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optimize my matrix function

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this is my code:
for j=k_indices
knn_labels(t,1) = classifier.Ytrain(j,1);
t = t+1;
what I'm doing here is using a vector of indices to create a vector of the values at those indices using some other matrix:
But, I am sure that there is some pretty one liner that does this. Any one knows what that line looks like?
Thank you

Accepted Answer

Walter Roberson
Walter Roberson on 7 Nov 2020
knn_labels = reshape( classifier.YTrain(k_indices), [], 1);

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