R help - Aug 2004 - How generate "A01", "A02", ..., "A99"?

Hi,
 
Anyone can tell me how to generate "A01", "A02", ...,
"A99"?
 
paste("A", 1:99, sep="") generates "A1",
"A2",..., "A99". This is not  what I want.
 
Thanks for the help.
 
-MY

	[[alternative HTML version deleted]]

"Yao, Minghua" <myao at ou.edu> writes:
> Hi,
>  
> Anyone can tell me how to generate "A01", "A02", ...,
"A99"?
>  
> paste("A", 1:99, sep="") generates "A1",
"A2",..., "A99". This is not  what I want.
c(paste("A0",1:9,sep=""),paste("A",10:99,sep=""))

?

-- 
Anthony Rossini			    Research Associate Professor
rossini at u.washington.edu            http://www.analytics.washington.edu/ 
Biomedical and Health Informatics   University of Washington
Biostatistics, SCHARP/HVTN          Fred Hutchinson Cancer Research Center
UW (Tu/Th/F): 206-616-7630 FAX=206-543-3461 | Voicemail is unreliable
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Yao, Minghua wrote:
> Hi,
>  
> Anyone can tell me how to generate "A01", "A02", ...,
"A99"?
>  
> paste("A", 1:99, sep="") generates "A1",
"A2",..., "A99". This is not  what I want.
>  
> Thanks for the help.
>  
> -MY
> 
> 	[[alternative HTML version deleted]]
> 
How about?

sapply(1:99, function(i) sprintf("A%02d", i))

--sundar

And yet another way:

x <- as.character(101:199)
substr(x,1,1) <- "A"

> -----Original Message-----
> From: r-help-bounces at stat.math.ethz.ch 
> [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Marc Schwartz
> Sent: Friday, August 20, 2004 4:38 PM
> To: Peter Dalgaard
> Cc: R Help; sundar.dorai-raj at pdf.com
> Subject: Re: [R] How generate "A01", "A02", ...,
"A99"?
> 
> 
> On Fri, 2004-08-20 at 15:15, Peter Dalgaard wrote:
> > Sundar Dorai-Raj <sundar.dorai-raj at pdf.com> writes:
> > 
> > > Yao, Minghua wrote:
> > > 
> > > > Hi,
> > > >  Anyone can tell me how to generate "A01",
"A02", ..., "A99"?
> > > >  paste("A", 1:99, sep="") generates
"A1", "A2",...,
> "A99". This is
> > > > not  what I want.
> > > >  Thanks for the help.
> > > >  -MY
> > > > 	[[alternative HTML version deleted]]
> > > >
> > > 
> > > How about?
> > > 
> > > sapply(1:99, function(i) sprintf("A%02d", i))
> > 
> > or just 
> > 
> > sapply(1:99,sprintf,fmt="A%02d")
> 
> 
> or yet another variation:
> 
> paste("A", formatC(1:99, width = 2, format = "d", flag
= "0"),
>       sep = "")
> 
> 
> HTH,
> 
> Marc Schwartz
> 
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