How to randomly place ones in specified postions of a matrix?

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Muhammad Nabeel Hussain
评论： Muhammad Nabeel Hussain 2019-10-2
I have a matrix.
A=[ 0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0];
I have to randomly place specific number of ones say 8 or 10 in bold zeros positions.
Bold postions may change. Another problem is if i pick 10 positions in this matrix randomly. How to randomly place say 5 ones at those randomly selected 10 positions?
How to do this?

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2019-10-2
编辑：Andrei Bobrov 2019-10-2
1.
k = 10;
[m,n] = size(A);
[i1,j1] = ndgrid(1:m,1:2);
[i2,j2] = ndgrid(1:3,3:n);
ii = sub2ind([m,n], [i1(:);i2(:)],[j1(:);j2(:)]);
A(ii(randperm(numel(ii),k))) = 1;
2.
K = 10;
L = 5;
ii = randperm(numel(A),K);
A(ii(randperm(K,L))) = 1;

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