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Diff for /loncom/homework/default_homework.lcpm between versions 1.116 and 1.152

version 1.116, 2006/09/29 20:55:33 version 1.152, 2011/02/26 17:50:13
Line 58  use strict; Line 58  use strict;
     sub get_next_permutation {      sub get_next_permutation {
  if ($num_left == $total) {   if ($num_left == $total) {
     $num_left--;      $num_left--;
     return @order;      return \@order;
  }   }
   
  # Find largest index j with a[j] < a[j+1]   # Find largest index j with a[j] < a[j+1]
Line 92  use strict; Line 92  use strict;
  }   }
   
  $num_left--;   $num_left--;
  return(@order);   return(\@order);
     }      }
           
     sub get_permutations_left {      sub get_permutations_left {
Line 126  sub check_commas { Line 126  sub check_commas {
     return 1;      return 1;
 }  }
   
   
 sub caparesponse_check {  sub caparesponse_check {
     my ($answer,$response)=@_;      my ($answer,$response)=@_;
     #not properly used yet: calc      #not properly used yet: calc
Line 151  sub caparesponse_check { Line 152  sub caparesponse_check {
     }      }
     if ($response=~ /^\s|\s$/) {      if ($response=~ /^\s|\s$/) {
  $response=~ s:^\s+|\s+$::g;   $response=~ s:^\s+|\s+$::g;
  &LONCAPA_INTENAL_DEBUG("Removed ws now :$response:");   &LONCAPA_INTERNAL_DEBUG("Removed ws now :$response:");
     }      }
   
     &LONCAPA_INTERNAL_DEBUG(" type is $type ");      #&LONCAPA_INTERNAL_DEBUG(" type is $type ");
     if ($type eq 'cs' || $type eq 'ci') {      if ($type eq 'cs' || $type eq 'ci') {
  #for string answers make surec all places spaces occur, there is    #for string answers make sure all places spaces occur, there is 
         #really only 1 space, in both the answer and the response          #really only 1 space, in both the answer and the response
  $answer=~s/ +/ /g;   $answer=~s/ +/ /g;
  $response=~s/ +/ /g;   $response=~s/ +/ /g;
Line 165  sub caparesponse_check { Line 166  sub caparesponse_check {
  $response=~s/[\s,]//g;   $response=~s/[\s,]//g;
     }      }
     if ($type eq 'float' && $unit=~/\$/) {      if ($type eq 'float' && $unit=~/\$/) {
  if ($response!~/^\$/)  { return "NO_UNIT: Missing \$ "; }   if ($response!~/^\$|\$$/)  { return ('NO_UNIT', undef); }
  $response=~s/\$//g;   $response=~s/\$//g;
     }      }
     if ($type eq 'float' && $unit=~/\,/ && (&check_commas($response)<0)) {      if ($type eq 'float' && $unit=~/\,/ && (&check_commas($response)<0)) {
Line 175  sub caparesponse_check { Line 176  sub caparesponse_check {
     $unit=~s/[\$,]//g;      $unit=~s/[\$,]//g;
     if ($type eq 'float') { $response=~s/,//g; }      if ($type eq 'float') { $response=~s/,//g; }
   
     if (length($response) > 500) { return "TOO_LONG: Answer too long"; }      if (length($response) > 500) { return ('TOO_LONG',undef); }
   
     if ($type eq '' ) {      if ($type eq '' ) {
  &LONCAPA_INTERNAL_DEBUG("Didn't find a type :$type: defaulting");   &LONCAPA_INTERNAL_DEBUG("Didn't find a type :$type: defaulting");
Line 190  sub caparesponse_check { Line 191  sub caparesponse_check {
  elsif ($type eq 'subj')  { $type = 7; }   elsif ($type eq 'subj')  { $type = 7; }
  elsif ($type eq 'float') { $type = 2; }   elsif ($type eq 'float') { $type = 2; }
  elsif ($type eq 'int')   { $type = 1; }   elsif ($type eq 'int')   { $type = 1; }
  else { return "ERROR: Unknown type of answer: $type" }   else { return ('ERROR', "Unknown type of answer: $type") }
     }      }
   
