Can I define or change the direction of 'reshape'?

Hi,

I have a sample image (below).

Generally if I use 'reshape' to change the RGB from n by m by 3 to n*m by 3, the reshape process goes vertically (in the direction of A), meaning the pixel at 1st row and 1st column is followed by the pixel at 2nd row and 1st column.

How can I define 'reshape' (or whether it is possible) so that the reshape goes horizontally (in the direction of B), meaning the pixel at 1st row and 1st column is followed by the pixel at 1st row and 2nd column?

Answer 1

[John D'Errico]

No. You cannot do so. You cannnot change how reshape works.

HOWEVER. Nothing stops you from changing that afterwards. For example...

V = 1:16;
Vr = reshape(V,[4 4])

Vr = 4×4

1 5 9 13 2 6 10 14 3 7 11 15 4 8 12 16

So down the columns. That is how reshape works. And you cannot change it.

Vr = Vr'

Vr = 4×4

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

But now acrross the rows.

You can also use permute for arrays in higher dimensions.

[Salad Box]

That really helps. Thank you!