R help - Apr 2010 - Exporting PDF

Hi everyone,

I have written a script which exports my graphs as a PDF file using the
function pdf().

For instance, I run the script and it exports a PDF called "version
1".
Then, I have got a new dataset and want to run the script again. What it
usually does is overwriting "version 1". But 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?

Thanks in advance,
Chris
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a little searching would have found:

?file.exists

On Sun, Apr 18, 2010 at 7:54 PM, chrisli1223
<chrisli@austwaterenv.com.au>wrote:
>
> Hi everyone,
>
> I have written a script which exports my graphs as a PDF file using the
> function pdf().
>
> For instance, I run the script and it exports a PDF called "version
1".
> Then, I have got a new dataset and want to run the script again. What it
> usually does is overwriting "version 1". But 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?
>
> Thanks in advance,
> Chris
> --
> View this message in context:
> http://n4.nabble.com/Exporting-PDF-tp2015263p2015263.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
>
http://www.R-project.org/posting-guide.html<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?

	[[alternative HTML version deleted]]

Problem solved. I combined file.exists and while loop to create version
number. Thank you very much for your help.
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> 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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