--- loncom/homework/default_homework.lcpm	2001/07/23 22:40:59	1.32
+++ loncom/homework/default_homework.lcpm	2002/02/06 16:18:26	1.46
@@ -1,33 +1,57 @@
-# file name (temp): default_homework
+# The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
+# $Id: default_homework.lcpm,v 1.46 2002/02/06 16:18:26 albertel 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/
+#
+#
 # Guy Albertelli
 #
 # 05/25/2001 H. K. Ng
 # 05/31/2001 H. K. Ng
+# 12/21/2001 Matthew
 #
 #init some globals
-$RANDOMINIT=0;
+$hidden::RANDOMINIT=0;
 $pi=atan2(1,1)*4;
 $rad2deg=180.0/$pi;
 $deg2rad=$pi/180.0;
+$"=' ';
 
 sub caparesponse_check {
-  my $answer='';  #done
-  my $type='';    #done
+  #not properly used yet: calc
+  #not to be used: $ans_fmt
+  my ($answer,$type,$tol,$sig,$ans_fmt,$unit,$calc,$samples) =
+    eval $_[1].
+      ';return ($answer,$type,$tol,$sig,$ans_fmt,$unit,$calc,$samples);';
+
   my $tol_type=''; # gets it's value from whether tol has a % or not done
-  my $tol='';     #done
-  my $sig='';     #done lowerbnd,upperbnd
   my $sig_lbound=''; #done
   my $sig_ubound=''; #done
-  my $ans_fmt='';
-  my $unit='';     #done
-  my $calc='';
   my ($response,$expr)=@_;
 
 
-  ($answer,$type,$tol,$sig,$ans_fmt,
-   $unit,$calc) = eval $expr.';return ($answer,$type,$tol,$sig,$ans_fmt,$unit,$calc);';
   #type's definitons come from capaParser.h
   my $message='';
   #remove leading and trailing whitespace
@@ -48,9 +72,18 @@ sub caparesponse_check {
     } elsif ($type eq 'mc')    { $type = 5;
     } elsif ($type eq 'fml')   { $type = 8;
     } elsif ($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);
+    $message.="Found :$points: points<br />";
+  }
   if ($tol eq '') {
     $tol=0.0;
     $tol_type=1; #TOL_ABSOLUTE
@@ -68,11 +101,17 @@ sub caparesponse_check {
     $sig_ubound =15; #SIG_UB_DEFAULT
   } else {
     ($sig_lbound,$sig_ubound) = split /,/,$sig;
+    if (!$sig_lbound) {
+      $sig_lbound = 0; #SIG_LB_DEFAULT
+      $sig_ubound =15; #SIG_UB_DEFAULT
+    }
+    if (!$sig_ubound) { $sig_ubound=$sig_lbound; }
   }
   my $result = &caparesponse_capa_check_answer($response,$answer,$type,
 					       $tol_type,$tol,
 					       $sig_lbound,$sig_ubound,
-					       $ans_fmt,$unit,$calc);
+					       $ans_fmt,$unit,$calc,$id_list,
+					       $points,$external::randomseed);
 
   if    ($result == '1') { $result='EXACT_ANS'; } 
   elsif ($result == '2') { $result='APPROX_ANS'; }
@@ -88,25 +127,36 @@ sub caparesponse_check {
   elsif ($result =='12') { $result='WANTED_NUMERIC'; }
   else  {$result = "ERROR: Unknown Result:$result:$@:";}
 
-  return "$result:<br />Error $error:<br />Answer $answer:<br />Response $response:<br /> type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$units<br />$message$expr";
+  return "$result:<br />Error $error:<br />Answer $answer:<br />Response $response:<br /> type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|<br />$message$expr";
 }
 
