delete all zero columns and the same columns in another matrix

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Qian cao
Qian cao on 22 Dec 2015
Commented: Qian cao on 22 Dec 2015
Hi all, I have two simplified matrixes that I need to cope with. A=[0 1 0 1;0 4 0 1; 0 3 0 0; 0 1 0 2 ]; How I delete the columns in A with all zeros please? So the deleted columns should be col 1 and 3. AND! How to delete the same columns( indexed from A?) in B=[2 1 7 1;1 4 2 1; 1 3 6 6; 0 1 6 2 ]; So, col 1 and 3 are also deleted. I know I can use indexes to make it but my function is kind of too complexed...Wish you a nice Christmas day!!!

Accepted Answer

Ingrid
Ingrid on 22 Dec 2015
You could try something like this
zerosLocations = ~A;
idx = (sum(zerosLocations) == size(A,1));
A(:,idx) = [];
B(:,idx) = [];

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