Take cartesian product between lists of tuples and a vector

Question

mrule 2015-1-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/173581-take-cartesian-product-between-lists-of-tuples-and-a-vector

评论： Mike Croucher 2023-4-4

I know matlab doesn't have tuples or vectors, but what I mean is say I have

A = [ 0 1 ; 2 3 ]
B = [ 4 5 ; 6 7 ]
C = [ 0 1 ]

I'd like to take the cartesian product of these items, like the "product" function from itertools in python.

product(A,B,C) = 
[ 0 1 4 5 0; 
1 4 5 1; 
1 6 7 0; 
1 6 7 1; 
3 4 5 0; 
3 4 5 1; 
3 6 7 0; 
3 6 7 1]

Is there a function in matlab that does this, accepting an arbitrary number of arguments? All the examples say "use meshgrid" which doesn't work in this case since that only takes the product of 2 or 3 vectors.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Mike Croucher 2023-4-4

Use the combinations function. New in R2023a The new combinations function in MATLAB – for cartesian products and parameter sweeps » The MATLAB Blog - MATLAB & Simulink (mathworks.com)

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt J 2015-1-30

5
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/173581-take-cartesian-product-between-lists-of-tuples-and-a-vector#answer_166472

编辑：Matt J 2015-1-30

在 MATLAB Online 中打开

Use ndgrid.

      ma=size(A,1);
      mb=size(B,1);
      mc=size(C,1);
      [a,b,c]=ndgrid(1:ma,1:mb,1:mc);
       product = [A(a,:),B(b,:),C(c,:)]
                    product =
                         0     1     4     5     0
                         2     3     4     5     0
                         0     1     6     7     0
                         2     3     6     7     0
                         0     1     4     5     1
                         2     3     4     5     1
                         0     1     6     7     1
                         2     3     6     7     1