How to add a diagonal to a matrix?

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Nadia_Ny635
Nadia_Ny635 2020-9-4
评论： Matt J 2020-9-4
I have the following matrix M=[1 2 3; 4 5 6 ] and I would like to transform it to the follwowing matrix M=[0 1 2; 3 0 4; 5 6 0].
How to do it? It is how to add a zero diagonal to a predefined matrix?

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回答（1 个）

Matt J
Matt J 2020-9-4
编辑：Matt J 2020-9-4
One way,
[J,I]=ndgrid(1:size(M,1)+1);
idx=(I~=J);
M = accumarray([I(idx),J(idx)],reshape(M.',[],1))
M =
0 1 2
3 0 4
5 6 0
  2 个评论
Matt J
Matt J 2020-9-4
You're quite welcome, but please Accept-click the answer if it resolves your question.

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