[R] Exporting PDF

[chrisli1223]

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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