How can I speed up this function?

Fredrik P asked: 2024-01-16 performance , vectorization , MATLAB , Programming

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Expert Answer

Kshitij Singh answered . 2025-07-11 04:27:18

I doubt a vectorized solution would be faster than the loop, but here is one way to vectorize it.

[K,J,I]=ndgrid(1:n4,1:n1,1:n3);  %Recycle this, if possible

Bvals=B(sub2ind(size(B),K,J,I));

C=A(  sub2ind(size(A), J,Bvals,I ));

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