = $Map.'___'.$2.'___'.
-                        &Apache::lonnet::declutter( $hash{'src_'.$ResId} );
-             $Code='U';
-             $Tries = 0;
- 	    $ParCr = 0;
-             $Wrongs = 0;
-   	    $LatestVersion = $result{"version:$Prob"};
- 	    if ( $LatestVersion ) {
- 		for ( my $Version=1; $Version<=$LatestVersion; $Version++ ) {
- 		    my $vkeys = $result{"$Version:keys:$Prob"};
- 		    my @keys = split(/\:/,$vkeys);
- 		    foreach my $Key (@keys) {
- 			if (($Key=~/\.(\w+)\.solved$/) && ($Key!~/^\d+\:/)) {
- 			    my $Part = $1;
- 			    $Tries = $result{"$Version:$Prob:resource.$Part.tries"};
- 			    $ParCr = $result{"$Version:$Prob:resource.$Part.awarded"};
- 			    my $Time = $result{"$Version:$Prob:timestamp"};
- 			    $TempHash{"$Part.Time"} = ($Time) ? $Time : 0;
- 			    $TempHash{"$Part.Tries"} = ($Tries) ? $Tries : 0;
- 			    $TempHash{"$Part.ParCr"} = ($ParCr) ? $ParCr : 0;
- 			    $TotalTries += $TempHash{"$Part.Tries"};
- 			    $TotParCr += $TempHash{"$Part.ParCr"};
- #$r->print($Version.'---'.$Prob.'==='.$Time.'<br>');
- 			    my $Val = $result{"$Version:$Prob:resource.$Part.solved"};
- 			    if ( $Val eq 'correct_by_student' )
-                                { $Wrongs = $Tries - 1; $Code = 'C'; }
- 			    elsif ( $Val eq 'correct_by_override' )
-                                { $Wrongs = $Tries - 1; $Code = 'O'; }
- 			    elsif ( $Val eq 'incorrect_attempted' ||
-                                 $Val eq 'incorrect_by_override' )
- 		               { $Wrongs = $Tries; $Code = 'I'; }
- 			    $TempHash{"$Part.Code"} = $Code;
- 			    $TempHash{"$Part.Wrongs"} = $Wrongs;
- 			}
-      		    }
-                 }
- 		for ( my $n = 0; $n < $PartNo; $n++ ) {
- 		    my $part = $TempHash{$n};
- 		    my $Yes = 0;
-                     if ( $TempHash{$part.'.Code'} eq 'C' ||
-                          $TempHash{$part.'.Code'} eq 'O'  )
- 		       {$ProbSolved++;$Yes=1;}
- 		    my $ptr = "$hash{'title_'.$ResId}";
- 		    if ( $PartNo > 1 ) {
- 			$ptr .= " (part $part)";
- 			$Dis .= ':';
- 		    }
- 		    my $Fac = ($TempHash{"$part.Tries"}) ?
-                               ($TempHash{"$part.ParCr"}/$TempHash{"$part.Tries"}) : 0;
- 		    my $DisF;
- 		    if ( $Fac > 0 &&  $Fac < 1 ) {
- 			$DisF = sprintf( "%.4f", $Fac );
- 		    }
- 		    else {$DisF = $Fac;}
- #		    $DisF .= '+'.$TempHash{"$part.Time"};
- 		    $TimeTot += $TempHash{"$part.Time"};
- 		    $Dis .= $ptr.'*'.$ResId.'='.$DisF.'+'.$Yes;
- 		    $ptr .= "*$ResId:$TempHash{$part.'.Tries'}".
- 		            ":$TempHash{$part.'.Wrongs'}".
-                             ":$TempHash{$part.'.Code'}";
- #$r->print($sname.' -- '.$ptr.'--- timestamp='.$TempHash{"$part.Time"}.'<br>');
- 		    push (@list, $ptr);
- 		    $TotalOpend++;
- 		    $ProbTot++;
- 		}
-             }
- 	    else {
- 		for(my $n=0; $n<$PartNo; $n++) {
- 		    push (@list, "$hash{'title_'.$ResId}*$ResId:0:0:U");
- 		    $ProbTot++;
- 		}
- 	    }
-         }
- 	if ( $TotalTries ) {
- 	    my $DisFac = ( $TotalTries ) ? ($TotParCr/$TotalTries) : 0;
- #	    my $DisFactor = int(sprintf( "%.4f", $DisFac ) * 100);
- 	    my $DisFactor = sprintf( "%.4f", $DisFac );
- 	    my $time;
- 	    if ($ProbSolved){
- 		$time = int(($TimeTot/$ProbSolved)/10000000);
- 	    }
- 	    $DiscFac{($DisFactor.':'.$sname.':'.$ProbTot.':'.$TotalOpend.':'.
-                       $TotalTries.':'.$ProbSolved.':'.$time)}=$Dis;
- #$r->print($DisFactor.$sname.'<br> --- Dis= '.$Dis.'<br>');
- 	}
      }
-     #$r->print($sname.' PrCr= '.$TotParCr.' Slvd= '.$ProbSolved.' Tries='.$TotalTries.'<br>');
  }
- # ------------------------------------------------------------ Build page table
+ #######################################################
- sub tracetable {
+ #######################################################
-     my ($rid,$beenhere)=@_;
-     $rid=~/(\d+)\.(\d+)/;
+ =pod
-     $maps{&Apache::lonnet::declutter($hash{'map_id_'.$1})}='';#$hash{'title_'.$rid};
-     unless ($beenhere=~/\&$rid\&/) {
+ =item &Sequences_with_Assess()
-        $beenhere.=$rid.'&';
-        if (defined($hash{'is_map_'.$rid})) {
+ Returns an array containing the subset of @Sequences which contain
- 	   my $cmap=$hash{'map_type_'.$hash{'map_pc_'.$hash{'src_'.$rid}}};
+ assessments.
