[R] Pairwise combination
chen_1002 at fisher.osu.edu
Tue May 11 23:15:36 CEST 2010
combn function works pretty well for me.
On Tue, May 11, 2010 at 5:12 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
> combn(1:4, 2, paste, collapse = ' and ')
> On Tue, May 11, 2010 at 5:54 PM, Ista Zahn <istazahn at gmail.com> wrote:
>> On Tuesday 11 May 2010 4:27:01 pm David Winsemius wrote:
>> > On May 11, 2010, at 1:45 PM, chen jia wrote:
>> > > Hi there,
>> > >
>> > > I am looking for a function that takes a vector as input and generates
>> > > all pair wise combination of the elements of the input vector.
>> > ?combn
>> > > For example, the input vector is c(1,2,3,4). The output vector is c(1
>> > > and 2, 1 and 3, 1 and 4, 2 and 3, 2 and 4, 3 and 4).
>> > That's not a vector.
>> True, although it is possible the OP wanted paste(combn(1:4, 2)[1,],
>> combn(1:4, 2)[2,])
>> > > The
>> > > representation here is generic.
>> > >
>> > > I can use a for loop to do it, but it gets slow when the number of
>> > > elements of the input vector is large.
>> > >
>> > > Best,
>> > > Jia
>> > David Winsemius, MD
>> > West Hartford, CT
>> > ______________________________________________
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>> > minimal, self-contained, reproducible code.
>> R-help at r-project.org mailing list
>> PLEASE do read the posting guide
>> and provide commented, minimal, self-contained, reproducible code.
> Henrique Dallazuanna
> 25° 25' 40" S 49° 16' 22" O
Ohio State University - Finance
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