What you suggest would be nice, but really the instructor's answer
should be good. Otherwise WW will have to hunt for its domain, so I
think it is reasonable to expect problem writers to provide a valid
domain if there is a risk that the default will not work.
On the other hand, I don't think WW should say "Error" to a student
when it cannot evaluate the student answer at a sample value. For
example, if the answer is sqrt(1-x) and a student enters sqrt(x-1), WW
error: Can't take sqrt of -0.742.We already have students thinking that WW can't handle the way
they enter their answers. In this example, the answer may be wrong but
it is syntactically ok, so students are mislead by the message. I think
that the error should be considered internal to WW and the student
should just be told that the answer is incorrect.
Error detected evaluating student input at (0.2580000484 )
Has this been changed in 1.9 or 2.0?
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