-            if ( $cmap eq 'sequence' || $cmap eq 'page' ) {
-                $cols[$#cols+1]=0;
+ =cut
- 	       $HWN++;
-                $mapsort[$HWN]=$rid.$hash{'title_'.$rid};
+ #######################################################
-                #$maps{&Apache::lonnet::declutter($hash{'src_'.$rid})}=
+ #######################################################
-                #      $hash{'title_'.$rid};
+ sub Sequences_with_Assess {
-            }
+     my @Sequences_to_Show;
-            if ((defined($hash{'map_start_'.$hash{'src_'.$rid}})) &&
+     foreach my $map_symb (@SelectedMaps) {
-                (defined($hash{'map_finish_'.$hash{'src_'.$rid}}))) {
+         foreach my $sequence (@Sequences) {
-               my $frid=$hash{'map_finish_'.$hash{'src_'.$rid}};
+             next if ($sequence->{'symb'} ne $map_symb && $map_symb ne 'all');
+             next if ($sequence->{'num_assess'} < 1);
-                 &tracetable($hash{'map_start_'.$hash{'src_'.$rid}},
+             push (@Sequences_to_Show,$sequence);
-                 '&'.$frid.'&');
+         }
-               if ($hash{'src_'.$frid}) {
-                  if ($hash{'src_'.$frid}=~
-                                  /\.(problem|exam|quiz|assess|survey|form)$/) {
- 		     $cols[$#cols+1]=$frid;
- 		     $mapsort[$HWN] .= '&'.$frid;
-                  }
- 	      }
- 	   }
-        } else {
-           if ($hash{'src_'.$rid}) {
-              if ($hash{'src_'.$rid}=~
-                                  /\.(problem|exam|quiz|assess|survey|form)$/) {
- 	         $cols[$#cols+1]=$rid;
- 		 $mapsort[$HWN] .= '&'.$rid;
-              }
-           }
-        }
-        if (defined($hash{'to_'.$rid})) {
-           map {
-               &tracetable($hash{'goesto_'.$_},$beenhere);
-           } split(/\,/,$hash{'to_'.$rid});
-        }
      }
+     return @Sequences_to_Show;
  }
- sub MySort {
+ #######################################################
-     if ( $Pos > 0 && $Pos < 11 ) {
+ #######################################################
- 	if ($ENV{'form.order'} eq 'Descending') {$b <=> $a;}
- 	else { $a <=> $b; }
+ =pod
-     }
-     else {
+ =item &PrepareCourseData($r)
- 	if ($ENV{'form.order'} eq 'Descending') {$b cmp $a;}
- 	else { $a cmp $b; }
+ =cut
+ #######################################################
+ #######################################################
+ sub PrepareCourseData {
+     my ($r) = @_;
+     &clear_sequence_variables();
+     my ($top,$sequences,$assessments) =
+         &Apache::loncoursedata::get_sequence_assessment_data();
+     if (! defined($top) || ! ref($top)) {
+         # There has been an error, better report it
+         &Apache::lonnet::logthis('top is undefined');
+         return;
+     }
+     $top_map = $top if (ref($top));
+     @Sequences = @{$sequences} if (ref($sequences) eq 'ARRAY');
+     @Assessments = @{$assessments} if (ref($assessments) eq 'ARRAY');
+     #
+     # Compute column widths
+     foreach my $seq (@Sequences) {
+         my $name_length = length($seq->{'title'});
+         my $num_parts = $seq->{'num_assess_parts'};
+         #
+         # Use 3 digits for each the sum and total, which means 7 total...
+         my $num_col = $num_parts+7;
+         if ($num_col < $name_length) {
+             $num_col = $name_length;
+         }
+         $seq->{'base_width'} = $name_length;
+         $seq->{'width'} = $num_col;
      }
+     return;
  }
- sub Build_Statistics {
+ #######################################################
-     $r->print(<<ENDPOP);
+ #######################################################
- <script>
-     popwin=open('','popwin','width=400,height=100');
-     popwin.document.writeln('<html><body bgcolor="#8cee8c">'+
-       '<title>LON-CAPA Statistics</title>'+
-       '<h4>Computation Progress</h4>'+
-       '<form name=popremain>'+
-       '<input type=text size=35 name=remaining value=Starting></form>'+
-       '</body></html>');
-     popwin.document.close();
- </script>
- ENDPOP
-     $r->rflush();
+ =pod
- # ---------------------------- Gathering the Data of students' tries
-     my $index;
+ =item &log_sequence($sequence,$recursive,$padding)
-     for ($index=0;$index<=$#students;$index++) {
- #----------- update progress
+ Write data about the sequence to a logfile.  If $recursive is not
-         $r->print('<script>popwin.document.popremain.remaining.value="'.
+ undef the data is written recursively.  $padding is used for recursive
-                   'Computing '.($index+1).'/'.($#students+1).': '.
+ calls.
-                   $students[$index].'";</script>');
-         $r->rflush();
+ =cut
-         &ExtractStudentData($students[$index],$cid);
+ #######################################################
+ #######################################################
+ sub log_sequence {
+     my ($seq,$recursive,$padding) = @_;
+     $padding = '' if (! defined($padding));
+     if (ref($seq) ne 'HASH') {
+         &Apache::lonnet::logthis('log_sequence passed bad sequnce');
+         return;
      }
- #--------------------- close Progress Line
+     &Apache::lonnet::logthis($padding.'sequence '.$seq->{'title'});
-     $r->print('<script>popwin.close()</script>');
+     while (my($key,$value) = each(%$seq)) {
-     $r->rflush();
+         next if ($key eq 'contents');
- # -------------------- sorting the Data
+         if (ref($value) eq 'ARRAY') {
-     @list = sort(@list);
+             for (my $i=0;$i< scalar(@$value);$i++) {
-     $OpSel2='';
+                 &Apache::lonnet::logthis($padding.$key.'['.$i.']='.
-     $OpSel1='selected';
+                                          $value->[$i]);
+             }
-     $p_count = 0;
+         } else {
-     my $nIdx = 0;
+             &Apache::lonnet::logthis($padding.$key.'='.$value);
-     my $dummy;
+         }
-     my $p_val;
+     }
-     my $ResId;
+     if (defined($recursive)) {
-     my $NoElements = $#list + 1;
+         &Apache::lonnet::logthis($padding.'-'x20);
- #-------------------------------- loop for data representation
+         &Apache::lonnet::logthis($padding.'contains:');
-     while ( $nIdx < $NoElements ) {
+         foreach my $item (@{$seq->{'contents'}}) {
-         my %storestats=();
+             if ($item->{'type'} eq 'container') {
- 	my ($Prob,$Tries,$Wrongs,$Code)=split(/\:/,$list[$nIdx]);
+                 &log_sequence($item,$recursive,$padding.'    ');
- 	my $Temp = $Prob;
+             } else {
- 	my $MxTries = 0;
+                 &Apache::lonnet::logthis($padding.'title = '.$item->{'title'});
- 	my $TotalTries = 0;
+                 while (my($key,$value) = each(%$item)) {
- 	my $YES = 0;
+                     next if ($key eq 'title');
- 	my $Incorrect = 0;
+                     if (ref($value) eq 'ARRAY') {
- 	my $Override = 0;
+                         for (my $i=0;$i< scalar(@$value);$i++) {
- 	my $StdNo = 0;
+                             &Apache::lonnet::logthis($padding.$key.'['.$i.']='.
