[R] Recursive concatenation

[Liaw, Andy]

Or something like:

R> do.call(paste, c(expand.grid(LETTERS[1:3], 1:3), sep=""))
[1] "A1" "B1" "C1" "A2" "B2" "C2" "A3" "B3" "C3"

(The ordering is bit different, but that shouldn't matter.)

Andy 

From: Dimitris Rizopoulos
> try this:
> 
> paste(rep(LETTERS[1:3], each = 3), 1:3, sep = "")
> 
> 
> Best,
> Dimitris
> 
> ----
> Dimitris Rizopoulos
> Ph.D. Student
> Biostatistical Centre
> School of Public Health
> Catholic University of Leuven
> 
> Address: Kapucijnenvoer 35, Leuven, Belgium
> Tel: +32/(0)16/336899
> Fax: +32/(0)16/337015
> Web: http://med.kuleuven.be/biostat/
>       http://www.student.kuleuven.be/~m0390867/dimitris.htm
> 
> 
> Quoting Dennis Fisher <fisher at plessthan.com>:
> 
> > Colleagues,
> >
> > I want to create the following array:
> > 	"A1", "A2", "A3", "B1", "B2", "B3", "C1", "C2", "C3"
> >
> > I recall that there is a trick using "c" or "paste" permitting me to
> > form all combinations of c("A", "B", "C") and 1:3.  But, I can't
> > recall the trick.
> >
> > Dennis
> >
> >
> > Dennis Fisher MD
> > P < (The "P Less Than" Company)
> > Phone: 1-866-PLessThan (1-866-753-7784)
> > Fax: 1-415-564-2220
> > www.PLessThan.com
> >
> >
> > 	[[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
> >
> 
> 
> 
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> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
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> and provide commented, minimal, self-contained, reproducible code.
> 
> 
> 


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