--- loncom/homework/default_homework.lcpm	2004/05/27 03:46:02	1.83
+++ 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 1.83 2004/05/27 03:46:02 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 '' ) {
@@ -106,17 +112,8 @@ sub caparesponse_check {
 	}
     }
 
-    if ($sig eq '') {
-	$sig_lbound = 0; #SIG_LB_DEFAULT
-	$sig_ubound =15; #SIG_UB_DEFAULT
-    } else {
-	($sig_lbound,$sig_ubound) = split /,/,$sig;
-	if (!defined($sig_lbound)) {
-	    $sig_lbound = 0; #SIG_LB_DEFAULT
-	    $sig_ubound =15; #SIG_UB_DEFAULT
-	}
-	if (!defined($sig_ubound)) { $sig_ubound=$sig_lbound; }
-    }
+    ($sig_ubound,$sig_lbound)=&LONCAPA_INTERNAL_get_sigrange($sig);
+
     my $reterror="";
     my $result = &caparesponse_capa_check_answer($response,$answer,$type,
 						 $tol_type,$tol,
@@ -242,7 +239,10 @@ sub random {
     if ( ! $hidden::RANDOMINIT ) {
 	if ($external::randomseed == 0) { $external::randomseed=1; }
 	if ($external::randomseed =~/,/) {
-	    my ($num1,$num2)=split(/,/,$seed);
+	    my ($num1,$num2)=split(/,/,$external::randomseed);
+	    &random_set_seed(1,abs($num1));
+	} elsif ($external::randomseed =~/:/) {
+	    my ($num1,$num2)=split(/:/,$external::randomseed);
 	    &random_set_seed(abs($num1),abs($num2));
 	} else {
 	    &random_set_seed(1,int(abs($external::randomseed)));
@@ -350,7 +350,7 @@ sub random_multivariate_normal {
     my ($item_cnt,$seed,$mean,$covar) = @_;
     my @oldseed=&random_get_seed();
     &random_set_seed_from_phrase($seed);
-    @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar);
+    my @retArray=&math_random_multivariate_normal($item_cnt,@$mean,@$covar);
     &random_set_seed(@oldseed);
     return @retArray;
 }
@@ -360,7 +360,7 @@ sub random_multinomial {
     my @oldseed=&random_get_seed();
     my @retArray;
     &random_set_seed_from_phrase($seed);
-    @retArray=&math_random_multinomial($item_cnt,@p);
+    my @retArray=&math_random_multinomial($item_cnt,@p);
     &random_set_seed(@oldseed);
     return @retArray;
 }
@@ -514,8 +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
@@ -529,7 +529,7 @@ sub chemparse {
 	$formula .= $molecule.' ';
     }
     # get rid of trailing space
-    $formula =~ s/(\Q${nbsp}\E| )$//;
+    $formula =~ s/(\&nbsp\;| )$//;
     
     return &xmlparse($formula);
 }
@@ -541,7 +541,7 @@ sub prettyprint {
     if ($fmt =~ /chem/i) { return(&chemparse($value)); }
     my ($dollarmode,$commamode,$alwaysperiod,$options);
     if ($fmt =~ /^([^\d]*)(.*)/) { $options=$1; $fmt=$2; } 
-    if ($options =~ /\$/) { $dollamode=1; }
+    if ($options =~ /\$/) { $dollarmode=1; }
     if ($options =~ /,/)  { $commamode=1; }
     if ($options =~ /\./) { $alwaysperiod=1; }
     if ($fmt) { $value=sprintf('%.'.$fmt,$value); }
@@ -574,8 +574,8 @@ sub prettyprint {
 	}
     } else {
 	$result=$value;
-	if ($dollarmode) { $result=&dollarformat($result,$target); }
-	if ($commamode) { $result=&commaformat($result,$target); }
+	if    ($dollarmode) { $result=&dollarformat($result,$target); }
+	elsif ($commamode)  { $result=&commaformat($result,$target); }
     }
     return $result;
 }