unique combinations
OK, someone point it out to me; my wife tells me I can't see what's in front of me :-} I read ?expand.grid carefully, went to ?combn and ?choose but still couldn't see an easy way to get what the OP asked for. The neatest I can get (which isn't very neat!) is:
myVec <- c(1,2,3) eg <- expand.grid(myVec, myVec) eg[eg[,1] <= eg[,2],]
Var1 Var2 1 1 1 4 1 2 5 2 2 7 1 3 8 2 3 9 3 3 What am I missing? Best regards, KJ "Jeff Newmiller" <jdnewmil at dcn.davis.ca.us> wrote in message news:80cc9ff9-d867-4dfc-b6e3-9c1df782209a at email.android.com...
You could read the help for expand.grid very carefully for the answer to
this question.
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Antje Niederlein <niederlein-rstat at yahoo.de> wrote:
Hi there, I have a vector and would like to create a data frame, which contains all unique combination of two elements, regardless of order. myVec <- c(1,2,3) what expand.grid does: 1,1 1,2 1,3 2,1 2,2 2,3 3,1 3,2 3,3 what I would like to have 1,1 1,2 1,3 2,2 2,3 3,3 Can anybody help?
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