MATLAB: Obtain row and column indices of non-zero matrix elements

findind2sub

Is there a more efficient way of obtaining the row and column indices of the nonzero elements of a matrix than using the ind2sub and find functions? [I,J] = ind2sub(size(A),find(A));

Best Answer

Of course, there is, use the two output version of find:

[row, col] = find(A)

Related Solutions

MATLAB: Find matching indexes

Index_find = find(ismember(A,B));

MATLAB: Non-zero column value

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))

Best Answer

Related Solutions

MATLAB: Find matching indexes

MATLAB: Non-zero column value

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