How to inverse matrix 128*6 in matlab?

I want to inverse my matrices 128*6 into 6*128.

Answer 1

[HighPhi]

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

[DGM]

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