Message-ID: <d8ad40b50812051101j181d4e98q6dacab8c364833c8@mail.gmail.com>
Date: 2008-12-05T19:01:57Z
From: Barry Rowlingson
Subject: Running R Script on a Sequence of Files
In-Reply-To: <F5526FCD-E99C-44F0-9124-9CD1E9008D5E@sas.upenn.edu>
2008/12/5 Chris Poliquin <poliquin at sas.upenn.edu>:
> Hi,
>
> I have about 900 files that I need to run the same R script on. I looked
> over the R Data Import/Export Manual and couldn't come up with a way to
> read in a sequence of files.
>
> The files all have unique names and are in the same directory. What I want
> to do is:
> 1) Create a list of the file names in the directory (this is really what I
> need help with)
> 2) For each item in the list...
> a) open the file with read.table
> b) perform some analysis
> c) append some results to an array or save them to another file
> 3) Next File
>
> My initial instinct is to use Python to rename all the files with numbers
> 1:900 and then read them all, but the file names contain some information
> that I would like to keep intact and having to keep a separate database of
> original names and numbers seems inefficient. Is there a way to have R read
> all the files in a directory one at a time?
I can't believe the two 'solutions' already posted. It's easy:
?list.files
Barry