- 	my @StdLst;
+                                                      $value->[$i]);
- 	do {
+                         }
- 	    $nIdx++;
+                     } else {
- 	    $StdNo++;
+                         &Apache::lonnet::logthis($padding.$key.'='.$value);
- 	    $StdLst[ $StdNo ] = $Tries;
+                     }
- 	    $TotalTries += $Tries;
+                 }
- 	    if ( $MxTries < $Tries ) { $MxTries = $Tries; }
+             }
- 	    if ( $Code eq 'C' ){ $YES++; }
+         }
- 	    elsif( $Code eq 'I' ) { $Incorrect++; }
+         &Apache::lonnet::logthis($padding.'end contents of '.$seq->{'title'});
- 	    elsif( $Code eq 'O' ) { $Override++; }
+         &Apache::lonnet::logthis($padding.'-'x20);
- 	    elsif( $Code eq 'U' ) { $StdNo--; }
- 	    ($Prob,$Tries,$Wrongs,$Code)=split(/\:/,$list[$nIdx]);
- 	} while ( $Prob eq $Temp && $nIdx < $NoElements );
- 	$p_count++;
- 	($Temp,$ResId)=split(/\*/,$Temp);
-         $Temp = '<a href="'.$hash{'src_'.$ResId}.'" target="_blank">'.$Temp.'</a>';
- 	my $res = &Apache::lonnet::declutter($hash{'src_'.$ResId});
-         my $urlres=$res;
-         $ResId=~/(\d+)\.(\d+)/;
-         my $Map = &Apache::lonnet::declutter( $hash{'map_id_'.$1} );
-         $urlres=$Map;
-         $res = '<a href="'.$hash{'src_'.$ResId}.'">'.$res.'</a>';
-         #$Map = '<a href="'.$Map.'">'.$res.'</a>';
- #------------------------ Compute the Average of Tries about one problem
- 	my $Average = ($StdNo) ? $TotalTries/$StdNo : 0;
-         $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___timestamp'}=time;
-         $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___stdno'}=$StdNo;
-         $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___avetries'}=$Average;
- #-------------------------------- Compute percentage of Wrong tries
- 	my $Wrong = ( $StdNo ) ? 100 * ( $Incorrect / $StdNo ) : 0;
- #-------------------------------- Compute Standard Deviation
- 	my $StdDev = 0;
- 	if ( $StdNo > 1 ) {
- 	    for ( my $n = 0; $n < $StdNo; $n++ ) {
-                 my $Dif = $StdLst[ $n ]-$Average;
- 		$StdDev += $Dif*$Dif;
- 	    }
- 	    $StdDev /= ( $StdNo - 1 );
- 	    $StdDev = sqrt( $StdDev );
- 	}
- #-------------------------------- Compute Degree of Difficulty
- 	my $DoDiff = 0;
- 	if( $TotalTries > 0 ) {
- 	    $DoDiff = 1 - ( ( $YES + $Override ) / $TotalTries );
- #	    $DoDiff =  ($TotalTries)/($YES + $Override+ 0.1);
- 	}
-         $storestats{$ENV{'request.course.id'}.'___'.$urlres.'___difficulty'}=$DoDiff;
- #-------------------------------- Compute the Skewness
- 	my $Skewness = 0;
-         my $Sum = 0;
- 	if ( $StdNo > 0 && $StdDev > 0 ) {
- 	    for ( my $n = 0; $n < $StdNo; $n++ ) {
-                 my $Dif = $StdLst[ $n ]-$Average;
- 		$Skewness += $Dif*$Dif*$Dif;
- 	    }
- 	    $Skewness /= $StdNo;
- 	    $Skewness /= $StdDev*$StdDev*$StdDev;
- 	}
- #-----------------  Some restition in presenting the float numbers
- 	my $Avg = sprintf( "%.2f", $Average );
- 	my $Wrng = sprintf( "%.1f", $Wrong );
- 	my $SD = sprintf( "%.1f", $StdDev );
- 	my $DoD = sprintf( "%.2f", $DoDiff );
- 	my $Sk = sprintf( "%.1f", $Skewness );
- 	$CachData{($p_count-1)}=$Temp.':'.$StdNo.':'.$TotalTries.':'.
-                                 $MxTries.':'.$Avg.':'.$YES.':'.
-                                 $Override.':'.$Wrng.':'.$SD.':'.
-                                 $Sk.':'.$DoD.':'.$Map.':'.$Prob;
-         $urlres=~/^(\w+)\/(\w+)/;
-         if ($StdNo) {
-            &Apache::lonnet::put('resevaldata',\%storestats,$1,$2);
-         }
- #-------------------------------- Row of statistical table
-         if ( $DiscFlag == 0 ) {
- 	    $r->print( "\n".'<tr>'.
-                "\n".'<td>'.$p_count.'</td>'.
-                "\n".'<td>'.$Temp.'</td>'.
-                "\n".'<td>'.$StdNo.'</td>'.
-                "\n".'<td>'.$TotalTries.'</td>'.
-                "\n".'<td>'.$MxTries.'</td>'.
-                "\n".'<td>'.$Avg.'</td>'.
-                "\n".'<td>'.$YES.'</td>'.
-                "\n".'<td>'.$Override.'</td>'.
-                "\n".'<td>'.$Wrng.'</td>'.
-                "\n".'<td>'.$SD.'</td>'.
-                "\n".'<td>'.$Sk.'</td>'.
-                "\n".'<td>'.$DoD.'</td>'.
-                "\n".'<td>'.$Map.'</td>'.
