From andy_liaw at merck.com  Thu Mar 30 21:32:16 2006
From: andy_liaw at merck.com (Liaw, Andy)
Date: Thu, 30 Mar 2006 14:32:16 -0500
Subject: [Rd] compress defaults for save() and save.image()
Message-ID: <39B6DDB9048D0F4DAD42CB26AAFF0AFAFED9F1@usctmx1106.merck.com>

Ditto for me, with the following exceptions:

- I always use save(..., compress=TRUE), without exception.
- The only time I'd use save.image() is when I need to break a remote
connection on short notice.
- I have not used options() to set the default simply because I have not
figured out how exactly to do it.  From what I remember, the doc simply says
it can be done, but does not explicitly say how.

Andy

From: Roger D. Peng
> 
> Prof Brian Ripley wrote:
> > I have changed the default in save() to compress = !ascii.  
> This seems
> > quite safe, as almost always save() is called explicitly 
> and people will
> > appreciate that it might take a little time to save large 
> objects (and 
> > depending on your system, compression could even be faster).
> 
> I'm in favor of such a change.  I almost always explicitly 
> set `compress = 
> TRUE'.  When I don't use it, it's because I want to be able 
> to load large 
> objects quickly and I've noticed that loading uncompressed 
> workspaces can be 
> quite a bit faster.  Usually though, the savings in disk 
> space is worth the 
> small penalty in loading time.
> 
> > 
> > Should we also change the default in save.image()?  That is almost 
> > always
> > used implicitly, via q(), a menu ....  There are arguments 
> that it is a 
> > more serious change so should not be done at the end of the 
> release cycle, 
> > and also that large .RData files are something people would 
> want to avoid.
> 
> I rarely use `save.image()' except to occasionally dump data 
> during a long run 
> for crash recovery purposes.  I don't think changing the 
> defaults would make a 
> difference to me.
> 
> > 
> > BTW, the defaults can be changed via options() (see ?save): 
> has anyone
> > ever found that useful?
> 
> I was not even aware of this!
> 
> > 
> > And whilst I am feeling curious, has anyone used save(ascii 
> = TRUE) in
> > recent years?
> > 
> 
> I don't think I've ever used this feature.
> 
> -roger
> 
> -- 
> Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/
> 
> ______________________________________________
> R-devel at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-devel
> 
>



[Rd] compress defaults for save() and save.image()
Liaw, Andy