Create Matrix from Multiple Matrices

Question

Rounak Saha Niloy 2022-3-15

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1671834-create-matrix-from-multiple-matrices

回答： Rounak Saha Niloy 2022-3-15

I have 3 matrices as follows-

A = [1 2 3]
A = 1×3
     1     2     3
B = [4 5 6]
B = 1×3
     4     5     6
C = [7 8 9]
C = 1×3
     7     8     9

I want to create a matrix D as follows-

[1 4 7; 1 4 8; 1 4 9; 1 5 7; 1 5 8; 1 5 9; 1 6 7; 1 6 8; 1 6 9; 2 4 7; 2 4 8; 2 4 9; 2 5 7; 2 5 8; 2 5 9; 2 6 7; 2 6 8; 2 6 9; 3 4 7; 3 4 8; 3 4 9; 3 5 7; 3 5 8; 3 5 9; 3 6 7; 3 6 8; 3 6 9]
ans = 27×3
   4     7
   4     8
   4     9
   5     7
   5     8
   5     9
   6     7
   6     8
   6     9
   4     7

How do I do this?

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Answer 1

Rounak Saha Niloy 2022-3-15

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1671834-create-matrix-from-multiple-matrices#answer_917819

I have got a better option since my matrix size is large and no. of matrices is also large.

If my matrices are- A, B,C and so on...

D= combvec(A,B,C, ...)

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Answer 2

Walter Roberson 2022-3-15

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1671834-create-matrix-from-multiple-matrices#answer_917814

在 MATLAB Online 中打开

A = [1 2 3];
B = [4 5 6];
C = [7 8 9];
[Ag, Bg, Cg] = ndgrid(C, B, A);
D = fliplr([Ag(:), Bg(:), Cg(:)])
D = 27×3
     1     4     7
     1     4     8
     1     4     9
     1     5     7
     1     5     8
     1     5     9
     1     6     7
     1     6     8
     1     6     9
     2     4     7

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Answer 3

Kevin Holly 2022-3-15

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1671834-create-matrix-from-multiple-matrices#answer_917804

在 MATLAB Online 中打开

A = [1 2 3];
B = [4 5 6];
C = [7 8 9];
D = [];
    
for i = A
    for ii = B
        for iii = C
            D = [D;i ii iii];
        end
    end
end
D
D = 27×3
     1     4     7
     1     4     8
     1     4     9
     1     5     7
     1     5     8
     1     5     9
     1     6     7
     1     6     8
     1     6     9
     2     4     7