[WWcvs] pg: BACKPORT: Demote Real() results of Formula() evaluations to standard Perl reals.

[dpvc v. a. <we...@ma...>]

Log Message:
-----------
BACKPORT:  Demote Real() results of Formula() evaluations to standard
Perl reals.  (Makes graphing more efficient.)

Tags:
----
rel-2-4-patches

Modified Files:
--------------
    pg/macros:
        PGgraphmacros.pl

Revision Data
-------------
Index: PGgraphmacros.pl
===================================================================
RCS file: /webwork/cvs/system/pg/macros/PGgraphmacros.pl,v
retrieving revision 1.6.6.1
retrieving revision 1.6.6.1.2.1
diff -Lmacros/PGgraphmacros.pl -Lmacros/PGgraphmacros.pl -u -r1.6.6.1 -r1.6.6.1.2.1
--- macros/PGgraphmacros.pl
+++ macros/PGgraphmacros.pl
@@ -323,10 +323,9 @@
 			my $localContext= Parser::Context->current(\%main::context)->copy;
 			$localContext->variables->add($var=>'Real') unless $localContext->variables->get($var);
 			my $formula = Value->Package("Formula()")->new($localContext,$rule);
-        	my $subRef = sub {my $x=shift; Parser::Evaluate($formula, $var=>$x)}; 
+			my $subRef = sub {my $x=shift; Parser::Evaluate($formula, $var=>$x)->value};
         	     #traps errors when 
         	     # graph domain is larger than the function's domain.
-    
         	#my $subRef    = string_to_sub($rule,$var);
 			my $funRef = new Fun($subRef,$graph);
 			$funRef->color($color);