concatenate all cells in a celll array

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Newman
Newman on 17 Jul 2016
Commented: Image Analyst on 17 Jul 2016
hello i have a cell array 7x7
Columns 1 through 6
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
[256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double] [256x1 double]
Column 7
[256x1 double]
[256x1 double]
[256x1 double]
[256x1 double]
[256x1 double]
[256x1 double]
[256x1 double]
I want to concatenate all t he cells in this cell array to a 7x7x256=12544x1 vector how do i do that ?

Accepted Answer

Image Analyst
Image Analyst on 17 Jul 2016
Try this:
ca = ca{:}
  4 Comments
Image Analyst
Image Analyst on 17 Jul 2016
You're welcome, though you should really not even use cell arrays in the first place. They are for using mixed data types (though this has been supplanted by the new "table" data type in most cases), or for arrays of strings of different lengths. They were not meant for arrays of simple numerical arrays, which could be handles by a simple 2D numerical array in your case.

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More Answers (1)

Azzi Abdelmalek
Azzi Abdelmalek on 17 Jul 2016
Edited: Azzi Abdelmalek on 17 Jul 2016
a=arrayfun(@(x) rand(256,1),ones(7),'un',0)
out=reshape(cell2mat(a),[],1)
  3 Comments
Image Analyst
Image Analyst on 17 Jul 2016
Well, you used reshape() and I did the "for" loop. While a for loop might be easier for beginners to understand, reshape() is possibly the more "MATLAB-ish" way to do it. And it can be complicated/confusing to figure out when to use brackets, braces, and parentheses with cell arrays, even for us experienced people that's why I recommend beginners to avoid them if they can.

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