[ADMB Users] no gradient 2.0

dave fournier davef at otter-rsch.com
Fri May 13 18:30:30 PDT 2011

Without looking at it in any depth I would suspect the pow function.
Consider th function sqrt(x).  if x==0 sqrt(x) is well defined, but the 
derivative is 1/(2*sqrt(x))
which is not well defined.  Exactly how this comes out of a pow I don't see,
but probably something like this is going on.

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