[R] is auto-save possible?
Prof Brian Ripley
ripley at stats.ox.ac.uk
Tue Nov 13 09:13:05 CET 2001
On Mon, 12 Nov 2001, Liaw, Andy wrote:
> Dear R-help,
> This is just a wishlist item: Is it possible at all to make R (optionally)
> automagically do save.image() periodically (e.g., every fixed number of
> commands or >= fixed amount of time)?
It's not possible currently, but it has been mentioned as a possibility.
Ideally one would do it by time, but that needs a concurrent operation.
It would be safest to save only at the top-level prompt (and make more
sense given that the objects are most likely to be complete), but then
there would be no saves during loops.
> The reason I asked is that I frequently run R-1.3.1 inside XEmacs 21.4.5/ESS
> 5.1.19 under WinNT, and had seen Rterm.exe crashed a few times for no
> apparent reason (and not reproducible). When that happens, I lost all the
> objects created in that R session and had to re-run the script (which could
> be time consuming). At one time R crashed right in the middle of quitting,
> which corrupted the .Rdata file. Luckily I had a backup that was fairly
> recent that I didn't loose everything. (Admittedly, auto-save wouldn't help
> this last problem though.)
That's also on the agenda. Most word-processors do something like save
the file to another name, then rename the files in a non-interruptible
operation. The problem there is that one needs double the diskspace,
temporarily, so we would need a means to switch this one or off.
Several things are going on re saves. There is a new, more compact,
format for 1.4.0, we are planning to allow compression, saving over
For now, I would arrange to call save.image() (or save on the critical
files) at strategic points in the calculation).
As someone said recently on S-news, it is sometimes (often?) Windows that
crashes, not R (or S-PLUS).
Brian D. Ripley, ripley at 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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html
Send "info", "help", or "[un]subscribe"
(in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch
More information about the R-help