[R] Looping and Pasting

[Greg Snow]

Try:

for( i in 255 ){ 
	plot( get( paste('m.', i, sep='') )$medoids )
}

For future use it may be easier to put m1, m2, ... Into a list and work
with that:

 med.list <- list()
 for( i in 1:255 ){
	med.list[[i]] <- get( paste('m.',i,sep='') )
 }

 lapply( med.list, function(x) plot(x$medoid) )

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Mark Orr
> Sent: Friday, February 22, 2008 1:07 PM
> To: r-help at r-project.org
> Subject: [R] Looping and Pasting
> 
> Hello R-community:  Much of the time I want to use loops to 
> look at graphs, etc.  For example,
> 
> I have 25 plots, for which the names are m.1$medoids, 
> m.2$medoids, ..., m.25$medoids.
> I want to index the object number (1:25) as below (just to 
> show concept).
> 
> for (i in 1:25){
> plot(m.i$medoids)
> }
> 
> I've tried the following, with negative results
> 
> for ...
> plot(paste("m.",i,"$medoids",sep=""))
> 
> for ..
> plot(get(paste("m.",i,"$medoids",sep="")))
> 
> for...
> plot(eval(paste("m.",i,"$medoids",sep="")))
> 
> 
> I'm not very fluent with R, but would like to have the 
> general capacity to run loops in this fashion.  help and 
> archives did not help me, although I'm sure I've either 
> missed something or did not properly understand the internals of R.
> 
> Any help or alternatives are much welcome; however, note, 
> that alternatives should be general, because I desire this 
> functionality for other tasks.
> 
> Thanks in advance,
> 
> Mark Orr
> 
> 	[[alternative HTML version deleted]]
> 
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