check availability of a file in R

I need to use a loop and each time go to folder i and check  
availability of .RData file. If it exist load it and if not submit a  
command in linux. Something like this

for (i in 1:10){
	setwd(~/i/)

# Perhaps:
	if (target %in% list.files( patt="\.Rdata") ) {

.Rdata (?????)

	#load (.RData

load( target)

	else

# perhaps you could explain your goals for this next operation?

	<run a command in linux like " cd ~/i/  ;  qsub job$i.pbs" >
}

Any idea how to do that in R?

Farhad

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

Does file.exists answer to your question?
file.exists(".RData")

If you are not sure of the exact name of the file but know it contains ".RData", you can try:
List.files(directory,".RData")


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Farhad Shokoohi
Sent: 07 September 2011 01:07
To: R-help at r-project.org
Subject: [R] check availability of a file in R

I need to use a loop and each time go to folder i and check availability of .RData file. If it exist load it and if not submit a command in linux. Something like this

for (i in 1:10){
        setwd(~/i/)
        if .Rdata (?????)
        load (.RData
        else
        <run a command in linux like " cd ~/i/  ;  qsub job$i.pbs" >
}

Any idea how to do that in R?

Farhad

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