Bulk concatenation of cell array contents (without looping)?
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Hi,
I have a 1x4 cell whose elements are all 1x40 cells. Each of the elements of the 1x40 cells is a 1000x128 array of doubles.
Is there a way to concatenate the contents of the elements in the 1x40 cells into a 40000x128 array of doubles without looping through the elements individually?
Thanks, Alex
采纳的回答
Matt Fig
2011-4-23
There may be a way to do it with no loops, but I think this is fast anyway. Here is a full example. Just change the numbers according to your needs....
% Make a nested cell array, as you describe it.
for ii = 1:4 % A 1-by-4 cell
for jj = 1:3 % Each element is a 1-by-3 cell.
BC{ii}{jj} = rand(2,5); %#ok And each has is a 2-by-5 double
end
end
%
%
%
%
% Now extract it.
A = zeros(2*3,5,4);
for ii = 1:4
A(:,:,ii) = cat(1,BC{ii}{:});
end
A = reshape(permute(A,[1,3,2]),2*3*4,5);
更多回答（2 个）
Ramis Rafay
2017-7-23
0 个投票
I think this will work for any given number of elements without looping
stackedarrays = vertcat(mycell{:,:})
1 个评论
theblueeyeswhitedragon
2018-6-27
编辑：theblueeyeswhitedragon
2018-6-27
This gives you back a mxn matrix, which you could easily obtain by using cell2mat().
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