[R] How to source files from a search path?

Don MacQueen macq at llnl.gov
Sat Feb 13 01:11:07 CET 2010

Well, you still will need Sys.getenv() to get the value of the 
environment variable into R.

Are you familiar with the function named list.files() ?

This may do the job:

    source( list.files( Sys.getenv('SOMEENVVAR'), pattern='myfilename') )

But I haven't tested it.


(and your name or affiliation would still be appreciated, as a matter 
of R-help etiquette)

At 5:42 PM -0600 2/12/10, blue sky wrote:
>On Fri, Feb 12, 2010 at 5:28 PM, Bert Gunter <gunter.berton at gene.com> wrote:
>>  1. Etiquette on this list is to sign posts with your real name.
>>  2. Please use R's Help facilities (beyond RSiteSearch()) first before
>>  posting:
>>  ?help.search
>>  help.search("environment variable")
>I guess you are referring to 'Sys.getenv', which is not what I am looking for.
>To restate my question:
>How to source a file without specifying the full path, but by deriving
>the file's full path by searching in an environment variable.
>Of course, 'Sys.getenv' will be useful if I want to make such a
>function myself. But my question was to look for a better version of
>Are you clear about my question now?
>>  -----Original Message-----
>>  From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
>>  Behalf Of blue sky
>>  Sent: Friday, February 12, 2010 2:55 PM
>>  To: r-help at stat.math.ethz.ch
>>  Subject: [R] How to source files from a search path?
>>  Suppose some environment variable (say MY_R_INC) has a number of
>>  paths. I want to source some file relative to some path in $MY_R_INC
>>  (just as #include in C++ does, which looks for header file in a number
>>  of directories). I RSiteSearch'ed, but I don't find any function that
>>  satisfies my need. Could somebody let me know if I overlooked
>>  something?
>>  ______________________________________________
>>  R-help at r-project.org mailing list
>>  https://*stat.ethz.ch/mailman/listinfo/r-help
>>  PLEASE do read the posting guide 
>>  and provide commented, minimal, self-contained, reproducible code.
>R-help at r-project.org mailing list
>PLEASE do read the posting guide http://*www.*R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA

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