How to exchange a few rows randomly between matrices A and B (matrix B is selected randomly from a set of N matrices)?

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MANISH KUMAR 2017-1-16

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320561-how-to-exchange-a-few-rows-randomly-between-matrices-a-and-b-matrix-b-is-selected-randomly-from-a-s

重新打开： KSSV 2017-1-16

For example we have ‘ResultM’ which gives 5 matrices A, B, C, D, E and we have to exchange a few random rows between matrix A and any other matrix B selected randomly from these 5 matrices. First we select a matrix randomly from 5 matrices and then we select a few rows randomly and exchange rows between these matrices (matrix A and matrix selected randomly). Same process is followed for all the matrices of the set.

Eg.row exchange operation between matrix A and randomly selected matrix

then between matrix B and randomly selected matrix

then between matrix C and randomly selected matrix

then between matrix D and randomly selected matrix

then between matrix E and randomly selected matrix

A new random matrix is chosen for each row exchange operation.

For example we have matrix A

 A = [0     0     0     1     0     0     0    
      0     0     1     0     0     0     0     
      0     0     0     0     0     1     0     
      0     1     0     0     0     0     0
      0     0     0     0     0     0     1]    
And we randomly choose matrix D (say)
 D = [0     1     0     0     0     0     0
      1     0     0     0     0     0     0 
      0     0     0     1     0     0     0 
      0     0     0     0     1     0     0
      0     0     1     0     0     0     0]
Then we select a few rows randomly (say 2 and 4) and exchange.
The resulting matrices are
A = [0     0     0     1     0     0     0    
     1     0     0     0     0     0     0     
     0     0     0     0     0     1     0     
     0     0     0     0     1     0     0
     0     0     0     0     0     0     1]    
 D = [0     1     0     0     0     0     0
      0     0     1     0     0     0     0 
      0     0     0     1     0     0     0 
      0     1     0     0     0     0     0
      0     0     1     0     0     0     0]

Similarly, we perform row exchange operation for all the matrices of the set.

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Stephen23 2017-1-16

Duplicate question:

https://www.mathworks.com/matlabcentral/answers/319806-how-to-transfer-a-few-rows-randomly-from-a-matrix-a-to-other-matrices-of-the-set-of-n-matrices

KSSV 2017-1-16

@Stephen Cobeldick

I remember this question from Manish Kumar. I didn't close it and answered the question because there is an extra step involved in this present question. I thought it would be helpful for the user.

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Answer 1

KSSV 2017-1-16

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/320561-how-to-exchange-a-few-rows-randomly-between-matrices-a-and-b-matrix-b-is-selected-randomly-from-a-s#answer_250721

编辑：KSSV 2017-1-16

在 MATLAB Online 中打开

A = rand(5,7,5) ;   % your A,B,C,D and E matrices in 3D
A0 = A ;
[m,n,p] = size(A) ;
for i = 1:p
    idx = randperm(p,2) ;    % selecte two rows randomly 
    matrices = randperm(p,1) ; % select one matrix randomly 
    A(idx,:,matrices) = A(idx,:,i) ;  % replace random rows in selected matrix 
end