Non-zero column value

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Tha saliem 2017-6-8

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评论： Tha saliem 2017-6-9

采纳的回答： Image Analyst

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hi if have a matrix like this:

A=[1,0,0,0;0,1,1,1;0,0,1,0;0,0,1,1]

In this matrix i want to check that apart from diagonal values(1,1 & 2,2 etc.), if there are some other non-zero elements in the row then display that row's index. In A, it should display 2 and 4.

Thanks in advance.

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Image Analyst 2017-6-8

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Try eye(), any(), and find():

A=[1,0,0,0;0,1,1,1;0,0,1,0;0,0,1,1]
diagonalElements = logical(eye(length(A)))
% Make copy of A so we don't change 
% the original A (which could be bad).
Acopy = A;
% Set diagonal elements = 0.
Acopy(diagonalElements) = 0
rowsWith1s = find(any(Acopy, 2))