Hi. I have a two-dimensional array Z of size 10x15, and two vectors, A = [1 2 4] and B = [3 2 1]. Using A and B, I want to access the following elements in Z: Z(1,3), Z(2,2), Z(4,1) only

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Ammar Gharaibeh
Ammar Gharaibeh 2017-11-21
编辑： Stefano Francavilla 2017-11-21
Hi. I have a two-dimensional array Z of size 10x15, and two vectors, A = [1 2 4] and B = [3 2 1]. Using A and B, I want to access the following elements in Z: Z(1,3), Z(2,2), Z(4,1) only. I tried using Z(A,B) but this will give me all combinations of elements (i.e. Z(1,3), Z(1,2), Z(1,1), Z(2,3), ...). Any idea how to do this.

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Stefano Francavilla
Stefano Francavilla 2017-11-21
编辑：Stefano Francavilla 2017-11-21
I think you get a submatrix where the elements you are looking for are in the main diagonal: use diag(Z(A,B))

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Andrei Bobrov
Andrei Bobrov 2017-11-21
out = Z(sub2ind(size(Z),A,B))

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