Thanks a lot for your replies.
Richard has the correct interpretation. I was trying to avoid using a
function involving "paste", since that's kind of inelegant.
So it looks like, for example, there's no internal commands that lets me
set input directory/ies (e.g. "C:/Projects/Data1"), and then set a
separate output directory/ies (e.g. "C:/Projects/Out"), in any order
and/or frequency (since S_PROJ can only be set only once/session). Do
I understand correctly?
- Iyue
> -----Original Message-----
> From: Tony Plate [mailto:tplate@blackmesacapital.com]
> Sent: Friday, September 24, 2004 10:16 AM
> To: Richard M. Heiberger; Iyue Sung; s-news@lists.biostat.wustl.edu
> Subject: Re: [S] setwd() analogue
>
> The command line variable setting S_PROJ=<dir> actually sets the path
> relative to which file I/O is performed (the original poster's
apparent
> question) as well as the location where .Data directory is looked for
(and
> also the .Prefs location). These are independent settings in
> S-PLUS. These settings can also be controlled independently via the
> command line variables S_CWD, S_DATA, and S_PREFS. See the
"Programmer's
> Guide" for details on all the command line switches: "Chapter 18: The
> S-PLUS Command Line and the System Interface".
>
> Note however that these are completely independent settings --
changing
> the
> database attached in position 1 has absolutely no effect on the
location
> where file(), read.table(), etc. look for files.
>
> -- Tony Plate
>
> At Thursday 09:25 PM 9/23/2004, Richard M. Heiberger wrote:
> >There are two distinct interpretations of your question.
> >Let me try both.
> >
> >
> >1. Change the .Data that is first on your search() list.
> >The .Data directory must already exist and you must have write
> permission.
> >
> >attach("c:/HOME/tmp/.Data", pos=1)
> >
> >Now all S-Plus objects that you create by assignment
> > a <- 2:5
> >will be written in c:/HOME/tmp/.Data
> >
> >
> >
> >2. Change the location where files other than S-Plus objects are
> >read and written. In my usual setup, I start S-Plus from
> >the c:/HOME/rmh directory and c:/HOME/rmh/.Data is in the first
> >position of my search() list. A statement of the form
> > myData <- read.table("myData.csv")
> >will find the file c:/HOME/rmh/myData.csv
> >
> >I wish to read some data from another location, say from c:/datasets/
> >
> >Define a function
> > datasets <- function(filename) paste("c:/datasets", filename,
> sep="/")
> >
> >Then access the file with
> > myData <- read.table(datasets("myData.csv"))
> >This will read the file c:/datasets/myData.csv
> >
> >The advantage of a function is that it can be changed external to the
> >read.table statement. Indeed, it can define a different directory on
> >every computer you use and still work without changing any code.
> >
> >
> >
> >My impression of your original question is that you were trying to
> >solve the second interpretation by a method appropriate to the first
> >interpretation.
> >
> >Hui-May_Chu@vrtx.com gave a method similar to the second
interpretation.
> >
> >Tony Plate <tplate@blackmesacapital.com> was suggesting a startup
> >method equivalent to the first interpretation.
> >
> >Rich
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