--- loncom/homework/edit.pm	2011/11/19 13:45:36	1.137
+++ loncom/homework/edit.pm	2011/11/22 02:13:37	1.138
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA 
 # edit mode helpers
 #
-# $Id: edit.pm,v 1.137 2011/11/19 13:45:36 www Exp $
+# $Id: edit.pm,v 1.138 2011/11/22 02:13:37 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -444,6 +444,20 @@ sub insert_functionplotvectorsumrule {
 <functionplotvectorsumrule />';
 }
 
+sub insert_functionplotcustomrule {
+    return '
+<functionplotcustomrule>
+<answer type="loncapa/perl">
+# &fpr_val("label"), &fpr_f($x), &fpr_dfdx($x), &fpr_d2fdx2($x)
+# ($xs,$xe,$ys,$ye)=&fpr_vectorcoords("Name"), ($x,$y)=&fpr_objectcoords("Name")
+# &fpr_vectorlength("Name"), &fpr_vectorangle("Name")
+ 
+# Return 0 or 1
+return 1;
+</answer>
+</functionplotcustomrule>';
+}
+
 sub insert_functionplotruleset {
     return '
 <functionplotruleset>