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sample from data according to a class with no replacement

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MA
MA 2019-9-25
回答： MA 2019-9-25
Lets say that I have a matrix n*m where n represented the instances while m representing the attributes. I have another column vector which is n*1 where n represents the classes corresponding to the enstances of the matrix n*m. Now, I want to sample from the matrix n*m based on the classes vector n*1. So, that for instance I want K instances with no replacement belonging to the class L. Any one could help me in that.

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MA
MA 2019-9-25
I just solve it. So, for anyone who is looking for an answer, it is the following:
new_sample= datasample(X(T==L,:),K,'replace',false);

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