-                        "\n".'</tr>' );
- 	    $GraphDat{$nIdx}=$DoD.':'.$Wrng;
- 	}
      }
+     return;
  }
+ ##############################################
+ ##############################################
- sub Cache_Statistics {
+ =pod
-     my @list = ();
-     my $Useful;
-     my $UnUseful;
-     my %myHeader = reverse( %Header );
-     $Pos = $myHeader{$ENV{'form.sort'}};
-     $p_count = 0;
-     foreach my $key( keys %CachData) {
- 	my @Temp=split(/\:/,$CachData{$key});
- 	if ( $Pos == 0 || $Pos == 11 ) {
- 	    ($UnUseful,$Useful)=split(/\>/,$Temp[$Pos]);
- 	}
- 	else {
- 	    $Useful = $Temp[$Pos];
- 	}
- 	$list[$p_count]=$Useful.'&'.$CachData{$key};
-         $p_count++;
-     }
-     @list = sort MySort (@list);
-     for ( my $nIdx = 0; $nIdx < $p_count; $nIdx++ ) {
- 	my( $Pre, $Post ) = split(/\&/,$list[$nIdx]);
- 	my ($Temp,$StdNo,$TotalTries,$MxTries,$Avg,$YES,
-             $Override,$Wrng,$SD,$Sk,$DoD,$res,$Prob)=split(/\:/,$Post);
- 	$r->print( "\n".'<tr>'.
-                "\n".'<td>'.($nIdx+1).'</td>'.
-                "\n".'<td  bgcolor="#FFFFFF">'.$Temp.'</td>'.
-                "\n".'<td>'.$StdNo.'</td>'.
-                "\n".'<td>'.$TotalTries.'</td>'.
-                "\n".'<td>'.$MxTries.'</td>'.
-                "\n".'<td>'.$Avg.'</td>'.
-                "\n".'<td>'.$YES.'</td>'.
-                "\n".'<td>'.$Override.'</td>'.
-                "\n".'<td>'.$Wrng.'</td>'.
-                "\n".'<td>'.$SD.'</td>'.
-                "\n".'<td>'.$Sk.'</td>'.
-                "\n".'<td>'.$DoD.'</td>'.
-                "\n".'<td>'.$res.'</td>'.
-                "\n".'</tr>' );
- 	$GraphDat{$nIdx}=$DoD.':'.$Wrng;
-     }
- }
- # ------------------------------------------- Prepare data for Graphical chart
+ =item &StudentDataSelect($elementname,$status,$numvisible,$selected)
- sub GetGraphData {
+ Returns html for a selection box allowing the user to choose one (or more)
-     my $Tag = shift;
+ of the fields of student data available (fullname, username, id, section, etc)
-     my $Col;
-     my $data='';
+ =over 4
-     my $count = 0;
-     my $Max = 0;
+ =item $elementname The name of the HTML form element
-     my $cid=$ENV{'request.course.id'};
-     my $GraphDB = "/home/httpd/perl/tmp/$ENV{'user.name'}".
+ =item $status 'multiple' or 'single' selection box
-                   "_$ENV{'user.domain'}_$cid\_graph.db";
-     foreach (keys %GraphDat) {delete $GraphDat{$_};}
+ =item $numvisible The number of options to be visible
-     if (-e "$GraphDB") {
- 	if (tie(%GraphDat,'GDBM_File',"$GraphDB",&GDBM_READER,0640)) {
+ =back
- 	    if ( $Tag eq 'DoDiff Graph' ) {
- 		$Tag = 'Degree-of-Difficulty';
+ =cut
- 		$Col = 0;
- 	    }
+ ##############################################
- 	    else {
+ ##############################################
- 		$Tag = 'Wrong-Percentage';
+ sub StudentDataSelect {
- 		$Col = 1;
+     my ($elementname,$status,$numvisible)=@_;
- 	    }
+     if ($numvisible < 1) {
- 	    foreach (sort NumericSort keys %GraphDat) {
+         return;
- 		my @Temp=split(/\:/,$GraphDat{$_});
+     }
-                 my $inf = $Temp[$Col];
+     #
- 		if ( $Max < $inf ) {$Max = $inf;}
+     # Build the form element
- 		$data .= $inf.',';
+     my $Str = "\n";
- 		$count++;
+     $Str .= '<select name="'.$elementname.'" ';
- 	    }
+     if ($status ne 'single') {
-             untie(%GraphDat);
+         $Str .= 'multiple="true" ';
- 	    my $Course = $ENV{'course.'.$cid.'.description'};
+     }
- 	    $Course =~ s/\ /"_"/eg;
+     $Str .= 'size="'.$numvisible.'" >'."\n";
- 	    $GData=$Course.'&'.$Tag.'&'.$Max.'&'.$count.'&'.$data;
+     #
+     # Deal with 'all'
- 	}
+     $Str .= '    <option value="all" ';
- 	else {
+     foreach (@SelectedStudentData) {
- 	    $r->print("Unable to tie hash to db file");
+         if ($_ eq 'all') {
- 	}
+             $Str .= 'selected ';
+             last;
+         }
+     }
+     $Str .= ">all</option>\n";
+     #
+     # Loop through the student data fields
+     foreach my $item (@StudentDataOrder) {
+         $Str .= '    <option value="'.$item.'" ';
+         foreach (@SelectedStudentData) {
+             if ($item eq $_ ) {
+                 $Str .= 'selected ';
+                 last;
+             }
+         }
+         $Str .= '>'.$item."</option>\n";
      }
+     $Str .= "</select>\n";
+     return $Str;
  }
+ ##############################################
+ ##############################################
- sub initial {
+ =pod
- # --------------------------------- Initialize the global varaibles
-   undef @students;
-   undef @cols;
-   undef %maps;
-   undef %section;
-   undef %StuBox;
-   undef @list;
-   undef %CachData;
-   undef %GraphDat;
-   undef %DiscFac;
-   undef $CurMap;
-   undef $CurSec;
-   undef $CurStu;
-   undef $p_count;
-   undef $Pos;
-   undef $GData;
- }
+ =item &MapSelect($elementname,$status,$numvisible,$restriction)
- sub ClassList {
+ Returns html for a selection box allowing the user to choose one (or more)
+ of the sequences in the course.  The values of the sequences are the symbs.
+ If the top sequence is selected, the value 'top' will result.
