Log Message:
-----------
Make error messages more consistent when student's answer is off by a constant.
Modified Files:
--------------
pg/macros:
parserFormulaUpToConstant.pl
Revision Data
-------------
Index: parserFormulaUpToConstant.pl
===================================================================
RCS file: /webwork/cvs/system/pg/macros/parserFormulaUpToConstant.pl,v
retrieving revision 1.5
retrieving revision 1.6
diff -Lmacros/parserFormulaUpToConstant.pl -Lmacros/parserFormulaUpToConstant.pl -u -r1.5 -r1.6
--- macros/parserFormulaUpToConstant.pl
+++ macros/parserFormulaUpToConstant.pl
@@ -191,8 +191,12 @@
my $student = $ans->{student_value};
my $result = $ans->{correct_value} <=> $student; # compare encodes the reason in the result
$self->cmp_Error($ans,"Note: there is always more than one posibility") if $result == 2 || $result == 3;
- $self->cmp_Error($ans,"Your answer is not the most general solution")
- if $result == 1 || ($result == 3 && $self->removeConstant == $student);
+ if ($result == 3) {
+ $self->context->flags->set(no_parameters=>0);
+ $result = 1 if $self->removeConstant+"n01+n00x" == $student+"x"; # must use both parameters
+ $self->context->flags->set(no_parameters=>1);
+ }
+ $self->cmp_Error($ans,"Your answer is not the most general solution") if $result == 1;
$self->cmp_Error($ans,"Your formula should be linear in the constant '$student->{constant}'")
if $result == -1 && $self->getFlag("showLinearityHints") && !$student->D($student->{constant})->isConstant;
}
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