[R] Exporting PDF

[Phil Spector]

Since R provides the file.exists() function for exactly this
purpose, I would recommend avoiding using shell scripts for 
such a simple task.  file.exists() is a multiplatform solution
to the problem.
 					- Phil Spector
 					 Statistical Computing Facility
 					 Department of Statistics
 					 UC Berkeley
 					 spector at stat.berkeley.edu


On Tue, 20 Apr 2010, Polwart Calum (County Durham and Darlington NHS Foundation Trust) wrote:

>> I run the script and it exports a PDF called "version 1".
>> I want it to check if "version 1" already exists. If so,
>>  then I want the new graphs to be exported as
>> "version 2", and so on.
>>
>> Is it possible to do it in R?
>
> Someone may know a way.  However its certainly possible to execute a command in linus from R.  So you can ls the file (in windows try dir) and see if it exists, and build a loop round that.
> Just bew3are it'll be quick if there is only 1 file.  If you have 9999 files it may slow things down a bit!
> Here's my example...
>
> #Example script to check if a file exists (linux system)
> filename = "somefile"
> fileno = 0
> extension= ".pdf"
> path="/home/user/"
>
> repeat
> {
>        fullfile= paste(path,filename,fileno,extension, sep="")
>        if (length (system(paste("ls",fullfile), intern = T)) == 0) break
>        fileno<-fileno+1
> }
>
> #your command to save the file... using 'fullfile' as the filename and path
>
>
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