--- loncom/homework/default_homework.lcpm 2000/11/21 18:36:37 1.10 +++ loncom/homework/default_homework.lcpm 2014/06/16 16:52:50 1.164 @@ -1,159 +1,1380 @@ -# file name (temp): default_homework +# The LearningOnline Network with CAPA # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run() -# # -$RANDOMINIT=0; +# $Id: default_homework.lcpm,v 1.164 2014/06/16 16:52:50 bisitz Exp $ +# +# Copyright Michigan State University Board of Trustees +# +# This file is part of the LearningOnline Network with CAPA (LON-CAPA). +# +# LON-CAPA is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# LON-CAPA is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with LON-CAPA; if not, write to the Free Software +# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +# +# /home/httpd/html/adm/gpl.txt +# +# http://www.lon-capa.org/ +# +# + +#init some globals +$hidden::RANDOMINIT=0; +$pi=atan2(1,1)*4; +$rad2deg=180.0/$pi; +$deg2rad=$pi/180.0; +$"=' '; +use strict; +{ + my $n = 0; + my $total = 0; + my $num_left = 0; + my @order; + my $type; + + sub init_permutation { + my ($size,$requested_type) = @_; + @order = (0..$size-1); + $n = $size; + $type = $requested_type; + if ($type eq 'ordered') { + $total = $num_left = 1; + } elsif ($type eq 'unordered') { + $total = $num_left = &factorial($size); + } else { + die("Unkown type: $type"); + } + } + + sub get_next_permutation { + if ($num_left == $total) { + $num_left--; + return \@order; + } + + # Find largest index j with a[j] < a[j+1] + + my $j = scalar(@order) - 2; + while ($order[$j] > $order[$j+1]) { + $j--; + } + + # Find index k such that a[k] is smallest integer + # greater than a[j] to the right of a[j] + + my $k = scalar(@order) - 1; + while ($order[$j] > $order[$k]) { + $k--; + } + + # Interchange a[j] and a[k] + + @order[($k,$j)] = @order[($j,$k)]; + + # Put tail end of permutation after jth position in increasing order + + my $r = scalar(@order) - 1; + my $s = $j + 1; + + while ($r > $s) { + @order[($s,$r)]=@order[($r,$s)]; + $r--; + $s++; + } + + $num_left--; + return(\@order); + } + + sub get_permutations_left { + return $num_left; + } +} + +sub check_commas { + my ($response)=@_; + #print("$response "); + my @numbers=split(',',$response); + #print(" numbers ".join('-',@numbers)." "); + if (scalar(@numbers) > 1) { + #print(" numbers[0] ".$numbers[0]." "); + if (length($numbers[0]) > 3 || length($numbers[0]) == 0) { return -1; } + shift(@numbers); + #print(" numbers ".scalar(@numbers)." "); + while (scalar(@numbers) > 1) { + #print(" numbers ".join('-',@numbers)." "); + if (length($numbers[0]) != 3) { return -2; } + shift(@numbers); + } + my ($number)=split('\.',$numbers[0]); + #print(" number ".$number." "); + #print(" numbers[0] ".$numbers[0]." "); + if (length($number) != 3) { return -3; } + } else { + my ($number)=split('\.',$numbers[0]); + if (length($number) > 3) { return -4; } + } + return 1; +} + sub caparesponse_check { - my $answer=''; #done - my $type=''; #done - my $tol_type=''; # gets it's value from whether tol has a % or not done - my $tol=''; #done - my $sig_lbound=''; - my $sig_ubound=''; - my $ans_fmt=''; - my $units=''; - my $calc=''; - my ($response,$expr)=@_; - - ($answer,$type,$tol,$sig_lbound,$sig_ubound,$ans_fmt, - $units,$calc) = eval $expr.'return $answer,$type,$tol,$sig_lbound,$sig_ubound,$ans_fmt,$units,$calc'; - - #type's definitons come from capaParser.h - if ($type eq '' ) { - if ( $answer eq ($answer *1.0)) { $type = 2; - } else { $type = 3; } - } else { - if ($type eq 'cs') { $type = 4; - } elsif ($type eq 'ci') { $type = 3; - } elsif ($type eq 'mc') { $type = 5; - } elsif ($type eq 'fml') { $type = 8; - } elsif ($type eq 'subj') { $type = 7; - } else { return "ERROR: Unknown type of answer: $type" } - } - - if ($tol eq '') { - $tol=0.0; - $tol_type=1; #TOL_ABSOLUTE - } else { - if ($tol =~ /%$/) { - $tol=chop($tol); - $tol_type=2; #TOL_PERCENTAGE - } else { - $tol_type=1; #TOL_ABSOLUTE - } - } - my $result = &caparesponse_capa_check_answer($response,$answer,$type, - $tol_type,$tol, - $sig_lbound,$sig_ubound, - $ans_fmt, $units,$calc); - - if ($result == '1') { $result='EXACT_ANS'; } - elsif ($result == '2') { $result='APPROX_ANS'; } - elsif ($result == '3') { $result='SIG_FAIL'; } - elsif ($result == '4') { $result='UNIT_FAIL'; } - elsif ($result == '5') { $result='NO_UNIT'; } - elsif ($result == '6') { $result='UNIT_OK'; } - elsif ($result == '7') { $result='INCORRECT'; } - elsif ($result == '8') { $result='UNIT_NOTNEEDED'; } - elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; } - elsif ($result =='10') { $result='SUB_RECORDED'; } - elsif ($result =='11') { $result='BAD_FORMULA'; } - elsif ($result =='12') { $result='WANTED_NUMERIC'; } - else {$result = "ERROR: Unknown Result: $result";} + my ($answer,$response)=@_; + #not properly used yet: calc + #not to be used: $ans_fmt + my $type=$LONCAPA::CAPAresponse_args{'type'}; + my $tol=$LONCAPA::CAPAresponse_args{'tol'}; + my $sig=$LONCAPA::CAPAresponse_args{'sig'}; + my $ans_fmt=$LONCAPA::CAPAresponse_args{'format'}; + my $unit=$LONCAPA::CAPAresponse_args{'unit'}; + my $calc=$LONCAPA::CAPAresponse_args{'calc'}; + my $samples=$LONCAPA::CAPAresponse_args{'samples'}; + + my $tol_type=''; # gets it's value from whether tol has a % or not done + my $sig_lbound=''; #done + my $sig_ubound=''; #done + + #type's definitons come from capaParser.h + + #remove leading and trailing whitespace + if (!defined($response)) { + $response=''; + } + if ($response=~ /^\s|\s$/) { + $response=~ s:^\s+|\s+$::g; + } + + if ($type eq 'cs' || $type eq 'ci') { + #for string answers make sure all places spaces occur, there is + #really only 1 space, in both the answer and the response + $answer=~s/ +/ /g; + $response=~s/ +/ /g; + } elsif ($type eq 'mc') { + $answer=~s/[\s,]//g; + $response=~s/[\s,]//g; + } + if ($type eq 'float' && $unit=~/\$/) { + if ($response!~/^\$|\$$/) { return ('NO_UNIT', undef); } + $response=~s/\$//g; + } + if ($type eq 'float' && $unit=~/\,/ && (&check_commas($response)<0)) { + return "COMMA_FAIL:"; + } + $ans_fmt=~s/\W//g; + $unit=~s/[\$,]//g; + if ($type eq 'float') { $response=~s/,//g; } + + if (length($response) > 500) { return ('TOO_LONG',undef); } + + if ($type eq '' ) { + if ( $answer eq ($answer *1.0)) { $type = 2; + } else { $type = 3; } + } else { + if ($type eq 'cs') { $type = 4; } + elsif ($type eq 'ci') { $type = 3 } + elsif ($type eq 'mc') { $type = 5; } + elsif ($type eq 'fml') { $type = 8; } + elsif ($type eq 'math') { $type = 9; } + elsif ($type eq 'subj') { $type = 7; } + elsif ($type eq 'float') { $type = 2; } + elsif ($type eq 'int') { $type = 1; } + else { return ('ERROR', "Unknown type of answer: $type") } + } + + my $points; + my $id_list; + #formula type setup the sample points + if ($type eq '8') { + ($id_list,$points)=split(/@/,$samples); + } + if ($tol eq '') { + $tol=0.0; + $tol_type=1; #TOL_ABSOLUTE + } else { + if ($tol =~ /%$/) { + chop $tol; + $tol_type=2; #TOL_PERCENTAGE + } else { + $tol_type=1; #TOL_ABSOLUTE + } + } + + ($sig_ubound,$sig_lbound)=&LONCAPA_INTERNAL_get_sigrange($sig); + + my $reterror=""; + my $result; + if (($type eq '9') || ($type eq '8')) { + if ($response=~/\=/) { + return ('BAD_FORMULA','Please submit just an expression, not an equation.'); + } elsif ($response =~ /\,/ and $response !~ /^\s*\{.*\}\s*$/) { + return ('BAD_FORMULA'); + } + } + if ($type eq '9') { + $result = &maxima_check(&maxima_cas_formula_fix($response),&maxima_cas_formula_fix($answer),\$reterror); + } else { + if ($type eq '8') { # fml type + $response = &capa_formula_fix($response); + $answer = &capa_formula_fix($answer); + } + $result = &caparesponse_capa_check_answer($response,$answer,$type, + $tol_type,$tol, + $sig_lbound,$sig_ubound, + $ans_fmt,$unit,$calc,$id_list, + $points,$external::randomseed, + \$reterror); + } + if ($result == '1') { $result='EXACT_ANS'; } + elsif ($result == '2') { $result='APPROX_ANS'; } + elsif ($result == '3') { $result='SIG_FAIL'; } + elsif ($result == '4') { $result='UNIT_FAIL'; } + elsif ($result == '5') { $result='NO_UNIT'; } + elsif ($result == '6') { $result='UNIT_OK'; } + elsif ($result == '7') { $result='INCORRECT'; } + elsif ($result == '8') { $result='UNIT_NOTNEEDED'; } + elsif ($result == '9') { $result='ANS_CNT_NOT_MATCH'; } + elsif ($result =='10') { $result='SUB_RECORDED'; } + elsif ($result =='11') { $result='BAD_FORMULA'; } + elsif ($result =='12' && !$response) { $result='MISSING_ANSWER'; } + elsif ($result =='12') { $result='WANTED_NUMERIC'; } + elsif ($result =='13') { $result='UNIT_INVALID_INSTRUCTOR'; } + elsif ($result =='141') { $result='UNIT_INVALID_STUDENT'; } + elsif ($result =='142') { $result='UNIT_INVALID_STUDENT'; } + elsif ($result =='143') { $result='UNIT_INVALID_STUDENT'; } + elsif ($result =='15') { $result='UNIT_IRRECONCIBLE'; } + else {$result = "ERROR: Unknown Result:$result:$@:";} + + return ($result,$reterror); +} + + +sub caparesponse_check_list { + my $responses=$LONCAPA::CAPAresponse_args{'response'}; + &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args)); + my $type = $LONCAPA::CAPAresponse_args{'type'}; + my $answerunit=$LONCAPA::CAPAresponse_args{'unit'}; + &LONCAPA_INTERNAL_DEBUG("Got type :$type: answer unit :$answerunit:\n"); + + my $preprocess=$LONCAPA::CAPAresponse_args{'preprocess'}; + $preprocess=~s/^\&//; + + my $num_input_lines = + scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}}); + + if ($type ne '' ) { + if (scalar(@$responses) < $num_input_lines) { + return 'MISSING_ANSWER'; + } + if (scalar(@$responses) > $num_input_lines) { + return 'EXTRA_ANSWER'; + } + + } + + foreach my $which (0..