concatenate two cells of different dimention into a single array

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navan 2016-6-7

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https://ww2.mathworks.cn/matlabcentral/answers/288243-concatenate-two-cells-of-different-dimention-into-a-single-array

评论： Star Strider 2016-6-7

采纳的回答： Star Strider

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I have three cells

so for example

Cell1 is 1x3  that is {1;1;1}
Cell2 is 3x2  that is {2,2;3,3;4,4}
Cell3 is 1x2   that is {1;1}

I want to concatenate all these cells into a single array so that i can see the results as

2  2  1
3  3  1
4  4

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Answer 1

Star Strider 2016-6-7

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https://ww2.mathworks.cn/matlabcentral/answers/288243-concatenate-two-cells-of-different-dimention-into-a-single-array#answer_224735

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This works:

Cell1 = {1;1;1};
Cell2 = {2,2;3,3;4,4};
Cell3 = {1;1};
Cell3{3} = [];                                  % Add Empty Element To End Of ‘Cell3’
Result = cat(2, Cell1, Cell2, Cell3)
Result = 
    [1.0000e+000]    [2.0000e+000]    [2.0000e+000]    [1.0000e+000]
    [1.0000e+000]    [3.0000e+000]    [3.0000e+000]    [1.0000e+000]
    [1.0000e+000]    [4.0000e+000]    [4.0000e+000]               []

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navan 2016-6-7

Dear Star Strider, Thanks a lot for your help. Is there any other way than not including empty element. I have many cells like this which is varying in their rows and columns size. So adding blank element will be quite difficult.

Star Strider 2016-6-7

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My pleasure.

I am not aware of any way to do what you want without adding an empty element. All the rows and columns have to be equal. You can make it more general with something like this:

Cell1 = {1;1;1};
Cell2 = {2,2;3,3;4,4};
Cell3 = {1;1};
idx = [size(Cell3,1):size(Cell1,1)-1]+1;
Cell3{idx} = [];                                    % Add Empty Element To End Of ‘Cell3’
Result = cat(2, Cell1, Cell2, Cell3)

I do not know how robust that will be with other matrices, but it works here. It gives you a way of having the code calculate the number of empty elements to insert.

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