Specify number of ones in each row and column in binary matrix

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high speed
high speed 2021-4-3
评论： high speed 2021-4-3
I want create random binary matrix of dimensions 972x1944 that contain 3 ones in each column and 6 ones in each row.
How can I do that please

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Matt J
Matt J 2021-4-3
A=kron(eye(324),ones(3,6));
A=A(randperm(972), randperm(1944));

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