I have the following result of expand grid:
> d <- expand.grid(c("x","y","z"),c("x","y","z"))
What I want is to create a combination of strings
but only the half of the all combinations:
Var1 Var2
1 x x
2 y x
3 y y
4 z y
5 x z
6 z z
What's the way to do it?
G.V.
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