How to convert from cell array to multidimensional array?

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Anton Filyayev
Anton Filyayev 2015-11-24
编辑： Christopher Crawford 2020-1-12
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.

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Andrei Bobrov
Andrei Bobrov 2015-11-24
A -your cell array [3 x 3].
Z = cellfun(@(x)reshape(x,1,1,[]),A,'un',0);
out = cell2mat(Z);
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Christopher Crawford
Christopher Crawford 2020-1-12
编辑：Christopher Crawford 2020-1-12
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

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