create cell array by extracting all the same row from multiple matrix

Question

Katherine Zheng 2022-9-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1813410-create-cell-array-by-extracting-all-the-same-row-from-multiple-matrix

评论： Stephen23 2022-10-1

I have three double A = [105x3]; B = [105x3]; C = [105x3]; I want to create a cell array D = {105 cells} each cells contains the corresponding rows from A B C.

For example,

D {1} = [

A(1,:);

B(1,:);

C(1,:);]

each row from A B C are in different rows in D

Is this achievable through cellfun?

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Answer 1

Stephen23 2022-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/1813410-create-cell-array-by-extracting-all-the-same-row-from-multiple-matrix#answer_1062110

在 MATLAB Online 中打开

"Is this achievable through cellfun?"

Yes:

A = rand(105,3);
B = rand(105,3);
C = rand(105,3);
D = cellfun(@vertcat,num2cell(A,2),num2cell(B,2),num2cell(C,2), 'uni',0)
D = 105×1 cell array
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}
    {3×3 double}

But most likely you should be using ND arrays rather than concatenating & splitting data like that.

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Katherine Zheng 2022-9-28

Hi @Stephen23 thank you very much. That's exactally what I want. But I am not sure I understand the 'using ND arrays' in your suggestion. Could you possibly explain a bit? Many thanks.

Stephen23 2022-10-1

"But I am not sure I understand the 'using ND arrays' in your suggestion."

https://www.mathworks.com/help/matlab/math/multidimensional-arrays.html

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Answer 2

KSSV 2022-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/1813410-create-cell-array-by-extracting-all-the-same-row-from-multiple-matrix#answer_1062105

编辑：KSSV 2022-9-28

在 MATLAB Online 中打开

D = cell(105,5) ;
for i = 1:105
    D{i} = [A(i,:) B(i,:) C(i,:)] ;
end

Or

D = [A B C] ;
D = num2cell(D,2) ;

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Katherine Zheng 2022-9-28

Hi @KSSV, is it possible to achieve through cellfun?

KSSV 2022-9-28

cellfun uses loop inside.....

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create cell array by extracting all the same row from multiple matrix

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