How to create all pairs

Hi,

I have:
i = c(1,2,3)
j = c(4,5,6)

How do I create a matrix of all pairs?
i.e.
1,4
1,5
1,6
2,4
:

Thanks!
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?expand.grid

e.g.

M <- expand.grid(i = 1:3, j = 4:6)

You can coerce it to a matrix if that is really what you want. 

Bill Venables
http://www.cmis.csiro.au/bill.venables/ 

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of alad
Sent: Tuesday, 26 May 2009 9:27 AM
To: r-help at r-project.org
Subject: [R] How to create all pairs

Hi,

I have:
i = c(1,2,3)
j = c(4,5,6)

How do I create a matrix of all pairs?
i.e.
1,4
1,5
1,6
2,4
:

Thanks!
View this message in context: http://www.nabble.com/How-to-create-all-pairs-tp23714659p23714659.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
expand.grid(i,j)
Hi,

I have:
i = c(1,2,3)
j = c(4,5,6)

How do I create a matrix of all pairs?
i.e.
1,4
1,5
1,6
2,4
:

Thanks!

--
View this message in context: http://www.nabble.com/How-to-create-all-pairs-tp23714659p23714659.html
Sent from the R help mailing list archive at Nabble.com.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Mike Lawrence
Graduate Student
Department of Psychology
Dalhousie University

Looking to arrange a meeting? Check my public calendar:
http://tr.im/mikes_public_calendar

~ Certainty is folly... I think. ~
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