[R] Automatic re-looping after error

[(Ted Harding)]

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?

Any other suggestions?

With thanks,
Ted.


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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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