($num_input_lines-1)) { + my $answer_size = + scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}[$which]}); + if ($type ne '' + && $answer_size > 1) { + $responses->[$which]=[split(/,/,$responses->[$which])]; + } else { + $responses->[$which]=[$responses->[$which]]; + } + } + foreach my $which (0..($num_input_lines-1)) { + my $answer_size = + scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}[$which]}); + my $response_size = + scalar(@{$responses->[$which]}); + if ($answer_size > $response_size) { + return 'MISSING_ANSWER'; + } + if ($answer_size < $response_size) { + return 'EXTRA_ANSWER'; + } + } - return "$result:$tol:$tol_type"; + my $unit; + my ($allowalgebra)=($LONCAPA::CAPAresponse_args{'allowalgebra'}=~/^(yes|1|on)$/i); + if ($type eq 'float' || $type eq '') { + #for numerical problems split off the unit + my $part1; + my $part2; + if ($allowalgebra) { + ($part1,$part2)=($responses->[0][-1]=~ /^(.*[^\s])\s+([^\s]+)$/); + } else { + ($part1,$part2)=($responses->[0][-1]=~ /^([\d\.\,\s\$]*(?:(?:[xX\*]10[\^\*]*|[eE]*)[\+\-]*\d*)*(?:^|\S)\d+)([\$\s\w\^\*\/\(\)\+\-]*[^\d\.\s\,][\$\s\w\^\*\/\(\)\+\-]*)$/); + } + if (defined($part1) && defined($part2)) { + $responses->[0][-1]=$part1; + $unit=&capa_formula_fix($part2); + my $customunits=$LONCAPA::CAPAresponse_args{'customunits'}; + if ($customunits =~ /\S/) { + foreach my $replacement (split(/\s*\,\s*/,$customunits)) { + my ($which,$what)=split(/\s*\=\s*/,$replacement); + if ((defined($which)) && (defined($what))) { + $what=&capa_formula_fix($what); + $unit=~s/$which/\($what\)/g; + } + } + } + } + } + $unit=~s/\s//; + my $error; + foreach my $response (@$responses) { + foreach my $element (@$response) { + # See if we have preprocessor + if ($preprocess=~/\S/) { + if (defined(&$preprocess)) { + no strict 'refs'; + $element=&$preprocess($element,$unit); + use strict 'refs'; + } + } + if (($type eq 'float') || (($type eq '') && ($unit ne ''))) { + $element =~ s/\s//g; + } + my $appendunit=$unit; +# Deal with percentages +# unit is unit entered by student, answerunit is unit by author +# Deprecated: divide answer by 100 if student entered percent, +# but author did not. Too much confusion +# if (($unit=~/\%/) && ($answerunit ne '%')) { +# $element=$element/100; +# $appendunit=~s/\%//; +# } +# Author entered percent, student did not + if (($unit!~/\%/) && ($answerunit=~/\%/)) { + $element=$element*100; + $appendunit='%'.$appendunit; + } +# Zero does not need a dimension + if (($element =~ /^[0\.]+$/) && ($unit!~/\w/) && ($answerunit=~/\w/)) { + $appendunit=$answerunit; + } +# Do the math for the student if allowed + if ($allowalgebra) { + $element=&cas('maxima',$element); + } + if ($appendunit ne '') { + $element .= " $appendunit"; + } + &LONCAPA_INTERNAL_DEBUG("Made response element :$element:"); + } + } + + foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) { + if (!defined($thisanswer)) { + return ('ERROR','answer was undefined'); + } + } + + my $allow_control_char = 0; + my $control_chars_removed = 0; + my $ansstring; + if ($type eq 'cs' || $type eq 'ci') { + if (ref($LONCAPA::CAPAresponse_answer->{'answers'}) eq 'ARRAY') { + foreach my $strans (@{$LONCAPA::CAPAresponse_answer->{'answers'}}) { + if (ref($strans) eq 'ARRAY') { + $ansstring = join("\0",@{$strans}); + foreach my $item (@{$strans}) { + if ($item =~ /[\000-\037]/) { + $allow_control_char = 1; + } + } + } + } + } + } + +# &LONCAPA_INTERNAL_DEBUG(&LONCAPA_INTERNAL_Dumper($responses)); + my %memoized; + if ($LONCAPA::CAPAresponse_answer->{'type'} eq 'ordered') { + for (my $i=0; $i{'answers'}[$i]; + my $response = $responses->[$i]; + my $key = "$answer\0$response"; + my (@awards,@msgs); + for (my $j=0; $j[$j] =~ /[\000-\037]/) { + $response->[$j] =~ s/[\000-\037]//g; + $control_chars_removed = 1; + } + } + } + # See if we have preprocessor for string responses + if (($preprocess=~/\S/) && ($type eq 'cs' || $type eq 'ci')) { + if (defined(&$preprocess)) { + no strict 'refs'; + $response->[$j]=&$preprocess($response->[$j]); + use strict 'refs'; + } + } + + my ($award,$msg) = &caparesponse_check($answer->[$j], + $response->[$j]); + if ($type eq 'cs' || $type eq 'ci') { + $error = &verify_stringresponse($type,$award,$response->[$j], + $answer->[$j]); + } + push(@awards,$award); + push(@msgs, $msg); + } + my ($award,$msg) = + &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs); + $memoized{$key} = [$award,$msg]; + } + } else { + #FIXME broken with unorder responses where one is a + # and the other is a (need to delay parse til + # inside the loop?) + foreach my $response (@$responses) { + my $response_size = scalar(@{$response}); + foreach my $answer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) { + my $key = "$answer\0$response"; + my $answer_size = scalar(@{$answer}); + my ($award,$msg); + if ($answer_size > $response_size) { + $award = 'MISSING_ANSWER'; + } elsif ($answer_size < $response_size) { + $award = 'EXTRA_ANSWER'; + } else { + my (@awards,@msgs); + for (my $j=0; $j[$j] =~ /[\000-\037]/) { + $response->[$j] =~ s/[\000-\037]//g; + $control_chars_removed = 1; + } + } + } + # See if we have preprocessor + if (($preprocess=~/\S/) && ($type eq 'cs' || $type eq 'ci')) { + if (defined(&$preprocess)) { + no strict 'refs'; + $response->[$j]=&$preprocess($response->[$j]); + use strict 'refs'; + } + } + + my ($award,$msg) = &caparesponse_check($answer->[$j], + $response->[$j]); + if ($type eq 'cs' || $type eq 'ci') { + $error = &verify_stringresponse($type,$award,$response->[$j], + $answer->[$j]); + } + push(@awards,$award); + push(@msgs, $msg); + } + ($award,$msg) = + &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs); + } + $memoized{$key} = [$award,$msg]; + } + } + } + + my ($final_award,$final_msg); + &init_permutation(scalar(@$responses), + $LONCAPA::CAPAresponse_answer->{'type'}); + + # possible FIXMEs + # - significant time is spent calling non-safe space routine + # from safe space + # - early outs could be possible with classifying awards is to stratas + # and stopping as so as hitting the top strata + # - some early outs also might be possible with check ing the + # memoized hash of results (is correct even possible? etc.) + + my (@final_awards,@final_msg); + while( &get_permutations_left() ) { + my $order = &get_next_permutation(); + my (@awards, @msgs, $i); + foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) { + my $key = "$thisanswer\0".$responses->[$order->[$i]]; + push(@awards,$memoized{$key}[0]); + push(@msgs,$memoized{$key}[1]); + $i++; + + } + &LONCAPA_INTERNAL_DEBUG(" all awards ".join(':',@awards)); + + my ($possible_award,$possible_msg) = + &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs); + &LONCAPA_INTERNAL_DEBUG(" pos awards ".$possible_award); + push(@final_awards,$possible_award); + push(@final_msg,$possible_msg); + } + + &LONCAPA_INTERNAL_DEBUG(" all final_awards ".join(':',@final_awards)); + my ($final_award,$final_msg) = + &LONCAPA_INTERNAL_FINALIZEAWARDS(\@final_awards,\@final_msg,undef,1); + return ($final_award,$final_msg,$error,$control_chars_removed,$ansstring); +} + +sub verify_stringresponse { + my ($type,$award,$resp,$ans) = @_; + return if ($award eq 'EXACT_ANS'); + my $error; + if ($resp =~ /^\s|\s$/) { + $resp =~ s{^\s+|\s+$}{}g; + } + if ($ans =~ /^\s|\s$/) { + $ans =~ s{^\s+|\s+$}{}g; + } + if ($type eq 'ci') { + $resp = lc($resp); + $ans = lc($ans); + } + if ($resp eq $ans) { + if ($award eq 'INCORRECT') { + $error = 'MISGRADED'; + } + } + return $error; +} + +sub cas { + my ($system,$input,$library)=@_; + my $output; + my $dump; + if ($system eq 'maxima') { + $output=&maxima_eval($input,$library); + } elsif ($system eq 'R') { + ($output,$dump)=&r_eval($input,$library,0); + } else { + $output='Error: unrecognized CAS'; + } + return $output; +} + +sub cas_hashref { + my ($system,$input,$library)=@_; + if ($system eq 'maxima') { + return 'Error: unsupported CAS'; + } elsif ($system eq 'R') { + return &r_eval($input,$library,1); + } else { + return 'Error: unrecognized CAS'; + } +} + +# +# cas_hashref_entry takes a list of indices and gets the entry in a hash generated by Rreturn. +# Call: cas_hashref_entry(Rvalue, index1, index2, ...) where Rvalue is a hash returned by Rreturn. +# Rentry will return the first scalar value it encounters (ignoring excess indices). +# If an invalid key is given, it returns undef. +# +sub cas_hashref_entry { + return &Rentry(@_); +} + +# +# cas_hashref_array takes a list of indices and gets a column array from a hash generated by Rreturn. +# Call: cas_hashref_array(Rvalue, index1, index2, ...) where Rvalue is a hash returned by Rreturn. +# If an invalid key is given, it returns undef. +# +sub cas_hashref_array { + return &Rarray(@_); } sub tex { - if ( $external::target eq "tex" ) { - #$SCRIPT_RESULT.=@_[0]; - return @_[0]; - } else { - #$SCRIPT_RESULT.=@_[1]; - return @_[1]; - } + if ( $external::target eq "tex" ) { + return $_[0]; + } else { + return $_[1]; + } +} + +sub var_in_tex { + if ( $external::target eq "tex" ) { + return $_[0]; + } else { + return ""; + } } sub web { - if ( $external::target eq "tex" ) { - #$SCRIPT_RESULT.=@_[1]; - return @_[1]; - } else { - if ( $external::target eq "web") { - #$SCRIPT_RESULT.=@_[0]; - return @_[0]; - } else { - #$SCRIPT_RESULT.