Combinations with a condition
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I have 4 vectors as shown below. I want to create a matrix that list all the possible combinations with the condition that
x = [0 1 2 3 4 5 6]
x1 = [0 3 6]
x2 = [0 3 6]
x3 = [0 3 6]
采纳的回答
Easy enough.
x = 0:6;
[x1,x2,x3] = ndgrid([0 3 6]);
x123 = [x1(:),x2(:),x3(:)];
ind = ismember(sum(x123,2),3*x);
x123(ind,:)
You want to be careful that you work in INTEGER arithmetic though. This is why I multiplied x by 3, instead of dividing the sum by 3.
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