-     &GetStatus();
+ =over 4
-     $cid=$ENV{'request.course.id'};
+ =item $elementname The name of the HTML form element
-     my $chome=$ENV{'course.'.$cid.'.home'};
-     my ($cdom,$cnum)=split(/\_/,$cid);
- # ----------------------- Get first and last resource, see if there is anything
-     $firstres=$hash{'map_start_/res/'.$ENV{'request.course.uri'}};
-     $lastres=$hash{'map_finish_/res/'.$ENV{'request.course.uri'}};
-     if (($firstres) && ($lastres)) {
- # ----------------------------------------------------------------- Render page
- 	my $classlst=&Apache::lonnet::reply
-                  ('dump:'.$cdom.':'.$cnum.':classlist',$chome);
- 	my $StudNo = 0;
- 	unless ($classlst=~/^error\:/) {
- 	    foreach (sort split(/\&/,$classlst)) {
- 		my ($name,$value)=split(/\=/,$_);
- 		my ($end,$start)=split(/\:/,&Apache::lonnet::unescape($value));
- 		$name=&Apache::lonnet::unescape($name);
- 		my ($sname,$sdom)=split(/\:/,$name);
- 		my $ssec=&Apache::lonnet::usection($sdom,$sname,$cid);
-                 if ($ssec==-1) {next;}
- 		$ssec=($ssec) ? $ssec : '(none)';
- 		$ssec=(int($ssec)) ? int($ssec) : $ssec;
- 		#$r->print($sname.'...'.$ssec.'<br>');
- 		$section{$ssec}=$ssec;
- 		if ($CurSec eq 'All Sections' || $ssec eq $CurSec) {
- 		    $students[$StudNo]=$name;
- 		    $StuBox{$sname}=$ssec;
- 		}
- 		$StudNo++;
- 	    }
- 	}
- 	else {
- 	    $r->print('<h1>Could not access course data</h1>');
- 	}
-         $r->print("Total number of students : ".($#students+1));
-         $r->rflush();
- # --------------- Find all assessments and put them into some linear-like order
- 	&tracetable($firstres,'&'.$lastres.'&');
- #my $c=0;
+ =item $status 'multiple' or 'single' selection box
- #foreach(@mapsort) {
- #    $c++;
- #    $r->print('<br>'.$mapsort[$c]);
- #}
- #$r->print('<br> Count = '.$c);
-     }
+ =item $numvisible The number of options to be visible
- # ------------------------------------------------------------- End render page
+ =item $restriction Code reference to subroutine which returns true or
-     else {
+ false.  The code must expect a reference to a sequence data structure.
- 	$r->print('<h3>Undefined course sequence</h3>');
-     }
+ =back
-     &MapSecOptions();
- }
+ =cut
- sub Menu {
+ ##############################################
-     my $InpStr = $ENV{'form.sort'};
+ ##############################################
-     if ( $InpStr eq 'DoDiff Graph' || $InpStr eq '%Wrong Graph' ) {
+ sub MapSelect {
- 	&GetGraphData($InpStr);
+     my ($elementname,$status,$numvisible,$restriction)=@_;
-     	$r->print('<IMG src="/cgi-bin/graph.gif?'.$GData.'" />');
+     if ($numvisible < 1) {
-     }
+         return;
-     else {
+     }
- 	$r->print('<html><head><title>LON-CAPA Statistics</title></head>');
+     #
+     # Set up array of selected items
+     &SetSelectedMaps($elementname);
-         $r->print('<body bgcolor="#FFFFFF">'.
+     #
-                   '<script>window.focus(); window.width=500;window.height=500; </script>'.
+     # Set up the restriction call
-                   '<img align=right src=/adm/lonIcons/lonlogos.gif>');
+     if (! defined($restriction)) {
- # ---------------------------------------------------------------- Course title
+         $restriction = sub { 1; };
-         $r->print('<h1> Course : "'.
-                   $ENV{'course.'.$ENV{'request.course.id'}.
-                   '.description'}.'"</h1><h2>'.localtime().'</h2>');
- # ------------------------------- This is going to take a while, produce output
-         $r->rflush();
- 	$r->print("\n".'<form name=stat method=post action="/adm/statistics" >');
- 	my $content = $ENV{'form.sort'};
- 	if ($content eq '' || $content eq 'Return to Menu') {
- 	    my $Ptr = '<h3>';
- 	    $Ptr .= '<input type=submit name=sort value="Problem Evaluation"/>';#General Statistics"/>';
- 	    $Ptr .= '<br><br>';
- 	    $Ptr .= '<input type=submit name=sort value="Student Assessment"/>';
- 	    $Ptr .= '<br><br>';
- #	    $Ptr .= '<input type=submit name=sort value=Discrimination>';#"Problem Evaluation"/>';
- 	    $Ptr .= '</h3>';
- 	    $r->print( $Ptr );
-       	}
- 	else {
- 	    &initial();
- 	    &ClassList();
- 	    if ( $content eq 'Discrimination' || #'Problem Evaluation' ||
-                  $content eq 'Recalculate Discrimintion Factor' ) {
- 		&CreateDiscFac();
- 	    }
- 	    elsif ( $content eq 'Student Assessment' ||
-                     $content eq 'Create Student Report' ) {
- 		&StudentOptions();
- 		&StudentReport($CurStu,$StuBox{"$CurStu"});
- 	    }
- 	    else {
- 		&PreStatTable();
- 	    }
- 	}
- 	$r->print("\n".'</form>'.
-                   "\n".'</body>'.
-                   "\n".'</html>');
- 	$r->rflush();
      }
+     #
+     # Build the form element
+     my $Str = "\n";
+     $Str .= '<select name="'.$elementname.'" ';
+     if ($status ne 'single') {
+         $Str .= 'multiple="true" ';
+     }
+     $Str .= 'size="'.$numvisible.'" >'."\n";
+     #
+     # Deal with 'all'
+     foreach (@SelectedMaps) {
+         if ($_ eq 'all') {
+             @SelectedMaps = ('all');
+             last;
+         }
+     }
+     #
+     # Put in option for 'all'
+     $Str .= '    <option value="all" ';
+     foreach (@SelectedMaps) {
+         if ($_ eq 'all') {
+             $Str .= 'selected ';
+             last;
+         }
+     }
+     $Str .= ">all</option>\n";
+     #
+     # Loop through the sequences
+     foreach my $seq (@Sequences) {
+         next if (! $restriction->($seq));
+         $Str .= '    <option value="'.$seq->{'symb'}.'" ';
+         foreach (@SelectedMaps) {
+             if ($seq->{'symb'} eq $_) {
+                 $Str .= 'selected ';
+                 last;
+             }
+         }
+         $Str .= '>'.$seq->{'title'}."</option>\n";
+     }
+     $Str .= "</select>\n";
+     return $Str;
  }
- sub StudentOptions {
+ ##############################################
-     my $OpSel5='';
+ ##############################################
-     $CurStu = $ENV{'form.student'};
-     if ( $CurStu eq '' ) {
-         $CurStu = 'All Students';
-         $OpSel5 = 'selected';
-     }
-     my $Ptr ='';
- # ----------------------------------- Loading the Students Combobox
-     $Ptr .= '<br><b>Select Student</b>'."\n".