=@_[2]; - return @_[2]; - } - } -} - -sub problem { - $SCRIPT_RESULT.='1'; - return ''; + if ( $external::target eq "tex" ) { + return $_[1]; + } else { + if ( $external::target eq "web" || $external::target eq "answer") { + return $_[2]; + } else { + return $_[0]; + } + } +} + +sub html { + if ( $external::target eq "web" ) { + return shift; + } } sub hinton { - return 0; + return 0; } sub random { - my ($start,$end,$step)=@_; - if ( ! $RANDOMINIT ) { srand($external::randomseed); $RANDOMINIT=1; } - my $num=1+int(($end-$start)/$step); - my $result=$start + int(rand() * $num)*$step; - return $result; + my ($start,$end,$step)=@_; + if ( ! $hidden::RANDOMINIT ) { + if ($external::randomseed == 0) { $external::randomseed=1; } + if ($external::randomseed =~/,/) { + my ($num1,$num2)=split(/,/,$external::randomseed); + &random_set_seed(1,abs($num1)); + } elsif ($external::randomseed =~/:/) { + my ($num1,$num2)=split(/:/,$external::randomseed); + &random_set_seed(abs($num1),abs($num2)); + } else { + &random_set_seed(1,int(abs($external::randomseed))); + } + &math_random_uniform(); + $hidden::RANDOMINIT=1; + } + if (!defined($step)) { $step=1; } + my $num=1+int(($end-$start)/$step); + my $result=$start + int(&math_random_uniform() * $num)*$step; + return $result; } -sub tan { sin($_[0]) / cos($_[0]) } -sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); } -sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) ); } +sub random_normal { + my ($item_cnt,$seed,$av,$std_dev) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_normal($item_cnt,$av,$std_dev); + &random_set_seed(@oldseed); + return @retArray; +} -sub html { - if ( $external::target eq "web" ) { - #$SCRIPT_RESULT.=@_[0]; - return @_[0]; - } +sub random_beta { + my ($item_cnt,$seed,$aa,$bb) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_beta($item_cnt,$aa,$bb); + &random_set_seed(@oldseed); + return @retArray; } +sub random_gamma { + my ($item_cnt,$seed,$a,$r) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_gamma($item_cnt,$a,$r); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_exponential { + my ($item_cnt,$seed,$av) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_exponential($item_cnt,$av); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_poisson { + my ($item_cnt,$seed,$mu) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_poisson($item_cnt,$mu); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_chi { + my ($item_cnt,$seed,$df) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_chi_square($item_cnt,$df); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_noncentral_chi { + my ($item_cnt,$seed,$df,$nonc) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_noncentral_chi_square($item_cnt,$df,$nonc); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_f { + my ($item_cnt,$seed,$dfn,$dfd) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_f($item_cnt,$dfn,$dfd); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_noncentral_f { + my ($item_cnt,$seed,$dfn,$dfd,$nonc) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_noncentral_f($item_cnt,$dfn,$dfd,$nonc); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_multivariate_normal { + my ($item_cnt,$seed,$mean,$covar) = @_; + my @oldseed=&random_get_seed(); + &random_set_seed_from_phrase($seed); + my @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_multinomial { + my ($item_cnt,$seed,@p) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + my @retArray=&math_random_multinomial($item_cnt,@p); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_permutation { + my ($seed,@inArray) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_permutation(@inArray); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_uniform { + my ($item_cnt,$seed,$low,$high) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_uniform($item_cnt,$low,$high); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_uniform_integer { + my ($item_cnt,$seed,$low,$high) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_uniform_integer($item_cnt,$low,$high); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_binomial { + my ($item_cnt,$seed,$nt,$p) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_binomial($item_cnt,$nt,$p); + &random_set_seed(@oldseed); + return @retArray; +} + +sub random_negative_binomial { + my ($item_cnt,$seed,$ne,$p) = @_; + my @oldseed=&random_get_seed(); + my @retArray; + &random_set_seed_from_phrase($seed); + @retArray=&math_random_negative_binomial($item_cnt,$ne,$p); + &random_set_seed(@oldseed); + return @retArray; +} + +sub abs { CORE::abs(shift) } +sub sin { CORE::sin(shift) } +sub cos { CORE::cos(shift) } +sub exp { CORE::exp(shift) } +sub int { CORE::int(shift) } +sub