     my $points;      my $points;
Line 216  sub caparesponse_check { Line 217  sub caparesponse_check {
   
     my $reterror="";      my $reterror="";
     my $result;      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 ($type eq '9') {      if ($type eq '9') {
       $result = &maxima_check(&maxima_cas_formula_fix($response),&maxima_cas_formula_fix($answer),\$reterror);        $result = &maxima_check(&maxima_cas_formula_fix($response),&maxima_cas_formula_fix($answer),\$reterror);
     } else {      } else {
Line 250  sub caparesponse_check { Line 258  sub caparesponse_check {
     elsif ($result =='15') { $result='UNIT_IRRECONCIBLE'; }      elsif ($result =='15') { $result='UNIT_IRRECONCIBLE'; }
     else  {$result = "ERROR: Unknown Result:$result:$@:";}      else  {$result = "ERROR: Unknown Result:$result:$@:";}
   
     &LONCAPA_INTERNAL_DEBUG("RetError $reterror: Answer $answer: Response $response:  type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|",$reterror);      &LONCAPA_INTERNAL_DEBUG("RetError $reterror: Answer $answer: Response $response:  type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|");
     return ($result,$reterror)      &LONCAPA_INTERNAL_DEBUG(" $answer $response $result ");
       return ($result,$reterror);
 }  }
   
 sub maxima_cas_formula_fix {  
    my ($expression)=@_;  
    return &implicit_multiplication($expression);  
 }  
   
 sub capa_formula_fix {  
    my ($expression)=@_;  
    return &implicit_multiplication($expression);  
 }  
   
 sub implicit_multiplication {  
     my ($expression)=@_;  
 # Escape scientific notation, so 3e8 does not become 3*e*8  
 # 3e8 -> 3&8; 3e-8 -> 3&-8; 3E+8 -> e&+8  
     $expression=~s/(\d+)e([\+\-]*\d+)/$1\&\($2\)/gsi;  
 # 3x10^8 -> 3&8; 3*10^-8 -> 3&-8  
     $expression=~s/(\d+)(?:x|\*)10(?:\^|\*\*)([\+\-]*\d+)/$1\&\($2\)/gsi;  
 # Fill in multiplication signs  
 # a b -> a*b;3 b -> 3*b;3 4 -> 3*4  
     $expression=~s/(\w)\s+(\w)/$1\*$2/gs;  
 # )( -> )*(; ) ( -> )*(  
     $expression=~s/\)\s*\(/\)\*\(/gs;  
 # 3a -> 3*a; 3( -> 3*(; 3 ( -> 3*(; 3A -> 3*A  
     $expression=~s/(\d)\s*([a-zA-Z\(])/$1\*$2/gs;  
 # a ( -> a*(  
     $expression=~s/(\w)\s+\(/$1\*\(/gs;  
 # a3 -> a*3;  
     $expression=~s/([a-zA-Z])(\d)/$1\*$2/gs;  
 # )a -> )*a; )3 -> )*3; ) 3 -> )*3  
     $expression=~s/\)\s*(\w)/\)\*$1/gs;  
 # 3&8 -> 3e8; 3&-4 -> 3e-4  
     $expression=~s/(\d+)\&\(([\+\-]*\d+)\)/$1e$2/gs;  
     return $expression;  
 }  
   
 sub caparesponse_check_list {  sub caparesponse_check_list {
     my $response=$LONCAPA::CAPAresponse_args{'response'};      my $responses=$LONCAPA::CAPAresponse_args{'response'};
     my $result="Got response :".join(':',@LONCAPA::CAPAresponse_answer).":\n";  
     &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args));      &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args));
     my @responselist;  
     my $type = $LONCAPA::CAPAresponse_args{'type'};      my $type = $LONCAPA::CAPAresponse_args{'type'};
     &LONCAPA_INTERNAL_DEBUG("Got type :$type:\n");      my $answerunit=$LONCAPA::CAPAresponse_args{'unit'};
     my $num_answers = scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}});      &LONCAPA_INTERNAL_DEBUG("Got type :$type: answer unit :$answerunit:\n");
     if ($type ne ''       
  && $num_answers > 1) {      my $num_input_lines =
  (@responselist)=split(/,/,$response);   scalar(@{$LONCAPA::CAPAresponse_answer->{'answers'}});
  if (@responselist < $num_answers) {      
       if ($type ne '' ) {
    if (scalar(@$responses) < $num_input_lines) {
     return 'MISSING_ANSWER';      return 'MISSING_ANSWER';
  }   }
  if (@responselist > $num_answers) {   if (scalar(@$responses) > $num_input_lines) {
     return 'EXTRA_ANSWER';      return 'EXTRA_ANSWER';
  }   }
     } else {  
  (@responselist)=($response);  
     }      }
     &LONCAPA_INTERNAL_DEBUG("Initial final response :$responselist['-1']:");  
       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';
    }
       }
   
