concatenate all cells in a celll array

Question

Newman 2016-7-17

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https://ww2.mathworks.cn/matlabcentral/answers/296084-concatenate-all-cells-in-a-celll-array

评论： Image Analyst 2016-7-17

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 ?

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Answer 1

Image Analyst 2016-7-17

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https://ww2.mathworks.cn/matlabcentral/answers/296084-concatenate-all-cells-in-a-celll-array#answer_228896

在 MATLAB Online 中打开

Try this:

ca = ca{:}

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Newman 2016-7-17

thanks

Image Analyst 2016-7-17

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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Answer 2

Azzi Abdelmalek 2016-7-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/296084-concatenate-all-cells-in-a-celll-array#answer_228899

编辑：Azzi Abdelmalek 2016-7-17

在 MATLAB Online 中打开

a=arrayfun(@(x) rand(256,1),ones(7),'un',0)
out=reshape(cell2mat(a),[],1)

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Azzi Abdelmalek 2016-7-17

Image Analyste I don't understand the thanks for what? but I agree with you that some choices are really incomprehensible!

Image Analyst 2016-7-17

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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