How can I get elegantly an upper triangle random matrix (0 elsewhere)?

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cyril
cyril 2014-5-31
编辑： cyril 2014-5-31
I have seen the triu and tril functions, but I can't use them to set to 0:
A = rand(4);
tril(A)=0; % won't work
any idea, other than using 2 for loops?

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Andrei Bobrov
Andrei Bobrov 2014-5-31
编辑：Andrei Bobrov 2014-5-31
triu(A,1)

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