?try 
Or
?tryCatch

Bert

Sent from my iPhone -- please excuse typos.

> On Dec 2, 2014, at 12:57 PM, Ramiro Barrantes <ram...@precisionbioassay.com> 
> wrote:
> 
> Hello,
> 
> I am trying to fit many hundreds of simulated datasets using NLME (it's all 
> in a big loop in R).  Some don't seem to converge.  I am working on 
> addressing the issues by perhaps adjusting my simulation, or tweaking 
> iteration steps in nlme, etc.  However, when it doesn't converge, NLME just 
> hangs, and my program either stalls for hours/days or takes over the computer 
> memory and everything crashes eventually.  Is there a way to tell nlme to 
> stop when it doesn't seem to be converging somehow?   I have been looking at 
> the parameters in nlmeControl() but see nothing obvious.
> 
> Thanks in advance,
> 
> Ramiro
> 
>    [[alternative HTML version deleted]]
> 
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