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Topic: Random matrix of 0s and 1s with two not trivial constraints
Replies: 1   Last Post: Jun 23, 2013 4:54 AM

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Bruno Luong

Posts: 8,711
Registered: 7/26/08
Re: Random matrix of 0s and 1s with two not trivial constraints
Posted: Jun 23, 2013 4:54 AM
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K = 30;
k = 4;
N = 10000;
C = nchoosek(K,k);
if N > C
error('not possible')
end
itab = randperm(C,N);

J = nchoosek(1:K,k);
J = J(itab,:);

I = repmat((1:N)', [1 k]);
a = accumarray([I(:) J(:)], 1);

% Bruno



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