Creating combinations of 3 vectors

1 view (last 30 days)
Matt
Matt on 14 Nov 2018
Commented: Akira Agata on 14 Nov 2018
I have a 3x3 array
A = [50,20,30; 55,25,35; 60,30,40]
and want to produce the 27 combinations below. How can I do this?
Result = [50,20,30; 50,20,35; 50,20,40; 50,25,30; 50,25,35; 50,25,40; 50,30,30; 50,30,35; 50,30,40; 55,20,30; 55,20,35; 55,20,40; 55,25,30; 55,25,35; 55,25,40; 55,30,30; 55,30,35; 55,30,40; 60,20,30; 60,20,35; 60,20,40; 60,25,30; 60,25,35; 60,25,40; 60,30,30; 60,30,35; 60,30,40].
Thanks,
Matt

Accepted Answer

Akira Agata
Akira Agata on 14 Nov 2018
One possible solution would be like this:
A = [50,20,30; 55,25,35; 60,30,40];
[p1,p2,p3] = ndgrid(1:3);
Result = [A(p3(:),1),A(p2(:),2),A(p1(:),3)];

More Answers (1)

Guillaume
Guillaume on 14 Nov 2018
Akira's answer is how I'd do it. Just for the record here is another method
indices = dec2base(0:size(A, 1)^size(A, 2)-1, size(A, 1)) - '0' + 1 + (0:size(A, 2)-1)*size(A, 1);
A(indices)
Works for A up to 10 rows.
  1 Comment
Akira Agata
Akira Agata on 14 Nov 2018
What a coincidence!
Thank you for adding another solution :-)

Sign in to comment.

Categories

Find more on Resizing and Reshaping Matrices in Help Center and File Exchange

Products


Release

R2015a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!