finding n maximum elements in a matrix
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Hi all, I have a symmetrical matrix of size mxm with diagonal elements equal to one. The values range [-1,1]. I would like to find five off the diagonal maximum elements in that matrix and return col and row indices. So far I have the following. It does not really work for values < 0. Any suggestions:
corrMat=rho - eye(size(rho));
A=corrMat;
sortedValues = unique(A(:));
maxValues = sortedValues(end-4:end);
3 个评论
Adam
2017-2-6
What aspect of it doesn't work for negative numbers? You mean you want -1 to be considered greater than -0.5?
the cyclist
2017-2-6
Also, do you want to select both the above- and below-diagonal instance of the maximal elements? Since the matrix is symmetric, there will always be pairs.
John Chilleri
2017-2-6
编辑：John Chilleri
2017-2-6
If you want to base "maximum" on magnitude, then perhaps insert an
A = abs(corrMat); % A = corrMat;
but this will fail with the unique function if there is an equivalent negative/positive value.
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2017-2-6
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