all possible combinations of three vectors

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Rogier Busscher
Rogier Busscher el 24 de Mayo de 2017
Comentada: Bruno Luong el 22 de Abr. de 2021
I am trying to find all possible combinations of three vectors (A,B,C). For this, I tried using combvec. However, the result gets me a 1281x1 double, while i expected a matrix of 546*33*649 possibilities.
What i would like to get is:
A: 1,5,6,9,12
B: 1,2,3,4,5,6
C: 3,18,27,69,72
Ans:
1,1,3
1,1,18
1,1,27
etc.
So how do i do this?

Respuesta aceptada

Guillaume
Guillaume el 24 de Mayo de 2017
One possible way, which doesn't require any toolbox:
[ca, cb, cc] = ndgrid(A, B, C);
combs = [ca(:), cb(:), cc(:)]
  5 comentarios
Abdelmajid Ben yahya
Abdelmajid Ben yahya el 22 de Abr. de 2021
Hi,
I have an additional question, if i may.
Is it possible to get all combinations that fulfil a certain constraint? Let's say that within the combination A+B+C<=4.
Thank you.
Bruno Luong
Bruno Luong el 22 de Abr. de 2021
Just filter out those are not meet the constraints, or you can use this FEX to get directly the combination
allVL1(3,4,'<=')
ans =
0 0 0
0 0 1
0 1 0
1 0 0
0 0 2
0 1 1
0 2 0
1 0 1
1 1 0
2 0 0
0 0 3
0 1 2
0 2 1
0 3 0
1 0 2
1 1 1
1 2 0
2 0 1
2 1 0
3 0 0
0 0 4
0 1 3
0 2 2
0 3 1
0 4 0
1 0 3
1 1 2
1 2 1
1 3 0
2 0 2
2 1 1
2 2 0
3 0 1
3 1 0
4 0 0

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Azzi Abdelmalek
Azzi Abdelmalek el 24 de Mayo de 2017
A=[1,5,6,9,12]
B= [1,2,3,4,5,6]
C= [3,18,27,69,72]
[ii,jj,kk]=meshgrid(A,B,C);
ii=permute(ii,[1 3 2]);
jj=permute(jj,[2 1 3])
kk=permute(kk,[3 2 1])
out=[ii(:) jj(:) kk(:)];

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