log { CORE::log(shift) } +sub ln { CORE::log(shift) } +sub atan2 { CORE::atan2($_[0],$_[1]) } +sub sqrt { CORE::sqrt(shift) } + +sub tan { CORE::sin($_[0]) / CORE::cos($_[0]) } +#sub atan { atan2($_[0], 1); } +#sub acos { atan2(sqrt(1 - $_[0] * $_[0]), $_[0] ); } +#sub asin { atan2($_[0], sqrt(1- $_[0] * $_[0]) ); } + +sub log10 { CORE::log($_[0])/CORE::log(10); } + +sub factorial { + my $input = CORE::int(shift); + return "Error - unable to take factorial of an negative number ($input)" if $input < 0; + return "Error - factorial result is greater than system limit ($input)" if $input > 170; + return 1 if $input == 0; + my $result = 1; + for (my $i=2; $i<=$input; $i++) { $result *= $i } + return $result; +} + +sub sgn { + return -1 if $_[0] < 0; + return 0 if $_[0] == 0; + return 1 if $_[0] > 0; +} + +sub min { + my @sorted = sort { $a <=> $b || $a cmp $b } @_; + return shift @sorted; +} + +sub max { + my @sorted = sort { $a <=> $b || $a cmp $b } @_; + return pop @sorted; +} + +sub roundto { + my ($input,$n) = @_; + return sprintf('%.'.$n.'f',$input); +} + +sub to_string { + my ($input,$n) = @_; + return sprintf($input) if $n eq ""; + $n = '.'.$n if $n !~ /^\./; + return sprintf('%'.$n,$input) if $n ne ""; +} + +sub sub_string { + my ($str,$start,$len) = @_; + return substr($str,$start-1,$len); +} sub pow {return $_[0] ** $_[1]; } -sub ceil {return (($_[0]-int($_[0]))== 0.0) ? $_[0] : (int($_[0])+ 1); } -sub floor {return int($_[0]); } +sub ceil {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? (CORE::int($_[0])+ 1) : CORE::int($_[0])); } +sub floor {return (($_[0]-CORE::int($_[0]))== 0.0) ? $_[0] : (($_[0] > 0) ? CORE::int($_[0]) : (CORE::int($_[0])-1)); } +#sub floor {return int($_[0]); } sub format { - my ($value,$fmt)=@_; - $SCRIPT_RESULT.=sprintf('%.'.$fmt,$value); - return $SCRIPT_RESULT; + my ($value,$fmt)=@_; + my ($dollarmode,$commamode,$alwaysperiod,$options); + if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; } + #if ($options =~ /\$/) { $dollamode=1; } + #if ($options =~ /,/) { $commamode=1; } + if ($options =~ /\./) { $alwaysperiod=1; } + my $result; + if ($fmt=~/s$/i) { + $result=&format_significant_figures($value,$fmt); + } else { + $fmt=~s/e/E/g; + $result=sprintf('%.'.$fmt,$value); + if ($alwaysperiod && $fmt eq '0f') { $result .='.'; } + $result=~s/(E[+-]*)0/$1/; + } + #if ($dollarmode) {$result=&dollarformat($result);} + #if ($commamode) {$result=&commaformat($result);} + return $result; +} + +sub chemparse { + my ($reaction) = @_; + my @tokens = split(/(\s\+|\->|<=>|<\-|\.)/,$reaction); + my $formula = ''; + foreach my $token (@tokens) { + if ($token eq '->' ) { + $formula .= '\ensuremath{\rightarrow} '; + next; + } + if ($token eq '<-' ) { + $formula .= '\ensuremath{\leftarrow} '; + next; + } + if ($token eq '<=>') { + if ($external::target eq 'web' && + &EXT('request.browser.unicode')) { + $formula .= '⇌ '; + } else { + $formula .= &web('<=> ','\ensuremath{\rightleftharpoons} ', + '<=> '); + } + next; + } + if ($token eq '.') { + $formula =~ s/(\ \;| )$//; + $formula .= '·'; + next; + } + $token =~ /^\s*([\d|\/]*(?:&frac\d\d)?)(.*)/; + $formula .= $1 if ($1 ne '1'); # stoichiometric coefficient + + my $molecule = $2; + # subscripts + $molecule =~ s|(?<=[a-zA-Z\)\]\s])(\d+)|$1|g; + # superscripts + $molecule =~ s|\^(\d*[+\-]*)|$1|g; + # strip whitespace + $molecule =~ s/\s*//g; + # forced space + $molecule =~ s/_/ /g; + $molecule =~ s/-/−/g; + $formula .= $molecule.' '; + } + # get rid of trailing space + $formula =~ s/(\ \;| )$//; + return &xmlparse($formula); +} + +sub prettyprint { + my ($value,$fmt,$target)=@_; + my $result; + if (!$target) { $target = $external::target; } + if ($fmt =~ /chem/i) { return(&chemparse($value)); } + my ($dollarmode,$commamode,$alwaysperiod,$options); + if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; } + if ($options =~ /\$/) { $dollarmode=1; } + if ($options =~ /,/) { $commamode=1; } + if ($options =~ /\./) { $alwaysperiod=1; } + if ($fmt=~/s$/i) { + $value=&format_significant_figures($value,$fmt); + } elsif ($fmt) { + $value=sprintf('%.'.$fmt,$value); + } + if ($alwaysperiod && $fmt eq '0f') { + if ($target eq 'tex') { + $value .='\\ensuremath{.}'; + } else { + $value .='.'; + } + } + if ($value =~ /([0-9\.\-\+]+)E([0-9\-\+]+)/i ) { + my $frac=$1; + if ($dollarmode) { $frac=&dollarformat($frac); } + if ($commamode) { $frac=&commaformat($frac); } + my $exponent=$2; + $exponent=~s/^\+0*//; + $exponent=~s/^-0*/-/; + $exponent=~s/^-0*/-/; + if ($exponent eq '-') { undef($exponent); } + if ($exponent) { + if ($target eq 'web') { + $result=$frac.'×10'.$exponent.''; + } elsif ($target eq 'tex') { + $result='\ensuremath{'.$frac.'\times 10^{'.$exponent.'