[R] Problem calling R from within perl script on Windows

[Barry Hall]

I need to call R from within a Perl script.  I do so using a system call like
this:
@args = ('R --vanilla --quiet --file=Rblock'); 
system(@args) == 0 or die "system @args failed: $!";

The script works perfectly when run in Mac OSX or Linux.  In Windows XP it
fails with the message " 'R' is not recognized as an internal or external
command, operable program or batch file".

To ensure that R was properly installed and that the environment variable
"path" was correctly set, I executed the same command (R --vanilla --quiet
--file=Rblock) from the command line and it worked perfectly; i.e. R ran
with the expected behavior.

Similar system calls to other external programs, e.g.
@args = ('Notepad'); 
system(@args) == 0 or die "system @args failed: $!";
work perfectly.

Is there any obvious reason that this particular call works from the command
line but not from within a perl script?

Thanks for any assistance
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