Make specific columns of a matrix zero.

García Rosado - 2021-10-09T11:40:49+00:00

Question: Make specific columns of a matrix zero.

Hi Mathworks community!   So I have a matrix A such as:   A = [1,2,3,4,5,6,7,8,9; 5,8,6,44,8,6,8,7,3; 9,8,7,6,5,4,3,2,1] And an array b that specifies the columns I' DON´T want to make zero: b = [1,4,5,9] Getting an output such as: out = [1,0,0,4,5,0,0,0,9; 5,0,0,44,8,0,0,0,3; 9,0,0,6,5,0,0,0,1] I'm working with much bigger dimensions so, Any ideas of how to do this efficiently?

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Expert Answer

Neeta Dsouza answered . 2025-11-20

A = [1,2,3,4,5,6,7,8,9; 5,8,6,44,8,6,8,7,3; 9,8,7,6,5,4,3,2,1];
b = [1,4,5,9];
out = zeros(size(A));
out(:,b) = A(:,b)

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