Change a 3D matrix to a stacked 2D matrix

I have a matrix of (5*5*14680) dimensions, basically 14680 of five by five matrices, I need to convert this output to a 2D matrix (I believe) so basically all the rows are stacked up, and the new matrix dimension will then be : 73400*5. I tried this out = reshape(permute(in, [1:14680]), [], 5); but the output matrix was did not seem correct, everything was out of order. Any suggestions? Please.

Answer 1

[Guillaume]

Your permute does not make much sense and implies that there are 14680 dimensions instead of three. Since all the dimensions are listed ordered, it actually does not swap any of them. Here is the way to do it with reshape:

out = reshape(permute(in, [2 1 3]), size(in, 2), [])'

You need to transpose rows and columns before and after the reshape since matlab operates column-wise.

If thinking in terms of reshape and permute hurts your head (it does for me), it is simpler to go through a cell array and plain concatenation. The downside is speed:

out = num2cell(in, [1 2]); %split into cell array keeping dimensions 1 and 2 together
out = vertcat(out{:}) %concatenate all the cells vertically

Answer 2

[Azzi Abdelmalek]

out=reshape(permute(a,[2 1 3]),size(a,2),[])'

[Amine Ben Ayara]

Azzi, I do not understand what the [2 1 3] are actually specifying? I do not want the order of my rows to change at all from the original matrix. this will not affect my order, right? Thank you

[Azzi Abdelmalek]

Look at the final result, not just the intermediate!