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[Martin Maechler]

>>>>> "Uwe" == Uwe Ligges <ligges at statistik.uni-dortmund.de> writes:

    Uwe> Douglas Bates wrote:
    >>  Paul E Johnson <pauljohn at ukans.edu> writes:
    >> 
    >> > 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?
    >> 
    >> Add envir = .GlobalEnv to both the ls and the rm calls.  That is
    >> 
    >> rm(list = ls(pat = "g*", envir = .GlobalEnv), envir = .GlobalEnv)

    Uwe> This will remove not only those object, beginning with g*, I
    Uwe> think.  Using pat="g" will be better, if you don't want to remove
    Uwe> all (except the ".*" ones) of your objects.

Really, it's
		pat = "^g"

pat = "g" still kills everything that has a "g".
Note these are `REGULAR expressions' not wildcards !

 ?grep  and  ?apropos

give you some examples on regexps.
But really, we need a more detailed page of R documentation (*.Rd syntax) 
about it.  Any volunteers, please?
Has src/main/regex.c has 
>>  (Implements POSIX draft P1003.2/D11.2, except for some of the
>>   internationalization features.)
>>  Copyright (C) 1993, 94, 95, 96, 97, 98, 99 Free Software Foundation, Inc.

Martin

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