Matrix rows and columns swapping
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I want to completely change rows and column simultaneously (please see the picture attached)
Is there a function which can do this?
Thanks,
Rakesh
2 commentaires
Logan Hall
le 24 Fév 2021
For anyone who is looking to swap an array:
Array = Array.';
btw sorry for reviving a dead thread.
Walter Roberson
le 24 Fév 2021
That does not solve the user's problem at all. The user needs the upper left corner (a 1 in their data) to go to the middle, but using .' would leave the upper left corner exactly where it is.
Réponses (3)
Walter Roberson
le 11 Nov 2019
There is no function that can do that simultaneously, at least not the first time.
For any given row and column exchange pattern, it is possible to pre-process the pattern so that doing the same exchange for multiple different arrays would take place simultaneously for that one matrix. Something like
temp = preprocess_exchange(rows_to_exchange, columns_to_exchange);
newA = A(temp);
newB = B(temp);
where preprocess_exchange is a function that would need to be written.
2 commentaires
Walter Roberson
le 12 Nov 2019
I should correct myself: you can do this with indexing.
>> A = [1 2 3;4 5 6;7 8 9]
A =
1 2 3
4 5 6
7 8 9
>> A([2 1 3],[2 1 3])
ans =
5 4 6
2 1 3
8 7 9
Akira Agata
le 12 Nov 2019
I don't think rows and column can be randomly changed simultaneously.
There should be at least 2 steps, like this:
% Input 3-by-3 matrix
A = reshape(1:9,3,3)';
% Randomize rows and columns
A = A(randperm(3),:);
A = A(:,randperm(3));
Franco Garcia
le 24 Fév 2022
Modifié(e) : Franco Garcia
le 24 Fév 2022
You can actually do that easily with just proper indexing. According to the example in the attachment:
A=[1,2,3;4,5,6;7,8,9] % The input in your example
B=A([2,1,3],[2,1,3]) % Your expected output
Regards!
1 commentaire
Walter Roberson
le 24 Fév 2022
I gave the indexing solution at https://www.mathworks.com/matlabcentral/answers/490529-matrix-rows-and-columns-swapping#comment_766334
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