-sub caparesponse_check_list {
-  my ($response,$expr)=@_;
+sub get_array_args {
+  my ($expr,$arg)=@_;
   # do these first, because who knows what varname the instructor might have used
   # but it probably isn't $CAPARESPONSE_CHECK_LIST_answer
-  my $CAPARESPONSE_CHECK_LIST_answer = eval $expr.';return $answer';
-  my (@list) = eval $CAPARESPONSE_CHECK_LIST_answer;
-  my $result='';
-  $result.="error:$@:<br />";
+  my $CAPARESPONSE_CHECK_LIST_answer = eval $expr.';return $'.$arg; #'
+  my $GET_ARRAY_ARGS_result;
+  my @GET_ARRAY_ARGS_list;
+  if ($CAPARESPONSE_CHECK_LIST_answer =~ /^\s*[\$\@]/) {
+    (@GET_ARRAY_ARGS_list) = eval $CAPARESPONSE_CHECK_LIST_answer;
+  }
+  $GET_ARRAY_ARGS_result.="error:$@:<br />";
   # if the eval fails just use what is in the answer exactly
-  if (!defined(@list) || !defined($list[0])) {
-    $result.="list zero is undefined<br />";
-    $list[0]=$CAPARESPONSE_CHECK_LIST_answer;
+  if (!defined(@GET_ARRAY_ARGS_list) || !defined($GET_ARRAY_ARGS_list[0])) {
+    $GET_ARRAY_ARGS_result.="list zero is undefined<br />";
+    $GET_ARRAY_ARGS_list[0]=$CAPARESPONSE_CHECK_LIST_answer;
   }
+  return $GET_ARRAY_ARGS_result,@GET_ARRAY_ARGS_list;
+}
+
+sub caparesponse_check_list {
+  my ($response,$expr)=@_;
+  my $result;
+  my ($result,@list) = &get_array_args($expr,'answer');
   my $aresult='';
   my $current_answer;
-  $result.="Got response :$CAPARESPONSE_CHECK_LIST_answer:$list[0]:<br />";
+  my $answers=join(':',@list);
+  $result.="Got response :$answers:<br />";
   my @responselist;
   my $type =eval $expr.';return $answer;';
   if ($type ne '' && $#list > 0) {
@@ -165,7 +215,7 @@ sub web {
   if ( $external::target eq "tex" ) {
     return @_[1];
   } else {
-    if ( $external::target eq "web") {
+    if ( $external::target eq "web" || $external::target eq "answer") {
       return @_[2];
     } else {
       return @_[0];
@@ -189,7 +239,11 @@ sub hinton {
 
 sub random {
   my ($start,$end,$step)=@_;
-  if ( ! $RANDOMINIT ) { srand($external::randomseed); $RANDOMINIT=1; }
+  if ( ! $hidden::RANDOMINIT ) {
+    srand($external::randomseed);
+    $hidden::RANDOMINIT=1;
+  }
+  if (!defined($step)) { $step=1; }
   my $num=1+int(($end-$start)/$step);
   my $result=$start + int(rand() * $num)*$step;
   return $result;
@@ -268,16 +322,9 @@ sub random_noncentral_f {
 }
 
 sub random_multivariate_normal {
-  my ($item_cnt,$seed,@mean) = @_;
-  return "Number of deviates must be greater than 0" if $item_cnt <= 0;
-  my (@covar,@retArray);
-  my $ind = 0;
-  while ($ind<$item_cnt) {
-     push @covar, pop (@mean);
-     $ind++;
-  }
+  my ($item_cnt,$seed,$mean,$covar) = @_;
   &random_set_seed_from_phrase($seed);
-  @retArray=&math_random_multivariate_normal($item_cnt,@mean,@covar);
+  @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar);
   return @retArray;
 }
 
@@ -398,6 +445,27 @@ sub format {
   return sprintf('%.'.$fmt,$value);
 }
 
+sub prettyprint {
+  my ($value,$fmt)=@_;
+  my $result;
+  if ($fmt) { $value=sprintf('%.'.$fmt,$value); }
+  if ($value =~ /([0-9\.\-\+]+)E([0-9\-\+]+)/ ) {
+    my $frac=$1;
+    my $exponent=$2;
+    $exponent=~s/^\+0*//;
+    if ($external::target eq 'web') {
+      $result=$frac.'&#215;10<sup>'.$exponent.'</sup>';
+    } elsif ($external::target eq 'tex') {
+      $result='\ensuremath{'.$frac.'\times 10^{'.$exponent.'}}';
+    } else {
+      $result=$value;
+    }
+  } else {
+    $result=$value;
+  }
+  return $result;
+}
+
 sub map {
     my ($phrase,$dest,$source)=@_;
     my @seed = &random_seed_from_phrase($phrase);