-        	    '<select name="student">'."\n".
- 	    '<option '.$OpSel5.'>All Students</option>';
-     foreach my $key ( sort keys %StuBox ) {
- 	$Ptr .= '<option';
- 	if ($CurStu eq $key) {$Ptr .= ' selected';}
-         $Ptr .= '>'.$key."</option>\n";
-     }
-     $Ptr .= '</select>';
-     $Ptr .= '<br><input type="submit" name="sort" value="Create Student Report" />';
-     $r->print( $Ptr );
-     $r->rflush();
- }
- sub GetStatus {
+ =pod
-     $OpSelDis1='';
+ =item &SectionSelect($elementname,$status,$numvisible)
-     $OpSelDis2='';
-     $OpSel1='';
+ Returns html for a selection box allowing the user to choose one (or more)
-     $OpSel2='';
+ of the sections in the course.
-     $OpSel3='';
-     $OpSel4='';
+ Uses the package variables @Sections and @SelectedSections
+ =over 4
- #    if ( $ENV{'form.DisType'} eq 'Total Number of Correct Answers' ) {
- #	$OpSelDis1='selected';
+ =item $elementname The name of the HTML form element
- #	$CurDis=0;
- #    }
- #    else { $OpSel2 = 'selected'; $CurDis = 1;}
-     if ( $ENV{'form.order'} eq 'Descending' ) { $OpSel2='selected'; }
+ =item $status 'multiple' or 'single' selection box
-     else { $OpSel1 = 'selected'; }
-     $CurMap = $ENV{'form.maps'};
+ =item $numvisible The number of options to be visible
-     if ( $CurMap eq '' ) {
- 	$CurMap = 'All Maps';
+ =back
- 	$OpSel3 = 'selected';
-     }
+ =cut
-     $CurSec = $ENV{'form.section'};
-     if ( $CurSec eq '' ) {
+ ##############################################
- 	$CurSec = 'All Sections';
+ ##############################################
-         $OpSel4 = 'selected';
+ sub SectionSelect {
+     my ($elementname,$status,$numvisible)=@_;
+     if ($numvisible < 1) {
+         return;
+     }
+     #
+     # Make sure we have the data we need to continue
+     if (! @Sections) {
+         &PrepareClasslist()
+     }
+     #
+     # Build the form element
+     my $Str = "\n";
+     $Str .= '<select name="'.$elementname.'" ';
+     if ($status ne 'single') {
+         $Str .= 'multiple="true" ';
      }
+     $Str .= 'size="'.$numvisible.'" >'."\n";
+     #
+     # Loop through the sequences
+     foreach my $s (@Sections) {
+         $Str .= '    <option value="'.$s.'" ';
+         foreach (@SelectedSections) {
+             if ($s eq $_) {
+                 $Str .= 'selected ';
+                 last;
+             }
+         }
+         $Str .= '>'.$s."</option>\n";
+     }
+     $Str .= "</select>\n";
+     return $Str;
  }
+ #######################################################
+ #######################################################
- sub MapSecOptions {
+ =pod
- # ----------------------------------- Loading the Maps Combobox
-     my $Ptr = '<br>';
+ =item &CreateAndParseOutputSelector()
-     $Ptr .= '<br><input type="submit" name="sort" value="Return to Menu" />';
-     $Ptr .= '<br><b> Select &nbsp; Map &nbsp; &nbsp; </b>'."\n".
+ Construct a selection list of options for output and parse output selections.
-        	    '<select name="maps">'."\n".
- 	    '<option '.$OpSel3.'>All Maps</option>';
+ =cut
-     foreach my $key ( sort keys %maps ) {
- 	$Ptr .= '<option';
+ #######################################################
-         if ($CurMap eq $key) {$Ptr .= ' selected';}
+ #######################################################
- 	$Ptr .= '>'.$key."</option>\n";
+ sub OutputDescriptions {
-     }
+     my (@OutputOptions) = @_;
-     $Ptr .= '</select>';
+     my $Str = '';
-     $Ptr .= '&nbsp;&nbsp;&nbsp;';
+     $Str .= "<h2>Output Modes</h2>\n";
+     $Str .= "<dl>\n";
- # ----------------------------------- Loading the Sections Combobox
+     foreach my $outputmode (@OutputOptions) {
-     $Ptr .= '<br><b>Select Section</b>'."\n".
+ 	$Str .="    <dt>".$outputmode->{'name'}."</dt>\n";
-        	    '<select name="section">'."\n".
+ 	$Str .="        <dd>".$outputmode->{'description'}."</dd>\n";
- 	    '<option '.$OpSel4.'>All Sections</option>';
+     }
-     foreach my $key ( sort keys %section ) {
+     $Str .= "</dl>\n";
- 	$Ptr .= '<option';
+     return $Str;
-         if ($CurSec eq $key) {$Ptr .= ' selected';}
+ }
- 	$Ptr .= '>'.$key."</option>"."\n";
+ sub CreateAndParseOutputSelector {
+     my ($elementname,$default,@OutputOptions) = @_;
+     my $output_mode;
+     my $show;
+     my $Str = '';
+     #
+     # Format for output options is 'mode, restrictions';
+     my $selected = $default;
+     if (exists($ENV{'form.'.$elementname})) {
+         if (ref($ENV{'form.'.$elementname} eq 'ARRAY')) {
+             $selected = $ENV{'form.'.$elementname}->[0];
+         } else {
+             $selected = $ENV{'form.'.$elementname};
+         }
      }
-     $Ptr .= '</select>'."\n";
+     #
+     # Set package variables describing output mode
-     $r->print( $Ptr );
+     $output_mode = 'html';
+     $show        = 'all';
+     foreach my $option (@OutputOptions) {
+         next if ($option->{'value'} ne $selected);
+         $output_mode = $option->{'mode'};
+         $show        = $option->{'show'};
+     }
+     #
+     # Build the form element
+     $Str = qq/<select size="5" name="$elementname">/;
+     foreach my $option (@OutputOptions) {
+         if (exists($option->{'special'}) &&
+             $option->{'special'} =~ /do not show/) {
+             next;
+         }
+         $Str .= "\n".'    <option value="'.$option->{'value'}.'"';
+         $Str .= " selected " if ($option->{'value'} eq $selected);
+         $Str .= ">".$option->{'name'}."<\/option>";
+     }
+     $Str .= "\n</select>";
+     return ($Str,$output_mode,$show);
+ }
+ ###############################################
+ ###############################################
+ =pod
+ =item &Gather_Student_Data()
+ Ensures all student data is up to date.
