How to "partner" 2 matrixes

Question

Hugo Matias 2018-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/433059-how-to-partner-2-matrixes

评论： Guillaume 2018-12-2

采纳的回答： Guillaume

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The matrix X is randomly shuffled, how does Y follow up that shuffle?

i.e:

X=[4 7 1 9;
   3 0 6 8] 
Y=[32 6 4 21;
   77 89 0 2]

after the shuffle:

X=[3 9 4 6;
   1 7 8 0]         
Y=[77 21 32 0;
   4  6  2  89]

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Answer 1

Guillaume 2018-11-30

2
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https://ww2.mathworks.cn/matlabcentral/answers/433059-how-to-partner-2-matrixes#answer_349894

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X = [4 7 1 9;
     3 0 6 8] 
Y = [32 6 4 21;
     77 89 0 2]
newX = [3 9 4 6;
        1 7 8 0]
[found, where] = ismember(newX, X);
assert(all(found(:)), 'some elements of newX are not present in X')
newY = Y(where)

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Hugo Matias 2018-12-1

编辑：Guillaume 2018-12-2

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Hi, how do I do the same thing but instead of that this:

(imagine "a" as a number)

How do I do this?

X=[4 7 1 0;
   3 0 6 8] 
Y=[32 6 4 21;
   77 89 0 2]
X(X==0)=a;

after the alteration:

X=[4 7 1 a;
   3 a 6 8]    
Y=[ 32 6 4 a;
   77  a  0  2];

Guillaume 2018-12-2

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Keep the list of elements you're going to replace (i.e. the logical array X == 0) so that you can use for Y as well:

X=[4 7 1 0;
   3 0 6 8] 
Y=[32 6 4 21;
   77 89 0 2]
toreplace = X == 0;
X(toreplace) = a;
Y(toreplace) = a;

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Answer 2

madhan ravi 2018-11-30

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https://ww2.mathworks.cn/matlabcentral/answers/433059-how-to-partner-2-matrixes#answer_349861

编辑：madhan ravi 2018-11-30

在 MATLAB Online 中打开

X=[4 7 1 9;
   3 0 6 8] 
idx=randsample(1:numel(X),numel(X));
shuffled_X=reshape(X(idx),size(X,1),[])
Y=[32 6 4 21;
  77 89 0 2]
shuffled_Y=reshape(Y(idx),size(Y,1),[])

command window:

>> COMMUNITY
X =
     4     7     1     9
     3     0     6     8
shuffled_X =
     1     0     3     7
     8     9     4     6
Y =
    32     6     4    21
    77    89     0     2
shuffled_Y =
     4    89    77     6
     2    21    32     0
>> 