       &LONCAPA_INTERNAL_DEBUG("Initial final response :$responses->[0][-1]:");
     my $unit;      my $unit;
     if ($type eq '' || $type eq 'float') {      if ($type eq 'float' || $type eq '') {
  #for numerical problems split off the unit   #for numerical problems split off the unit
  if ( $responselist['-1']=~ /(.*[^\s])\s+([^\s]+)/ ) {  # if ( $responses->[0][-1]=~ /(.*[^\s])\s+([^\s]+)/ ) {
     $responselist['-1']=$1;          if ( $responses->[0][-1]=~ /^([\d\.\,\s\$]*(?:(?:[xX\*]10[\^\*]*|[eE]*)[\+\-]*\d*)*(?:^|\S)\d+)([\$\s\w\^\*\/\(\)\+\-]*[^\d\.\s\,][\$\s\w\^\*\/\(\)\+\-]*)$/ ) {
     $unit=$2;      $responses->[0][-1]=$1;
       $unit=&capa_formula_fix($2);
               &LONCAPA_INTERNAL_DEBUG("Found unit :$unit:");
  }   }
     }      }
     &LONCAPA_INTERNAL_DEBUG("Final final response :$responselist['-1']:$unit:");      &LONCAPA_INTERNAL_DEBUG("Final final response :$responses->[0][-1]:$unit:");
     $unit=~s/\s//;      $unit=~s/\s//;
       my $error;
       foreach my $response (@$responses) {
          foreach my $element (@$response) {
             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;
             }
             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; $i<scalar(@$responses);$i++) {
       my $answer   = $LONCAPA::CAPAresponse_answer->{'answers'}[$i];
       my $response = $responses->[$i];
       my $key = "$answer\0$response";
       my (@awards,@msgs);
       for (my $j=0; $j<scalar(@$response); $j++) {
                   if ($type eq 'cs' || $type eq 'ci') {
                       unless ($allow_control_char) {
                           if ($response->[$j] =~ /[\000-\037]/) { 
                               $response->[$j] =~ s/[\000-\037]//g;
                               $control_chars_removed = 1;
                           }  
                       }
                   }
    my ($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 <value>
           #      and the other is a <vector> (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; $j<scalar(@$response); $j++) {
                           if ($type eq 'cs' || $type eq 'ci') {
                               unless ($allow_control_char) {
                                   if ($response->[$j] =~ /[\000-\037]/) {
                                       $response->[$j] =~ s/[\000-\037]//g;
                                       $control_chars_removed = 1;
                                   }
                               }
                           }
    my ($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];
       }
    }
       }
   
     #&reset_caparesponse_memoization();  
     my ($final_award,$final_msg);      my ($final_award,$final_msg);
     &init_permutation(scalar(@responselist),      &init_permutation(scalar(@$responses),
       $LONCAPA::CAPAresponse_answer->{'type'});        $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() ) {      while( &get_permutations_left() ) {
  my @responses_ordered = @responselist[&get_next_permutation()];   my $order = &get_next_permutation();
  my (@awards, @msgs, $i);   my (@awards, @msgs, $i);
  foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {   foreach my $thisanswer (@{ $LONCAPA::CAPAresponse_answer->{'answers'} }) {
     my ($msg,$aresult);      my $key = "$thisanswer\0".$responses->[$order->[$i]];
     if (defined($thisanswer)) {      push(@awards,$memoized{$key}[0]);
  my $response = $responses_ordered[$i];      push(@msgs,$memoized{$key}[1]);
  if ($unit eq '') {  
     $response .= " $unit";  
  }  
  ($aresult,$msg)=&caparesponse_check($thisanswer,$response);  
     } else {  
  $aresult='ERROR';  
  $msg='answer was undefined';  
     }  
     #&LONCAPA_INTERNAL_DEBUG("after if $aresult -- $msg");  
     my ($temp)=split(/:/, $aresult);  
     push(@awards,$temp);  
     push(@msgs,$msg);  
     $i++;      $i++;
   
