Understanding output of perfcurve

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Nirmal on 26 Oct 2012
[X,Y,T,AUC2,OPTROCPT] = perfcurve(classtest,classpredict,2);
My classtest as well as classpredict are 460*1, but when i run perfcurve i get x 3*1 and so it y.
I do not understand why is it so. As X,Y are used to draw ROC, I think it should give both of them as 460*1. I must be missing something.
Thank you for your time.

Accepted Answer

Tom Lane
Tom Lane on 27 Oct 2012
Could it be that you have relatively few distinct values of classpredict?
  1 Comment
Nirmal on 27 Oct 2012
Thank you! i really didnt think it through.

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