how to insert diganole of zeros in to matrix without using loops ?

my question is simple how to change the main diagonel of nXn of random numers and change the main diagonle to zeroes ?

without using loops ?

Answer 1

[madhan ravi]

a(logical(eye(size(a,1))))=0 % where a is your matrix

[tomer polsky]

thank you for your help but why did you use the logical command ?

[madhan ravi]

logical indexing

Alternative (faster):

a(1:size(a,1)+1:end)=0