  }   }
    &LONCAPA_INTERNAL_DEBUG(" all awards ".join(':',@awards));
   
  my ($possible_award,$possible_msg) =    my ($possible_award,$possible_msg) = 
     &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);      &LONCAPA_INTERNAL_FINALIZEAWARDS(\@awards,\@msgs);
  if ($final_award) {   &LONCAPA_INTERNAL_DEBUG(" pos awards ".$possible_award);
     ($final_award,$final_msg) =    push(@final_awards,$possible_award);
  &LONCAPA_INTERNAL_FINALIZEAWARDS([$final_award,$possible_award],   push(@final_msg,$possible_msg);
  [$final_msg,$possible_msg],      }
  undef,1);  
  } else {      &LONCAPA_INTERNAL_DEBUG(" all final_awards ".join(':',@final_awards));
     ($final_award,$final_msg) = ($possible_award,$possible_msg);      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,$library,1);
       } else {
          return 'Error: unrecognized CAS';
     }      }
     #&reset_caparesponse_memoization();  }
     return ($final_award,$final_msg);  
   #
   # 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 {  sub tex {
Line 953  sub sec { Line 1143  sub sec {
     return $sec;      return $sec;
 }  }
   
   sub submission {
      my ($partid,$responseid,$subnumber)=@_;
      my $sub='';
      if ($subnumber) { $sub=$subnumber.':'; }
      return &EXT('user.resource.'.$sub.'resource.'.$partid.'.'.$responseid.'.submission');
   }
   
   sub currentpart {
      return $external::part;
   }
   
   sub eval_time {
      my ($timestamp)=@_;
      unless ($timestamp) { return ''; }
      return &locallocaltime($timestamp);
   }
   
 sub open_date {   sub open_date { 
     my @dc = split(/\s+/,localtime(&EXT('resource.0.opendate')));      my ($partid)=@_;
     return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);      unless ($partid) { $partid=0; }
     my @hm = split(/:/,$dc[3]);      return &eval_time(&EXT('resource.'.$partid.'.opendate'));
     my $ampm = " am";  }
     if ($hm[0] > 12) {  
  $hm[0]-=12;  sub due_date {
  $ampm = " pm";      my ($partid)=@_;
     }      unless ($partid) { $partid=0; } 
     return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;      return &eval_time(&EXT('resource.'.$partid.'.duedate'));
 }  
   
 sub due_date {   
     my @dc = split(/\s+/,localtime(&EXT('resource.0.duedate')));  
     return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);  
     my @hm = split(/:/,$dc[3]);  
     my $ampm = " am";  
     if ($hm[0] > 12) {  
  $hm[0]-=12;  
  $ampm = " pm";  
     }  
     return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;  
 }  }
   
 sub answer_date {   sub answer_date { 
     my @dc = split(/\s+/,localtime(&EXT('resource.0.answerdate')));      my ($partid)=@_;
     return '' if ($dc[0] eq "Wed" and $dc[2] == 31 and $dc[4] == 1969);      unless ($partid) { $partid=0; }
     my @hm = split(/:/,$dc[3]);      return &eval_time(&EXT('resource.'.$partid.'.answerdate'));
     my $ampm = " am";  }
     if ($hm[0] > 12) {  
  $hm[0]-=12;  sub open_date_epoch {
  $ampm = " pm";      my ($partid)=@_;
     }      unless ($partid) { $partid=0; }
     return $dc[0].', '.$dc[1].' '.$dc[2].', '.$dc[4].' at '.$hm[0].':'.$hm[1].$ampm;      return &EXT('resource.'.$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 array_moments {  sub array_moments {
Removed from v.1.116  
changed lines
  Added in v.1.152

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