random matrix diagonal problem

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yuval ohayon
yuval ohayon 2018-7-15
编辑： Jan 2018-7-15
hi,how can I generates random matrix (using rand command) that's only its diagonal is zeros im trying to something like this but it seems the syntax is wrong\
v=[0 0 0 0 0 ]
b=rand[5,5]
c=b(diag(v) ????
I want that "c" will be 5*5 matrix the numbers are random except the diagonal that should be zeroes thank :}

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回答（2 个）

Matt J
Matt J 2018-7-15
编辑：Matt J 2018-7-15
Here's another possibility. Its advantage is that it doesn't involve the creation of an additional matrix, although that would really only be important for larger matrix sizes.
c=rand(5);
c(1:6:end)=0;
Jan
Jan 2018-7-15
编辑：Jan 2018-7-15
Or:
c = rand(5,5) .* (1 - eye(5))
Matt J's method requires less arithmetic operations and is more powerful, because it allows to set the elements to any value.

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