R help - Sep 2011 - 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

On Sep 6, 2011, at 8:07 PM, Farhad Shokoohi wrote:
> 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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__________ Information from ESET NOD32 Antivirus, version of virus signature
database 6275 (20110707) __________

The message was checked by ESET NOD32 Antivirus.

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