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

dave fournier otter at otter-rsch.com
Thu Dec 23 02:40:48 PST 2010

I can't stand the idea of revisitng this model. However there is
a general approach to fitting models where one variable (here the 
biomass) must be >0 and you are removing something from it (here the 
catch)  whihc may be greater than the biomass for bad values of the
model parameters.

start with

                 B - C

this is the same as


which to first order is the same as


and works for C>B

you can get it more accurate  by splitting up the time step as it were
to get


You would think they would know this stuff in the univeristies by now.

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