How to select two matrices randomly from a set of N matrices and then randomly select a few rows from first selected matrix and then exchange with corresponding rows of other selected matrix.

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MANISH KUMAR 2016-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/309032-how-to-select-two-matrices-randomly-from-a-set-of-n-matrices-and-then-randomly-select-a-few-rows-fro

评论： Andrei Bobrov 2016-10-25

For example we have 10 matrices A,B,C,D,E,F,G,h,I,J and we select randomly two matrices C and H. And then Randomly select any two rows from C and exchange with corresponding rows of H.

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Answer 1

Thorsten 2016-10-25

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编辑：Thorsten 2016-10-25

在 MATLAB Online 中打开

Q = cat(3,A,B,C,D,E,F,G,H,I,J);
kk = randperm(size(Q, 3), 2); % select 2 matrices from Q
ii = randperm(size(Q, 1), 2); % select 2 rows
Q(ii, :, kk) = Q(ii, :, fliplr(kk));

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Answer 2

Andrei Bobrov 2016-10-25

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在 MATLAB Online 中打开

For the case where the matrices have the same size:

Q = cat(3,A,B,C,D,E,F,G,H,I,J);
ii = [3,8] % C and H
n = size(Q,1);
z = 1:n;
jj = z(randperm(n,2));
M = Q(:,:,ii);
M(jj,:,:) = M(jj,:,end:-1:1);
Q(:,:,ii) = M;