[ADMB Users] inner maxg = 0 infinite loop in ADMB-RE

H. Skaug hskaug at gmail.com
Wed Dec 22 23:21:12 PST 2010


The infinite loop indicates most likely that you allow too much variance
on you random effects. Start with a small range, and increase the range
until til problem starts occuring.

The "infinite lopp" is not a convenient diagnostic from a user perspective,
and it is on our to-fix list.


PS I have not looked at your code.

On Wed, Dec 22, 2010 at 7:02 PM, Motoki Wu <apewu at u.washington.edu> wrote:
> Hi ADMBeings,
> From simulated data, I am trying to estimate a delay-difference model
> with a Beverton-Holt stock recruitment curve with process error on the
> recruitment. Many times when my catch exceeds the biomass the inner
> gradient becomes 0 and loops indefinitely.
> I know this has been somewhat dealt with before, but I was wondering
> if the infinite loop is something intentional. I fully concede that my
> model could be wrong, but the current situation makes it difficult to
> test the code for a wide-ranging set of inputs w/o the need for manual
> intrusion.
> http://groups.google.com/group/admb-users/browse_thread/thread/b06eeb8a991f17e9
> I've archived a specific instance at:
> http://students.washington.edu/apewu/compare/
> "simulate6_RE_h05b" for the infinite loop
> "simulate6_RE_h07" for something that works
> Thanks
> Motoki Wu
> Quantitative Ecology & Resource Management
> University of Washington, Seattle
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