How do I convert a 2d matrix to a 3d matrix?

A(:,:,1) = ones(2,4);
A(:,:,2) = 2*ones(2,4);
A(:,:,3) = 3*ones(2,4);

C = [ones(2,4);2*ones(2,4);3*ones(2,4)];

In this post and this post, converting 3d matrix A to 2d matrix C is discussed.

However, how do I convert 2d matrix C back to 3d matrix A?

A(:,:,1) =

     1     1     1     1
     1     1     1     1


A(:,:,2) =

     2     2     2     2
     2     2     2     2


A(:,:,3) =

     3     3     3     3
     3     3     3     3
     
C =

     1     1     1     1
     1     1     1     1
     2     2     2     2
     2     2     2     2
     3     3     3     3
     3     3     3     3

Answer 1

[Akira Agata]

It's time to use reshape function! Please try the following:

A = reshape(C',[2,3,3]);

[Linjun He]

I modified the question. And now the answer from @Akira is

A = reshape(C',[2,4,3]);

It works well in this case.

Thank you!

Answer 2

[Linjun He]

Similarly, I find this works:

permute(reshape(C, 2, 3, 4), [1 3 2])

If you find answer from @Akira does not work in your case, you can refer to this answer :p

And this answer is from @Titus