how to make a matrix elements randomly distributed

Question

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how to make a matrix m elements, which has n elements "one" or #0, randomly distributed, the remaining elements are zero (n<m).

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Answer 1

David Sanchez 2013-6-21

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Try this out (adapt the values to your needs):

m = 10;
n = 3;
pos = randperm(m*n,m);
M = zeros(m,n);
M(pos) = 1;

M =

M has the ones randomly distributed.

Jan 2013-6-21

And for older Matlab versions:

M   = zeros(m,n);
pos = randperm(m*n);
M(pos(1:n)) = 1;

Answer 2

Pham Ngoc Thanh 2013-6-21

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thanks a lot.