How to inverse matrix 128*6 in matlab?

2 views (last 30 days)
I want to inverse my matrices 128*6 into 6*128.

Accepted Answer

Highphi
Highphi on 9 Feb 2022
u = [1, 1; ...
2, 2; ...
3, 3];
uInverse = flip(u)
uInverse = 3×2
3 3 2 2 1 1
u = [1, 1; ...
2, 2; ...
3, 3];
u90 = rot90(u)
u90 = 2×3
1 2 3 1 2 3
u_neg90 = rot90(u, 3)
u_neg90 = 2×3
3 2 1 3 2 1
  1 Comment
DGM
DGM on 9 Feb 2022
Edited: DGM on 9 Feb 2022
Using an asymmetric input allows some distinctions to be made. If the OP is trying to do linear algebra, transposition is probably what's intended.
u = [1, 4; ...
2, 5; ...
3, 6];
u_90 = rot90(u) % rotate 90
u_90 = 2×3
4 5 6 1 2 3
u_neg90 = rot90(u, 3) % rotate -90 (or 270)
u_neg90 = 2×3
3 2 1 6 5 4
u_tpose = u.' % transpose
u_tpose = 2×3
1 2 3 4 5 6
Note that transposition is a special case of permutation that only applies to 2D arrays. More generally, you can do:
u_tpose = permute(u,[2 1])
u_tpose = 2×3
1 2 3 4 5 6

Sign in to comment.

More Answers (0)

Categories

Find more on Operators and Elementary Operations in Help Center and File Exchange

Community Treasure Hunt

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

Start Hunting!