search for: ruegg

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2006 Aug 09
1
scaling constant in optim("L-BFGS-B")
...nstant" that tricks the algo to converge, but does not have a systematic justification)? I'd greatly appreciate any hints, tricks or references about the scaling constant Thanks for your help! Simon ******************************************************************** Simon Ruegg Dr.med.vet., PhD student Institute for Parasitology Winterthurstr. 266a 8057 Zurich Switzerland phone: +41 44 635 85 93 fax: +41 44 635 89 07 e-mail: s.ruegg@access.unizh.ch [[alternative HTML version deleted]]
2007 Jan 10
2
problems with optim, "for"-loops and machine precision
...bove, the same impossible results occurred again. Can anyone tell me where I should be looking for the problem, or what it is and how I could solve it? Thanks a lot for your help Sincerely Simon ******************************************************************** Simon Ruegg Dr.med.vet., PhD candidate Institute for Parasitology Winterthurstr. 266a 8057 Zurich Switzerland phone: +41 44 635 85 93 fax: +41 44 635 89 07 e-mail: s.ruegg@access.unizh.ch [[alternative HTML version deleted]]
2006 Aug 26
1
problems with loop
...uot; || tmp2=="NaN"){tmp2=-700} LLsum=LLsum+tmp1+tmp2 } } } } return(-LLsum) } ******************************************************************** Simon Ruegg Dr.med.vet., PhD student Institute for Parasitology Winterthurstr. 266a 8057 Zurich Switzerland phone: +41 44 635 85 93 fax: +41 44 635 89 07 e-mail: s.ruegg@access.unizh.ch [[alternative HTML version deleted]]