--- loncom/homework/default_homework.lcpm	2004/06/09 21:16:43	1.87
+++ loncom/homework/default_homework.lcpm	2004/10/11 16:31:34	1.90
@@ -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 1.87 2004/06/09 21:16:43 albertel Exp $
+# $Id: default_homework.lcpm,v 1.90 2004/10/11 16:31:34 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -41,7 +41,7 @@ sub caparesponse_check {
     my $type=$LONCAPA::CAPAresponse_args{'type'};
     my $tol=$LONCAPA::CAPAresponse_args{'tol'};
     my $sig=$LONCAPA::CAPAresponse_args{'sig'};
-    my $ans_fmt=$LONCAPA::CAPAresponse_args{'ans_fmt'};
+    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'};
@@ -70,6 +70,12 @@ sub caparesponse_check {
 	$response=~s/ +/ /g;
     }
     if ($type eq 'float') { $response=~s/,//g; }
+    if ($type eq 'float' && $ans_fmt=~/\$/) {
+	if ($response!~/^\$/)  { return "NO_UNIT: Missing \$ "; }
+	$response=~s/\$//g;
+    }
+    $ans_fmt=~s/\W//g;
+
     if (length($response) > 500) { return "TOO_LONG: Answer too long"; }
 
     if ($type eq '' ) {
@@ -508,8 +514,8 @@ sub chemparse {
 	    }
 	    next;
 	}
-	$token =~ /^\s*(\d*)(.*)/;
-	$formula .= $1 if ($1 > 1);  # stoichiometric coefficient
+	$token =~ /^\s*(\d*(?:&frac\d\d)?)(.*)/;
+        $formula .= $1 if ($1 ne '1');  # stoichiometric coefficient
 	
 	my $molecule = $2;
 	# subscripts