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eliminating some elements randomly from a matrix

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may
may 2013-10-8
关闭： MATLAB Answer Bot 2021-8-20
Suppose that I have a Matrix A and I want to eliminate k elements randomly from each column (1<=k<size(A,1))
so the remaining matrix, A' , would have the size equal to:
size(A',1)=size(A,1)-k, size(A',2)=size(A,2)
How can I do this? Thank you.

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回答（1 个）

Honglei Chen
Honglei Chen 2013-10-8
A = magic(5)
k = 2;
[M,N] = size(A);
ridx = zeros(k,N);
for m = 1:N
ridx(:,m) = randperm(M,k);
end
cidx = repmat(1:N,k,1);
B = A;
B(sub2ind([M N],ridx(:),cidx(:)))=[];
reshape(B,M-k,[])

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