How to convert from cell array to multidimensional array?

I have a cell array that is 3x3 with each cell containing a vector of (1x1024). It is essentially the same as a 3x3 matrix with a dimension of 1024. How can I convert from cell array to multidimensional array that has these dimensions of (3,3,1024)? I tried cell2mat, but it simply concatenates them into a 3x3072 matrix.

Answer 1

[Andrei Bobrov]

A -your cell array [3 x 3].

Z = cellfun(@(x)reshape(x,1,1,[]),A,'un',0);
out = cell2mat(Z);

[Anton Filyayev]

This worked beautifully, thanks!!

[Christopher Crawford]

To do the same for a cell array A of arbitrary ndarrays, replace [] with size(x):

B=cell2mat(cellfun(@(x)reshape(x,[1,1,size(x)]),A,'un',0))

which creates an array 2 dimensions higer than that of the cells of A.

To only add one dimension for row or collumn cell arrays (and none for a singleton cell array):

C=reshape(B,[size(A)(size(A)~=1),size(A{1})])

https://stackoverflow.com/questions/23703419/squeeze-some-of-singleton-dimensions-in-matlab

or permute the ndarray dimensions ahead of the cell array dimensions:

C=permute(B,[3:ndims(B),1:2])

https://stackoverflow.com/questions/23703419/squeeze-some-of-singleton-dimensions-in-matlab