[R] is auto-save possible?

[Luke Tierney]

On Tue, Nov 13, 2001 at 09:49:52AM +0100, Peter Dalgaard BSA wrote:
> Prof Brian Ripley <ripley at stats.ox.ac.uk> writes:
> 
> > 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.
> 
> In principle, tkcmd("after",...) from the tcltk package can schedule
> timed events, but I'm a little unsure what happens if you put
> save.image() inside of it... It might be worth a try, but don't do it
> on valuable data! This should save once per minute (although not
> during computations):

On Windows I think you get it during computations too, for better or
worse, given the way event handling works there.

> 
> library(tcltk)
> f <- function() {save.image() ; tkcmd("after", 60e3, f)}
> f()
> 
> (One way of stopping it is to remove f)

-- 
Luke Tierney
University of Minnesota                      Phone:           612-625-7843
School of Statistics                         Fax:             612-624-8868
313 Ford Hall, 224 Church St. S.E.           email:      luke at stat.umn.edu
Minneapolis, MN 55455 USA                    WWW:  http://www.stat.umn.edu
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