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Access matrix location on one matrix with the data location on another matrix

Asked by Rohan Mehta on 21 Jun 2019
Latest activity Edited by madhan ravi
on 21 Jun 2019
I have two matrix say A & B if I have data stored in A and the data location of desired values in B how could I access Values of matrix A who are located at locations B.

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2 Answers

Answer by Chinmay Anand on 21 Jun 2019
 Accepted Answer

In case if A and B are vectors ,( 1 x n ) matrices
A(B) % It will give the values of A at indexes B

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I want to keep values of A on location B as it is and set all other to zero.
Thanks for the help....
idx = setdiff(1:length(A),B); % indexes which are not in B
A(idx) = 0;

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Answer by madhan ravi
on 21 Jun 2019

Probably you want:
idx = setdiff(1:numel(A),B);
A(idx) = 0;

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Beware this method works even if A is a matrix more than 1 dimension unlike the other.

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