Switch signs to positive in the diagonal of a matrix

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Jonas
Jonas 2022-11-21
评论： Jonas 2022-11-21
Hi
So I have an already existing 6x6 matrix, but I would like to make sure that the diagonals are all positive.
Thus, how do I transform/replace the diagonal of my matrix to be all positive?
I have tried to seach for, how to replace the diagonal with a vector, but without luck.
If I could replace the original diagonal with the absolute diagonal, this would also do it.

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采纳的回答

David Hill
David Hill 2022-11-21
Ran in:
m=randi(10,6)-5
m = 6×6
0 2 1 2 5 -3 1 -3 1 -1 5 -2 4 1 -4 2 4 -1 -3 2 1 -4 2 -2 3 5 3 1 5 4 3 5 5 -2 5 0
d=abs(diag(m));
M=m.*~eye(size(m))+diag(d)
M = 6×6
0 2 1 2 5 -3 1 3 1 -1 5 -2 4 1 4 2 4 -1 -3 2 1 4 2 -2 3 5 3 1 5 4 3 5 5 -2 5 0

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