--- loncom/homework/default_homework.lcpm	2005/07/13 20:44:29	1.101
+++ loncom/homework/default_homework.lcpm	2005/11/16 22:18:22	1.104
@@ -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 1.101 2005/07/13 20:44:29 albertel Exp $
+# $Id: default_homework.lcpm,v 1.104 2005/11/16 22:18:22 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -193,7 +193,7 @@ sub caparesponse_check_list {
     my $type = $LONCAPA::CAPAresponse_args{'type'};
     $result.="Got type :$type:\n";
     if ($type ne '' && $#list > 0) {
-	(@responselist)=split /,/,$response;
+	(@responselist)=split(/,/,$response);
     } else {
 	(@responselist)=($response);
     }
@@ -217,18 +217,23 @@ sub caparesponse_check_list {
 	$result.="trying answer :$list[$i]:\n";
 	my $thisanswer=$list[$i];
 	$result.="trying answer :$thisanswer:\n";
-	if ($unit eq '') {
-	    ($aresult,$msg)=&caparesponse_check($thisanswer,$responselist[$i]);
+	if (defined($list[$i])) { 
+	    if ($unit eq '') {
+		($aresult,$msg)=&caparesponse_check($thisanswer,
+						    $responselist[$i]);
+	    } else {
+		($aresult,$msg)=&caparesponse_check($thisanswer,
+						    $responselist[$i]." $unit");
+	    }
 	} else {
-	    ($aresult,$msg)=&caparesponse_check($thisanswer,
-						$responselist[$i]." $unit");
+	    $aresult='ERROR';
 	}
-	my ($temp)=split /:/, $aresult;
+	my ($temp)=split(/:/, $aresult);
 	$awards.="$temp,";
 	$result.=$aresult;
 	push(@msgs,$msg);
     }
-    chop $awards;
+    chop($awards);
     return ("$awards:\n$result",@msgs);
 }
 
@@ -451,14 +456,14 @@ sub random_negative_binomial {
     return @retArray;
 }
 
-sub abs { abs(shift) }
-sub sin { sin(shift) }
-sub cos { cos(shift) }
-sub exp { exp(shift) }
-sub int { int(shift) }
-sub log { log(shift) }
-sub atan2 { atan2($_[0],$_[1]) }
-sub sqrt { sqrt(shift) }
+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 atan2 { CORE::atan2($_[0],$_[1]) }
+sub sqrt { CORE::sqrt(shift) }
 
 sub tan  { CORE::sin($_[0]) / CORE::cos($_[0]) }
 #sub atan { atan2($_[0], 1); }
@@ -637,12 +642,12 @@ sub prettyprint {
 sub commaformat {
     my ($number,$target) = @_;
     if ($number =~ /\./) {
-	while ($number =~ /([^\.,]+)([^\.,][^\.,][^\.,])([,0-9]*\.[0-9]*)$/) {
-	    $number = $1.','.$2.$3;
+	while ($number =~ /([^0-9]*)([0-9]+)([^\.,][^\.,][^\.,])([,0-9]*\.[0-9]*)$/) {
+	    $number = $1.$2.','.$3.$4;
 	}
     } else {
-	while ($number =~ /([^,]+)([^,][^,][^,])([,0-9]*)$/) {
-	    $number = $1.','.$2.$3;
+	while ($number =~ /^([^0-9]*)([0-9]+)([^,][^,][^,])([,0-9]*)$/) {
+	    $number = $1.$2.','.$3.$4;
 	}
     }
     return $number;