UsingWW: Can't generate enough valid points for comparison

WeBWorK Problems

Can't generate enough valid points for comparison

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Hi all,

I get "Can't generate enough valid points for comparison"

I don't know what is wrong with my code.

Pls see attached.

Thanks, Anton

by Danny Glin - Wednesday, 11 July 2012, 6:34 PM

This means that the system can't find any x-values to substitute where the expression would be defined.

In your example, the domain of $ans is [0,1], so all of your test points are outside of this domain.

There are a couple ways to fix this:

Replace your test points with values between 0 and 1
Replace "test_points=>..." with "limits=>[0,1]", which would force WeBWorK to choose x-values between 0 and 1 for evaluation.

There is more info about domains and such at http://webwork.maa.org/wiki/FormulaDomain1

Danny

by Anton Betten - Thursday, 12 July 2012, 8:09 AM

Hi Danny,

thanks for the reply. limits=>[2,10] does the trick.

Best wishes, Anton

by Danny Glin - Thursday, 12 July 2012, 1:23 PM

Yeah, I clearly didn't get enough sleep yesterday. x>1 seems like the correct domain.