}}'; + } else { + $result=$value; + } + } else { + $result=$frac; + } + } else { + $result=$value; + if ($dollarmode) { $result=&dollarformat($result,$target); } + elsif ($commamode) { $result=&commaformat($result,$target); } + } + return $result; +} + +sub commaformat { + my ($number,$target) = @_; + if ($number =~ /\./) { + while ($number =~ /([^0-9]*)([0-9]+)([^\.,][^\.,][^\.,])([,0-9]*\.[0-9]*)$/) { + $number = $1.$2.','.$3.$4; + } + } else { + while ($number =~ /^([^0-9]*)([0-9]+)([^,][^,][^,])([,0-9]*)$/) { + $number = $1.$2.','.$3.$4; + } + } + return $number; +} + +sub dollarformat { + my ($number,$target) = @_; + if (!$target) { $target = $external::target; } + $number=&commaformat($number,$target); + if ($target eq 'tex') { + $number='\$'.$number; #' stupid emacs + } else { + $number='$'.$number; #' stupid emacs + } + return $number; +} + +# format of form ns or nS where n is an integer +sub format_significant_figures { + my ($number,$format) = @_; + return '0' if ($number == 0); + # extract number of significant figures needed + my ($sig) = ($format =~ /(\d+)s/i); + # arbitrary choice - suggestions ?? or throw error message? + $sig = 3 if ($sig eq ''); + # save the minus sign + my $sign = ($number < 0) ? '-' : ''; + $number = abs($number); + # needed to correct for a number greater than 1 (or + my $power = ($number < 1) ? 0 : 1; + if ($power && $number =~ /^\d+$/) { + my $nonzeros = $number; + $nonzeros =~ s/0+$//; + if (length($number) - length($nonzeros) > 1) { + # convert to exponential form + my $n = $sig-1; + my $numSig = sprintf('%.' . $n . 'E', $number); + # return number with sign + return $sign.$numSig; + } + } + # could round up. Take the integer part of log10. + my $x10 = int(log($number)/log(10)); + # find number with values left of decimal pt = # of sign figs. + my $xsig = $number*10**($sig-$x10-$power); + # get just digits left of decimal pt - also rounds off correctly + my $xint = sprintf('%.0f',$xsig); + # save any trailing zero's + my ($zeros) = ($xint =~ /(0+)$/); + # return number to original magnitude + my $numSig = $xint*10**($x10-$sig+$power); + # insert trailing zero's if have decimal point + $numSig =~ s/^(\d+)\.(\d+)(\e?(.*)?)$/$1\.$2$zeros$3/; + # put a decimal pt for number ending with 0 and length = # of sig fig + $numSig.='.' if (length($numSig) == $sig && $numSig =~ /0$/); + if (length($numSig) < $sig) { + $numSig.='.'.substr($zeros,0,($sig-length($numSig))); + } + # return number with sign + return $sign.$numSig; + } sub map { - my $num = $#_/2; - my $i; - my @used; - my @permutation; - for ($i=0; $i < $num;) { - $rand = &random(1,$num,1); - if ( $used[$rand] == '0' ) { - $i++; - $used[$rand]='1'; - $permutation[$i]=$rand; - } - } - for ( $i=1 ; $i<$num+1 ; $i++ ) { - ${$_[$permutation[$i]]}=$_[$i+$num] - } + my ($phrase,$dest,$source)=@_; + my @oldseed=&random_get_seed(); + my @seed = &random_seed_from_phrase($phrase); + &random_set_seed(@seed); + my $destct = scalar(@$dest); + if (!$source) { + my @output; + my @idx = &math_random_permuted_index($destct); + my $ctr = 0; + while ($ctr < $destct) { + $output[$ctr] = $$dest[$idx[$ctr]]; + $ctr++; + } + &random_set_seed(@oldseed); + return @output; + } else { + my $num = scalar(@$source); + my @idx = &math_random_permuted_index($num); + my $ctr = 0; + my $tot = $num; + $tot = $destct if $destct < $num; + if (ref($$dest[0])) { + while ($ctr < $tot) { + ${$$dest[$ctr]} = $$source[$idx[$ctr]]; + $ctr++; + } + } else { + while ($ctr < $tot) { + $$dest[$ctr] = $$source[$idx[$ctr]]; + $ctr++; + } + } + } + &random_set_seed(@oldseed); + return ''; +} + +sub rmap { + my ($phrase,$dest,$source)=@_; + my @oldseed=&random_get_seed(); + my @seed = &random_seed_from_phrase($phrase); + &random_set_seed(@seed); + my $destct = scalar(@$dest); + if (!$source) { + my @idx = &math_random_permuted_index($destct); + my $ctr = 0; + my @r_idx; + while ($ctr < $destct) { + $r_idx[$idx[$ctr]] = $ctr; + $ctr++; + } + my @output; + $ctr = 0; + while ($ctr < $destct) { + $output[$ctr] = $$dest[$r_idx[$ctr]]; + $ctr++; + } + &random_set_seed(@oldseed); + return @output; + } else { + my $num = scalar(@$source); + my @idx = &math_random_permuted_index($num); + my $ctr = 0; + my $tot = $num; + $tot = $destct if $destct < $num; + my @r_idx; + while ($ctr < $tot) { + $r_idx[$idx[$ctr]] = $ctr; + $ctr++; + } + $ctr = 0; + if (ref($$dest[0])) { + while ($ctr < $tot) { + ${$$dest[$ctr]} = $$source[$r_idx[$ctr]]; + $ctr++; + } + } else { + while ($ctr < $tot) { + $$dest[$ctr] = $$source[$r_idx[$ctr]]; + $ctr++; + } + } + } + &random_set_seed(@oldseed); + return ''; +} + +sub capa_id { return } + +sub problem { return } + +sub name{ + my $fullname = &EXT('environment.lastname').', '.