[R] building packages for Linux vs. Windows

[John Sorkin]

On my widows XP computer, W
>From my windows XP system running R 2.6.1:
> version
               _                           
platform       i386-pc-mingw32             
arch           i386                        
os             mingw32                     
system         i386, mingw32               
status                                     
major          2                           
minor          6.1                         
year           2007                        
month          11                          
day            26                          
svn rev        43537                       
language       R                           
version.string R version 2.6.1 (2007-11-26)

John Sorkin M.D., Ph.D.
Chief, Biostatistics and Informatics
University of Maryland School of Medicine Division of Gerontology
Baltimore VA Medical Center
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>>> Ted Harding <Ted.Harding at manchester.ac.uk> 2/10/2008 1:39 PM >>>
On 10-Feb-08 18:07:56, Erin Hodgess wrote:
> Hi R People:
> 
> I sure that this is a really easy question, but here goes:
> 
> I'm trying to build a package that will run on both Linux and Windows.
> 
> However, there are several commands in a section that will be
> different in Linux than they are in Windows.
> 
> Would I be better off just to build two separate packages, please?
> If just one is needed, how could I determine which system is running
> in order to use the correct command, please?
> 
> Thanks in advance,
> Erin

There is the "version" (a list) variable:

  version
# platform       i486-pc-linux-gnu
# arch           i486
# os             linux-gnu
# system         i486, linux-gnu
# status         Patched
# major          2
# minor          4.0
# year           2006
# month          11
# day            25
# svn rev        39997
# language       R

from which you can extract the "os" component:

  version$os
# [1] "linux-gnu"

I don;t know what this says on a Windows system,
but it surely won't mention Linux!

So testing this wil enable you to set a flag, e.g.

Linux<-ifelse(length(grep("linux",version$os))>0, TRUE, FALSE)

if(Linux){window<-function(...) X11(...)} else
         {window<-function(...) windows(...)}

Hoping this helps,
Ted.

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E-Mail: (Ted Harding) <Ted.Harding at manchester.ac.uk>
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Date: 10-Feb-08                                       Time: 18:39:29
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