## WeBWorK Problems

### Re: Lists of Vectors answer checker

by Davide Cervone -
Number of replies: 0
You can use
    ANS(Compute(",")->cmp(checker => sub {
my ($correct,$student,$ans) = @_; return$correct->isParallel(\$student);
}));

to get a list of vectors where the student can enter parallel vectors. This uses a custom checker for the individual entries in the list which returns true when the student answer is parallel to the correct one.

I believe that there is a special basic_cmp in pg/macros/PGmorematrixmacros.pl that might do what you need, though it is not MathObject based. See the POD documentation for that macro file for details.

Davide