How to convert from cell array to multidimensional array?

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Chandrama Sarker 2017-7-24

1
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https://ww2.mathworks.cn/matlabcentral/answers/349942-how-to-convert-from-cell-array-to-multidimensional-array

评论： Chandrama Sarker 2017-7-24

I have a cell array that is 1x10,000 with each cell containing a multidimensional array of (7x7x6). How can I convert from cell array to multidimensional array that has a dimensions of (7,7,6,10000)?

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Answer 1

per isakson 2017-7-24

2
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https://ww2.mathworks.cn/matlabcentral/answers/349942-how-to-convert-from-cell-array-to-multidimensional-array#answer_275257

编辑：per isakson 2017-7-24

在 MATLAB Online 中打开

Loops are allowed if one remember to pre-allocate

num = nan( 7, 7, 6, 10000 );
for jj = 1 : 10000
    num(:,:,:,jj) = C{jj}; 
end

and they are fast enough

>> cssm
Elapsed time is 0.048869 seconds.
Elapsed time is 0.037956 seconds.
ans =
     1

where cssm is

m = randn( 7,7,6 );
C = repmat( {m}, [1,10000] );
tic
num = nan( 7, 7, 6, 10000 );
for jj = 1 : 10000
    num(:,:,:,jj) = C{jj}; 
end
toc
tic
n02 = cat( 4, C{:} );
toc
all( num(:)==n02(:) )