On 21.12.2011 14:39, Keith Jewell wrote:
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?
You are just using a different order - sort accoriding to Var1...
Best,
Uwe Ligges
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?