&EXT('environment.firstname').' '.&EXT('environment.middlename'); + $fullname = "" if $fullname eq ", "; + $fullname =~ s/\%2d/-/g; + return $fullname; +} + +sub student_number { + my $id = &EXT('environment.id'); + $id = '' if $id eq ""; + return $id; +} + +sub class { + my $course = &EXT('course.description'); + $course = '' if $course eq ""; + return $course; +} + +sub classid { + my $courseid = &EXT('request.course.id'); + $courseid = '' if $courseid eq ""; + return $courseid; +} + +sub firstname { + my $firstname = &EXT('environment.firstname'); + $firstname = '' if $firstname eq ""; + return $firstname; +} + +sub middlename { + my $middlename = &EXT('environment.middlename'); + $middlename = '' if $middlename eq ""; + return $middlename; +} + +sub lastname { + my $lastname = &EXT('environment.lastname'); + $lastname = '' if $lastname eq ""; + return $lastname; +} + +sub sec { + my $sec = &EXT('request.course.sec'); + $sec = '' if $sec eq ""; + return $sec; +} + +sub submission { + my ($partid,$responseid,$subnumber,$encode)=@_; + my $sub=''; + if ($subnumber) { $sub=$subnumber.':'; } + my $output = + &EXT('user.resource.'.$sub.'resource.'.$partid.'.'.$responseid.'.submission'); + if ($encode) { + $output =~ s/&/&/g; + $output =~ s//>/g; + $output =~ s/"/"/g; + }; + return $output; +} + +sub currentpart { + return $external::part; +} + +sub eval_time { + my ($timestamp)=@_; + unless ($timestamp) { return ''; } + return &locallocaltime($timestamp); +} + +sub open_date { + my ($partid)=@_; + unless ($partid) { $partid=0; } + return &eval_time(&EXT('resource.'.$partid.'.opendate')); +} + +sub due_date { + my ($partid)=@_; + unless ($partid) { $partid=0; } + return &eval_time(&EXT('resource.'.$partid.'.duedate')); +} + +sub answer_date { + my ($partid)=@_; + unless ($partid) { $partid=0; } + return &eval_time(&EXT('resource.'.$partid.'.answerdate')); +} + +sub open_date_epoch { + my ($partid)=@_; + unless ($partid) { $partid=0; } + return &EXT('resource.'.$partid.'.opendate'); +} + +sub due_date_epoch { + my ($partid)=@_; + unless ($partid) { $partid=0; } + return &EXT('resource.'.$partid.'.duedate'); +} + +sub answer_date_epoch { + my ($partid)=@_; + unless ($partid) { $partid=0; } + return &EXT('resource.'.$partid.'.answerdate'); +} + +sub parameter_setting { + my ($which,$partid)=@_; + unless ($partid) { $partid=0; } + return &EXT('resource.'.$partid.'.'.$which); +} + +sub stored_data { + my ($which,$partid)=@_; + unless ($partid) { $partid=0; } + return &EXT('user.resource.resource.'.$partid.'.'.$which); +} + +sub wrong_bubbles { + my ($correct,$lower,$upper,$step,@given)=@_; + my @array=(); + my %hash=(); + foreach my $new (@given) { + $hash{$new}=1; + } + my $num=int(¶meter_setting('numbubbles',¤tpart())); + unless ($num) { $num=8; } + if ($num>1) { + for (my $i=0;$i<=500;$i++) { + my $new=&random($lower,$upper,$step); + if ($hash{$new}) { next; } + if (abs($new-$correct)<$step) { next; } + $hash{$new}=1; + @array=keys(%hash); + if ($#array+2>=$num) { last; } + } + } + return @array; +} + +sub array_moments { + my @input=@_; + my (@output,$N); + $N=scalar (@input); + $output[0]=$N; + if ($N <= 1) { + $output[1]=$input[0]; + $output[1]="Input array not defined" if ($N == 0); + $output[2]="variance undefined for N<=1"; + $output[3]="skewness undefined for N<=1"; + $output[4]="kurtosis undefined for N<=1"; + return @output; + } + my $sum=0; + foreach my $line (@input) { + $sum+=$line; + } + $output[1] = $sum/$N; + my ($x,$sdev,$var,$skew,$kurt) = 0; + foreach my $line (@input) { + $x=$line-$output[1]; + $var+=$x**2; + $skew+=$x**3; + $kurt+=$x**4; + } + $output[2]=$var/($N-1); + $sdev=CORE::sqrt($output[2]); + if ($sdev == 0) { + $output[3]="inf-variance=0"; + $output[4]="inf-variance=0"; + return @output; + } + $output[3]=$skew/($sdev**3*$N); + $output[4]=$kurt/($sdev**4*$N)-3; + return @output; } sub choose { - my $num = $_[0]; - return $_[$num]; + my $num = $_[0]; + return $_[$num]; } -#$external::randomseed=time; -#$a=2; -#$b=2; -#$c=2; -#&map(1,\$a,\$b,\$c,3,4,5); -#print $a."\n".$b."\n"; + +#&sum1(1,$x,sub { &sum1($_[0],2*$_[0], sub { fact($_[0])**2 })}); +#sub sum1 { +# my ($start,$end,$sub)=@_; +# my $sum=0; +# for (my $i=$start;$i<=$end;$i++) { +# $sum+=&$sub($i); +# } +# return $sum +#} + +#&sum2('a',1,$x,'&sum2(\'b\',$a,2*$a, \'&factorial($b)**2\')'); +#sub sum2 { +# my ($varname,$start,$end,$line)=@_; +# my $sum=0; +# for (my $i=$start;$i<=$end;$i++) { +# my $func=sub { +# eval("\$".$varname."=$i"); +# eval($line); +# }; +# $sum+=&$func($i); +# } +# return $sum +#} + +# expiremental idea +sub proper_path { + my ($path)=@_; + if ( $external::target eq "tex" ) { + return '/home/httpd/html'.$path; + } else { + return $path; + } +} +