Re: [R] using index of a loop as a macro variable

From: Charles Annis, P.E. <Charles.Annis_at_statisticalengineering.com>
Date: Tue 05 Jul 2005 - 06:39:13 EST


x <- rep(NA, 3)
for (i in 1:length(x)){
x[i] <- ...
}

will do the job, but you may be able to take advantage of R's vectorization and do what you want with no loop at all.

Charles Annis, P.E.

Charles.Annis@StatisticalEngineering.com phone: 561-352-9699
eFax: 614-455-3265
http://www.StatisticalEngineering.com  

-----Original Message-----
From: r-help-bounces@stat.math.ethz.ch
[mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of E. Michael Foster Sent: Monday, July 04, 2005 4:32 PM
To: r-help@stat.math.ethz.ch
Subject: [R] using index of a loop as a macro variable

Hi,

I'm a long-time STATA user and a R newbie. I'm doing ok, but I'm addicted to STATA macro variables. Is there something like a macro variable in R?

Specifically, I'd like to be able to do something like

for (i in 1:3) {

	.....
	x`i' <- ...

}

where R would resolve x`i' to the objects named x1, x2 and x3 as I move through the loop. I guess I could create these in advance of the loop and fill them in, but I'd rather not.

Is there a way to use an index of a loop in this manner?

thanks,
michael

E. Michael Foster
Professor of Maternal and Child Health
School of Public Health
University of North Carolina



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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Tue Jul 05 06:44:44 2005

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