How permutate 2-by-2 matrices in a single matrix
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Peiman Khandar
on 28 Oct 2022
Edited: Peiman Khandar
on 29 Oct 2022
Hello everyone
I have three
matrices as:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/1172308/image.png)
a = [1,2;3,4]; b = [2,5;1,6]; c = [3,7;2,4];
and collect them in a single M matrix as, M = [a,b,c]. Now I want to have permutation of these three matrices in M_P matrix as:
M_P = [a b c;
a c b;
b a c;
b c a;
c a b;
c b a].
When I use M_P = perms(M), I could not obtain the [M_P] written above. it permutation all the value inside the matirices, however I just want permutation just matrices (a,b,c) then, place the values of matrices. I would appriciate it you can help me
Thanks in advance
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Accepted Answer
Bruno Luong
on 28 Oct 2022
a = [1,2;3,4]; b = [2,5;1,6]; c = [3,7;2,4];
abc= {a,b,c};
abc=perms(abc)
abc=cell2mat(abc)
3 Comments
Bruno Luong
on 29 Oct 2022
Take a look at cellfun
It's funny that you ask to create data in format that you don't know how to work with. It is better that you don't jump quickly and think more about the data structure that you know how to manipulate downstream.
Might be what you need is 4D array and not a 2D array of all permulations clump together.
More Answers (1)
Rik
on 28 Oct 2022
Edited: Rik
on 28 Oct 2022
You're close. You just need to store a, b, and c in a cell array and use perms to create indices.
The benefit of this approach is that you can extend it to more or fewer elements (although you will run into memory constraints fast with a larger number of matrices).
a = [1,2;3,4]; b = [2,5;1,6]; c = [3,7;2,4];
collation = {a,b,c};
inds = perms(1:numel(collation))
M_P = collation(inds)
M_P = cell2mat(M_P)
7 Comments
Bruno Luong
on 29 Oct 2022
a = [1,2;3,4]; b = [2,5;1,6]; c = [3,7;2,4];
abc= {a,b,c};
abc=perms(abc);
2*abc{1,1}
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