Generate all possible combinations from 2 vectors

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gsourop
gsourop 2021-5-28
评论： John D'Errico 2021-5-28
Hi all,
I would like to generate a new matrix that will contain all possible combinations from 2 other matrices. For example,
A = randn(100,3);
B = randn(100,3);
The desired output should be a cell array. such as
C{1} = [A(:,1) B(:,1)];
C{2} = [A(:,1) B(:,1:2)];
C{3} = [A(:,1) B(:,1:3)];
C{4} = [A(:,1:2) B(:,1)];
C{5} = [A(:,1:2) B(:,1:2)];
C{6} = [A(:,1:2) B(:,1:3)];
C{7} = [A(:,1:3) B(:,1)];
C{8} = [A(:,1:3) B(:,1:2)];
C{9} = [A(:,1:3) B(:,1:3)];
Is there a more optimal way to generate this cell array?
Thank you in advance.
  2 个评论
gsourop
gsourop 2021-5-28
编辑：gsourop 2021-5-28
I guess something like this could do the trick, but is this the most efficient way?
A = randn(10,3);
B = randn(10,3);
v2slength = size(A,2)*size(B,2);
for i = 1:3
for j = 1:3
for k = 1:v2slength
Vec2BeStored{k} = [A(:,1:i) B(:,1:j)];
end
end
end
John D'Errico
John D'Errico 2021-5-28
Does it work, doing what you want? Is the time required to do this a problem?
Don't waste your own time looking for a slightly better solution to a non-problem. That is a classic mistake made by people.

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