How can I make 80 percent of the matrix values equal to zeros, randomly?

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Khan 2021-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/866720-how-can-i-make-80-percent-of-the-matrix-values-equal-to-zeros-randomly

评论： KSSV 2021-6-28

I have a matrix A (30 by 20). I want to generate three random matrices, each containing 20 percent of the orgional matrix. In other words, I want to replace 80 percent values of A matrix to zeros but randomly. Thank you

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KSSV 2021-6-28

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https://ww2.mathworks.cn/matlabcentral/answers/866720-how-can-i-make-80-percent-of-the-matrix-values-equal-to-zeros-randomly#answer_734840

编辑：KSSV 2021-6-28

在 MATLAB Online 中打开

A = rand(30,20);   % Matrix for demo 
B = A ; 
idx = randperm(numel(A),round(numel(A)*80/100)) ; % get 80% of indices randomly 
B(idx) = 0 ;  % replace with zero 