[R] clear R-objects inside a function?

[Rashid Nassar]

In case this is not what you intended, may I point out that
rm(list=ls(pat="g*")) will remove _all_ objects and its effect appears to be
the same as rm(list=ls()) as far as I can tell.  To remove objects whose
names have "g" anywhere in the string, use rm(list=ls(pat="g")), or names
starting with "g" one can use rm(list=ls(pat="^g")). 

The "^" and "$" can be used to delimit the beginning and ending of a 
string, respectively.

Rashid Nassar


On Tue, 10 Apr 2001, Paul E Johnson wrote:

> Date: Tue, 10 Apr 2001 09:08:18 -0500
> From: Paul E Johnson <pauljohn at ukans.edu>
> To: "r-help at stat.math.ethz.ch" <r-help at stat.math.ethz.ch>
> Subject: [R] clear R-objects inside a function?
> 
> Using RedHat Linux 7.0, R-1.2.2, R-hdf5-1.2 library, 
> 
> I want to load a dataset, do some stuff with it, then erase its objects,
> get an other, repeat.  My friend wrote a function which tried to clear
> away all the objects. At the end, it uses rm() to remove objects. This
> is the same way we do it interactively, from the R prompt:
> 
> testLoadSeveralHDF <- function(numFiles) {
>   for (i in 0:(numFiles-1)) {
>     filename <- paste("trial",i,".hdf",sep="")
>     print(filename)
>     hdf5load(filename)
>     rm(list = ls(pat="g*"))   
>   }
> }
> 
> However, after that program runs, the g* objects are not erased, but
> typing "rm(list=ls(pat="g*")) from the command line does erase them.  I
> realized there's something about the environment that I need to tell the
> function, I just don't know what?
> 
> pj
> 
> ps. Now that Frank Harrell is using R, I'm so enthusiastic! I'll do some
> R in my advanced methods class in Fall, 2001 and continue my updating of
> the tipsheet: http://lark.cc.ukans.edu/~pauljohn/R/statsRus.html
> 
> -- 
> Paul E. Johnson                       email: pauljohn at ukans.edu
> Dept. of Political Science            http://lark.cc.ukans.edu/~pauljohn
> University of Kansas                  Office: (785) 864-9086
> Lawrence, Kansas 66045                FAX: (785) 864-5700
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