From andy_liaw@merck.com  Fri Jan  3 19:09:02 2003
From: andy_liaw@merck.com (Liaw, Andy)
Date: Fri Jan  3 19:09:02 2003
Subject: [Rd] save bug (PR#2418)
Message-ID: <51F9C42DA15CD311BD220008C707D81906FFCA12@usrymx10.merck.com>

I know that Bert has used something like the following in his S code in the
past:

myfunction <- function(..., requiredArg = stop("requiredArg not supplied",
...)

Wouldn't this work?  This would be a problem if somehow the requiredArg is
not evaluated, but then it wouldn't be a required agrument...

We are still on NT4sp6.  Scheduled to move to XP this year.

Cheers,
Andy

> From: ripley@stats.ox.ac.uk [mailto:ripley@stats.ox.ac.uk]
> Sent: Friday, January 03, 2003 12:52 PM
> To: bert_gunter@merck.com
> Cc: r-devel@stat.math.ethz.ch; R-bugs@biostat.ku.dk
> Subject: Re: [Rd] save bug (PR#2418)
> 
> 
> On Fri, 3 Jan 2003 bert_gunter@merck.com wrote:
> 
> > My apologies if these are known -- I'm new to R (moved over 
> from S-Plus).
> >
> > All on Windows NT GUI, R1.6.1 and associated packages.
> >
> > 1. save(x) gives the following error message:
> > Error in save(x) : `file' must be non-empty string
> >
> > According to the save() help file, the empty string is the default.
> 
> Indeed it is.  And the default is to generate an error.  That's
> deliberate, I understand.  The help file does say
> 
>     file: a connection or the name of the file where the data will be
>           saved.  Must be a file name for workspace format version 1.
> 
> Since "" is none of the above, it is clearly erroneous.
> 
> I am not sure what to do to improve this: do you have any suggestions?
> 
> [That dump() chooses a meaningless filename and people 
> persist in using in
> (e.g. in S library sections) seems counter-productive to me.]
> 
> 
> > 2. In the file>Display file GUI menu, if you try to display 
> a file that is
> > in use by another application -- or at least one particular 
> application I
> > use -- R crashes.
> 
> That's hard to debug. Do you get any useful feedback from a Dr.Mingw
> or other dump?  My guess is that is a problem in msvcrt.dll, 
> but I will
> see if I can trigger it.  What Windows version, BTW?
> 
> 
> > 3. I also have noticed that for ** SOME ** data sets I 
> have, the relation=
> > argument of the scales= option for xyplot (in Lattice) only 
> works for
> > relation='same' -- both 'free' and 'sliced' give error messages.
> > Unfortunately, it's not handy for me to go reproduce the 
> error at the
> > moment, so I can't give the specifics. I'll send more 
> details in future
> > unless told that this is already known about.
> 
> Lattice has been updated a couple of times recently.  If this persists
> once R 1.6.2 is out (due in a week's time) we would want to see the
> details.
> 
> -- 
> Brian D. Ripley,                  ripley@stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
> 
> ______________________________________________
> R-devel@stat.math.ethz.ch mailing list
> http://www.stat.math.ethz.ch/mailman/listinfo/r-devel
> 

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[Rd] save bug (PR#2418)
Liaw, Andy