From ripley at stats.ox.ac.uk  Tue Jan  3 09:36:21 2006
From: ripley at stats.ox.ac.uk (Brian D Ripley)
Date: Tue, 3 Jan 2006 08:36:21 +0000 (GMT)
Subject: [Rd] checkpointing
In-Reply-To: <1136241618.5636.10.camel@iron.psg.net>
Message-ID: <Pine.GSO.4.31.0601030832230.5822-100000@markov.stats>

I use save.image() or save(), which seem exactly what you are asking for.

On Mon, 2 Jan 2006, Ross Boylan wrote:

> I would like to checkpoint some of my calculations in R, specifically
> those using optim.  As far as I can tell, R doesn't have this facility,
> and there seems to have been little discussion of it.
>
> checkpointing is saving enough of the current state so that work can
> resume where things were left off if, to take my own example, the system
> crashes after 8 days of calculation.
>
> My thought is that this could be added as an option to optim as one of
> the control parameters.
>
> I thought I'd check here to see if anyone is aware of any work in this
> area or has any thoughts about how to proceed.  In particular, is save a
> reasonable way to save a few variables to disk?  I could also make the
> code available when/if I get it working.

-- 
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 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595



[Rd] checkpointing
Brian D Ripley