How to make a 31x31 matrix of zeros with 300 1's in random position

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Bilese 2022년 11월 17일

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https://kr.mathworks.com/matlabcentral/answers/1854123-how-to-make-a-31x31-matrix-of-zeros-with-300-1-s-in-random-position

댓글: Bilese 2022년 11월 17일

x1 = randi([0, 1], [31,31]); %random grid

I have this so far, but I want only 300 1's and not a random amount.

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Answer 1

DGM 2022년 11월 17일

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https://kr.mathworks.com/matlabcentral/answers/1854123-how-to-make-a-31x31-matrix-of-zeros-with-300-1-s-in-random-position#answer_1102898

편집: DGM 2022년 11월 17일

I'm sure this can be cleaned up, but here's one way.

sz = [31 31];
X = zeros(sz); % an array of zeros
X(1:300) = 1; % put 300 ones in there
X = reshape(X(randperm(prod(sz))),sz) % shuffle it
X = 31×31
     0     0     1     1     0     0     0     0     0     1     0     0     0     0     0     0     1     1     0     0     0     1     0     0     0     1     0     1     0     0
     1     0     0     0     0     0     1     0     0     0     0     0     0     0     0     0     0     0     0     1     0     1     0     1     0     1     0     1     0     0
     0     0     1     0     1     0     0     0     0     0     0     0     1     0     0     0     0     1     0     1     1     1     0     0     0     0     0     0     1     0
     0     0     1     1     0     0     1     0     1     0     1     1     0     0     0     0     0     1     1     1     1     0     0     0     0     1     0     1     0     1
     0     0     0     0     1     0     1     0     0     1     1     0     0     0     0     1     0     1     0     1     0     0     0     0     1     0     0     1     0     0
     0     0     1     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     0     1     1     0     1     0     0     1     1     0     0
     1     0     1     0     1     1     0     1     0     0     0     0     1     1     1     1     0     0     0     1     1     1     1     0     1     1     0     0     0     0
     0     0     0     0     0     1     0     1     1     1     0     0     0     0     1     0     0     0     0     0     0     0     0     1     0     0     1     0     1     1
     0     1     0     0     0     1     1     1     0     0     0     0     1     0     0     0     1     0     0     0     0     0     1     0     1     0     0     0     1     1
     0     0     0     0     0     0     0     0     1     0     1     1     0     1     1     0     0     1     0     0     0     0     0     0     0     1     0     0     1     0
nnz(X) % check number of nonzero elements
ans = 300