How can I get the diagonal elements of a matrix to be 0's

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A123456
A123456 2016-1-6
评论： dpb 2016-1-8
How can I get the diagonal elements of a matrix to have all 0's and 1's everywhere else?

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Walter Roberson
Walter Roberson 2016-1-6
x = ones(N) - eye(N)

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dpb
dpb 2016-1-6
x=~eye(N);
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Walter Roberson
Walter Roberson 2016-1-7
I would probably use +0 as well, but writing double() explicitly is clearer to people about what is being done and why. People tend to expect that adding 0 will leave everything unchanged...
dpb
dpb 2016-1-8
In the forum if I'd bothered to do the conversion I'd've added a comment on the purpose. As was, I figured the expression alone did satisfy the question and the remainder could be "exercise for the student"...

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