+ =cut
+ ###############################################
+ ###############################################
+ sub Gather_Student_Data {
+     my ($r) = @_;
+     my $c = $r->connection();
+     #
+     my @Sequences = &Apache::lonstatistics::Sequences_with_Assess();
+     #
+     my @Students = @Apache::lonstatistics::Students;
+     #
+     # Open the progress window
+     my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
+         ($r,'Statistics Compilation Status',
+          'Statistics Compilation Progress', scalar(@Students));
+     #
+     while (my $student = shift @Students) {
+         return if ($c->aborted());
+         my ($status,undef) = &Apache::loncoursedata::ensure_current_data
+             ($student->{'username'},$student->{'domain'},
+              $ENV{'request.course.id'});
+         &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
+                                                  'last student');
+     }
+     &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
      $r->rflush();
  }
+ ##################################################
+ ##################################################
+ sub DisplayClasslist {
+     my ($r)=@_;
+     #
+     my @Fields = ('fullname','username','domain','id','section');
+     #
+     my $Str='';
+     if (! @Students) {
+         if ($SelectedSections[0] eq 'all') {
+             if (lc($ENV{'form.Status'}) eq 'any') {
+                 $Str .= '<h2>There are no students in the course.</h2>';
+             } elsif (lc($ENV{'form.Status'}) eq 'active') {
+                 $Str .= '<h2>There are no currently enrolled students in '.
+                     'the course.</h2>';
+             } elsif (lc($ENV{'form.Status'}) eq 'expired') {
+                 $Str .= '<h2>There are no previously enrolled '.
+                     'students in the course.</h2>';
+             }
+         } else {
+             my $sections;
+             if (@SelectedSections == 1) {
+                 $sections = 'section '.$SelectedSections[0];
+             } elsif (@SelectedSections > 2) {
+                 $sections = 'sections '.join(', ',@SelectedSections);
+                 $sections =~ s/, ([^,])*$/, and $1/;
+             } else {
+                 $sections = 'sections '.join(' and ',@SelectedSections);
+             }
+             if (lc($ENV{'form.Status'}) eq 'any') {
+                 $Str .= '<h2>There are no students in '.$sections.'.</h2>';
+             } elsif (lc($ENV{'form.Status'}) eq 'active') {
+                 $Str .= '<h2>There are no currently enrolled students '.
+                     'in '.$sections.'.</h2>';
+             } elsif (lc($ENV{'form.Status'}) eq 'expired') {
+                 $Str .= '<h2>There are no previously enrolled students '.
+                     'in '.$sections.'.</h2>';
+             }
+         }
+         $Str.= '<a href="/adm/statistics?reportSelected=student_assessment">'.
+             'Return to the chart.</a>';
+         $r->print($Str);
+         $r->rflush();
+         return;
+     }
- # ================================================================ Main Handler
+     # "Click" is asinine but it is probably not my place to change the world.
+     $Str .= '<h2>Click on a students name or username to view their chart</h2>';
+     $Str .= '<table border="0"><tr><td bgcolor="#777777">'."\n";
+     $Str .= '<table border="0" cellpadding="3"><tr bgcolor="#e6ffff">'."\n";
+     foreach my $field (@Fields) {
+         $Str .= '<th><a href="/adm/statistics?reportSelected=classlist&sort='.$field.'">'.$field.
+             '</a></th>';
+     }
+     $Str .= '</tr>'."\n";
+     #
+     my $alternate = 0;
+     foreach my $student (@Students) { # @Students is a package variable
+         my $sname = $student->{'username'}.':'.$student->{'domain'};
+         if($alternate) {
+             $Str .= '<tr bgcolor="#ffffe6">';
+         } else {
+             $Str .= '<tr bgcolor="#ffffc6">';
+         }
+         $alternate = ($alternate + 1) % 2;
+         #
+         foreach my $field (@Fields) {
+             $Str .= '<td>';
+             if ($field eq 'fullname' || $field eq 'username') {
+                 $Str .= '<a href="/adm/statistics?reportSelected=';
+                 $Str .= &Apache::lonnet::escape('student_assessment');
+                 $Str .= '&sort='.&Apache::lonnet::escape($ENV{'form.sort'});
+                 $Str .= '&SelectedStudent=';
+                 $Str .= &Apache::lonnet::escape($sname).'">';
+                 $Str .= $student->{$field}.'&nbsp';
+                 $Str .= '</a>';
+             } else {
+                 $Str .= $student->{$field};
+             }
+             $Str .= '</td>';
+         }
+         $Str .= "</tr>\n";
+     }
+     $Str .= '</table></td></tr></table>'."\n";
+     #
+     $r->print($Str);
+     $r->rflush();
+     #
+     return;
+ }
- sub handler {
+ ##############################################
-     $r=shift;
+ ##############################################
+ sub CreateMainMenu {
+     my ($status,$reports,$current)=@_;
+     #
+     my $Str = '';
+     #
+     $Str  = '<input type="hidden" name="reportSelected" value="'.$current.'">';
+ #    $Str .= '<table border="0"><tbody><tr>'."\n";
+ #    $Str .= '<td align="center"><b>Report:</b></td>'."\n";
+ #    $Str .= '<td align="center">';
+ #    $Str .= '<select name="reportSelected" '.
+ #        'onchange="document.Statistics.submit()">'."\n";
+ #    foreach (sort(keys(%$reports))) {
+ #        $Str .= '<option value="'.$_.'"';
+ #        if($current eq $_) {
+ #            $Str .= ' selected';
+ #        }
+ #        $Str .= '>'.$reports->{$_}.'</option>'."\n";
+ #    }
+ #    $Str .= '</select></td>'."\n";
+ #    #
+ #    $Str .= '<td>'.('&nbsp;'x30).'</td>';
+ #    $Str .= '<td align="center">'.
+ #        '<input type="submit" name="ClearCache" value="Clear Caches" />'.
