[R] Automatic re-looping after error

[Achim Zeileis]

On Thursday 09 October 2003 19:03, Ted Harding wrote:

> Hi Folks,
> I'm seeking advice about how to resume an outer loop following
> failure of a function within the loop (which issues an error
> message).
>
> Essentially, I'm repeating (simulating) a process which involves
> random sampling, EM and MCMC. I'm walking on very edge of rather
> thin ice -- data rather thinly spread over many parameters!
>
> Occasionally some component of the loop fails, with an error
> message. At this point, R quits the run altogether and returns to
> the command prompt. I then have to restart the whole script.
>
> All that's really needed to cope with the situation is for R to
> drop that cycle of the loop, and resume with a new cycle.
>
> However, I'm wondering how to set this up. I've had a look at
> try(), and I'm not at all sure that it does what I would want.
> What I'd really like is something (inside the loop) on the lines of
>
>    on.error(maybe some parameters X) break
>
> where X might specify what sort of error or what function it comes
> from. Would setting
>
>   options(error = break )
>
> do it?

Argh, didn't read carefully enough, sorry. Usually, I would expect 
from your description that try() would be good enough. You can "try()" 
the critical functions inside the loop and modify the actions inside 
the loop accordingly if something goes wrong...
Z

> Any other suggestions?
>
> With thanks,
> Ted.
>
>
> --------------------------------------------------------------------
> E-Mail: (Ted Harding) <Ted.Harding at nessie.mcc.ac.uk>
> Fax-to-email: +44 (0)870 167 1972
> Date: 09-Oct-03                                       Time: 18:03:37
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