[R] Running R Script on a Sequence of Files

[Jagat.K.Sheth at wellsfargo.com]

"This is almost a macro problem. It could be done in SAS language using
the WPS product (660 USD) I think. ..." 

OUCH! Why do it the complicated way??? Check out ?dir, ?list.files, and
then ?lapply for a simple start.

Don't give up so soon! When it comes to R there is no need to punt - you
can always keep possession of the ball ... :-)

Cheers,
Jagat

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Ajay ohri
Sent: Friday, December 05, 2008 12:59 PM
To: Chris Poliquin
Cc: r-help at r-project.org
Subject: Re: [R] Running R Script on a Sequence of Files

This is almost a macro problem. It could be done in SAS language using
the
WPS product (660 USD) I think.
It is a familiar problem and I would be quite interested in the result.

Is there any concept of Macros in R or a package to do the same.

Regards,

Ajay

On Fri, Dec 5, 2008 at 11:31 PM, Chris Poliquin
<poliquin at sas.upenn.edu>wrote:

> 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?
>
> - Chris
>
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