+ #            "</td>\n";
+ #    $Str .= '</tr></tbody></table>'."\n";
+ #    $Str .= '<hr>'."\n";
+     #
+     return $Str;
+ }
-     if (&Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
+ ##############################################
- # ------------------------------------------- Set document type for header only
+ ##############################################
- 	if ($r->header_only) {
+ sub handler {
- 	    if ($ENV{'browser.mathml'}) {
+     my $r=shift;
- 		$r->content_type('text/xml');
+     my $c = $r->connection();
- 	    }
+     #
- 	    else {
+     # Check for overloading
- 		$r->content_type('text/html');
+     my $loaderror=&Apache::lonnet::overloaderror($r);
- 	    }
+     if ($loaderror) { return $loaderror; }
- 	    $r->send_http_header;
+     $loaderror=
- 	    return OK;
+        &Apache::lonnet::overloaderror($r,
- 	}
+          $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
- 	my $requrl=$r->uri;
+     if ($loaderror) { return $loaderror; }
- # ----------------------------------------------------------------- Tie db file
+     #
+     # Check for access
- 	undef %hash;
+     if (! &Apache::lonnet::allowed('vgr',$ENV{'request.course.id'})) {
- 	if ($ENV{'request.course.fn'}) {
- 	    my $fn=$ENV{'request.course.fn'};
- 	    if (-e "$fn.db") {
- 		if (tie(%hash,'GDBM_File',"$fn.db",&GDBM_READER,0640)) {
- # ------------------------------------------------------------------- Hash tied
- 		    $r->content_type('text/html');
- 		    $r->send_http_header;
- 		    &Menu();
- 		}
- 		else {
- 		    $r->content_type('text/html');
- 		    $r->send_http_header;
- 		    $r->print('<html><body>Coursemap undefined.</body></html>');
- 		}
- # ------------------------------------------------------------------ Untie hash
- 		unless (untie(%hash)) {
- 		    &Apache::lonnet::logthis("<font color=blue>WARNING: ".
-                             "Could not untie coursemap $fn (browse).</font>");
- 		}
- # -------------------------------------------------------------------- All done
- 		return OK;
- # ----------------------------------------------- Errors, hash could no be tied
- 	    }
- 	}
- 	else {
- 	    $ENV{'user.error.msg'}="$requrl:bre:0:0:Course not initialized";
- 	    return HTTP_NOT_ACCEPTABLE;
- 	}
-     }
-     else {
          $ENV{'user.error.msg'}=
-         $r->uri.":vgr:0:0:Cannot view grades for complete course";
+             $r->uri.":vgr:0:0:Cannot view grades for complete course";
+         if (! &Apache::lonnet::allowed('vgr',
-         return HTTP_NOT_ACCEPTABLE;
+                       $ENV{'request.course.id'}.'/'.$ENV{'request.course.sec'})) {
+             $ENV{'user.error.msg'}=
+                 $r->uri.":vgr:0:0:Cannot view grades with given role";
+             return HTTP_NOT_ACCEPTABLE;
+         }
      }
+     #
+     # Set document type for header only
+     if($r->header_only) {
+         if ($ENV{'browser.mathml'}) {
+             $r->content_type('text/xml');
+         } else {
+             $r->content_type('text/html');
+         }
+         &Apache::loncommon::no_cache($r);
+         $r->send_http_header;
+         return OK;
+     }
+     #
+     # Send the header
+     $r->content_type('text/html');
+     $r->send_http_header;
+     #
+     # Extract form elements from query string
+     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
+                                             ['sort','reportSelected',
+                                              'SelectedStudent']);
+     if (! exists($ENV{'form.reportSelected'})) {
+         $ENV{'form.reportSelected'} = 'student_assessment';
+     }
+     #
+     # Give the LON-CAPA page header
+     $r->print(&Apache::lonhtmlcommon::Title('Course Statistics and Charts'));
+     $r->rflush();
+     #
+     if (! &Apache::lonmysql::verify_sql_connection()) {
+         my $serveradmin = $r->dir_config('lonAdmEMail');
+         $r->print(<<END);
+ <h2><font color="Red">Unable to connect to database!</font></h2>
+ <p>
+ Please notify the server administrator <b>$serveradmin</b>.
+ </p><p>
+ Course Statistics and Charts cannot be retrieved until the database is
+ restarted.  Your data is intact but cannot be displayed at this time.
+ </p>
+ </body>
+ </html>
+ END
+         return;
+     }
+     #
+     # Clean out the caches
+     if (exists($ENV{'form.ClearCache'})) {
+         &Apache::loncoursedata::delete_caches($ENV{'requres.course.id'});
+     }
+     #
+     # Set up the statistics and chart environment
+     &PrepareClasslist();
+     &PrepareCourseData($r);
+     #
+     # Begin form output
+     $r->print('<form name="Statistics" ');
+     $r->print('method="post" action="/adm/statistics">');
+     #
+     # Print main menu
+     my %reports = ('classlist'          => 'Class list',
+                    'problem_statistics' => 'Problem Statistics',
+                    'student_assessment' => 'Problem Status Chart',
+ #                   'percentage'         => 'Correct-problems Plot',
+ #                   'option_response'    => 'Option Response Analysis',
+ #                   'activitylog'        => 'Activity Log',
+                    );
+     $r->print(&CreateMainMenu($ENV{'form.status'},
+                               \%reports,$ENV{'form.reportSelected'}));
+     $r->rflush();
+     #
+     my $GoToPage = $ENV{'form.reportSelected'};
+     if($GoToPage eq 'activitylog') {
+ #        &Apache::lonproblemstatistics::Activity();
+     } elsif($GoToPage eq 'problem_statistics') {
+         &Apache::lonproblemstatistics::BuildProblemStatisticsPage($r,$c);
+     } elsif($GoToPage eq 'option_response') {
+ #        &Apache::lonproblemanalysis::BuildProblemAnalysisPage($r,$c);
+     } elsif($GoToPage eq 'student_assessment') {
+         &Apache::lonstudentassessment::BuildStudentAssessmentPage($r,$c);
+     } elsif($GoToPage eq 'DoDiffGraph' || $GoToPage eq 'PercentWrongGraph') {
+ #        &Apache::lonproblemstatistics::BuildGraphicChart($r,$c);
+     } elsif($GoToPage eq 'Correct-problems Plot') {
+ #	&Apache::lonpercentage::BuildPercentageGraph($r,$c);
+     }
+     #
+     $r->print("</form>\n");
+     $r->print("</body>\n</html>\n");
+     $r->rflush();
+     #
+     return OK;
  }
 ;
- __END__
+ #######################################################
+ #######################################################
+ =pod
+ =back
+ =cut
+ #######################################################
+ #######################################################
+ __END__

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>

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	Added in v.1.80