--- loncom/homework/default_homework.lcpm	2008/06/12 00:46:52	1.136
+++ loncom/homework/default_homework.lcpm	2008/09/12 09:56:09	1.139
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # used by lonxml::xmlparse() as input variable $safeinit to Apache::run::run()
 #
-# $Id: default_homework.lcpm,v 1.136 2008/06/12 00:46:52 www Exp $
+# $Id: default_homework.lcpm,v 1.139 2008/09/12 09:56:09 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -254,11 +254,12 @@ sub caparesponse_check {
 
     &LONCAPA_INTERNAL_DEBUG("RetError $reterror: Answer $answer: Response $response:  type-$type|$tol|$tol_type|$sig:$sig_lbound:$sig_ubound|$unit|");
     &LONCAPA_INTERNAL_DEBUG(" $answer $response $result ");
-    return ($result,$reterror)
+    return ($result,$reterror);
 }
 
 
 sub caparesponse_check_list {
+    my ($tag) = @_;
     my $responses=$LONCAPA::CAPAresponse_args{'response'};
     &LONCAPA_INTERNAL_DEBUG("args ".join(':',%LONCAPA::CAPAresponse_args));
     my $type = $LONCAPA::CAPAresponse_args{'type'};
@@ -303,7 +304,7 @@ sub caparesponse_check_list {
 
     &LONCAPA_INTERNAL_DEBUG("Initial final response :$responses->[0][-1]:");
     my $unit;
-    if ($type eq '' || $type eq 'float') {
+    if (($type eq 'float') || (($type eq '') && (($tag ne 'stringresponse') && ($tag ne 'stringhint')) ) ) {
 	#for numerical problems split off the unit
 #	if ( $responses->[0][-1]=~ /(.*[^\s])\s+([^\s]+)/ ) {
         if ( $responses->[0][-1]=~ /^([\d\.\,\s\$]*(?:(?:[xX\*]10[\^\*]*|[eE]*)[\+\-]*\d*)*(?:^|\S)\d+)([\$\s\w\^\*\/\(\)\+\-]*[^\d\.\s\,][\$\s\w\^\*\/\(\)\+\-]*)$/ ) {
@@ -316,7 +317,9 @@ sub caparesponse_check_list {
     $unit=~s/\s//;
     foreach my $response (@$responses) {
        foreach my $element (@$response) {	
-          $element =~ s/\s//g;
+          if (($type eq 'float') || (($type eq '') && ($unit ne ''))) {
+              $element =~ s/\s//g;
+          }
           my $appendunit=$unit;
           if ($unit=~/\%/) {
              $element=$element/100;
@@ -424,10 +427,12 @@ sub caparesponse_check_list {
 }
 
 sub cas {
-    my ($system,$input)=@_;
+    my ($system,$input,$library)=@_;
     my $output;
     if ($system eq 'maxima') {
-       $output=&maxima_eval($input);
+       $output=&maxima_eval($input,$library);
+    } else {
+       $output='Error: unrecognized CAS';
     }
     return $output;
 }