[R] optim function : "BFGS" vs "L-BFGS-B"

Kang.Changku@epamail.epa.gov Kang.Changku at epamail.epa.gov
Mon Jan 5 23:42:52 CET 2004

Well, thanks for your quick response.
In fact, I have another question.
There is a function in Splus, "nlminb". I want to do the same things
in R. According to help, nlminb function uses a quasi-Newton
method and this minimization is subject to box constraint. So, in
this sense I tried to use "BFGS" and "L-BFGS-B". But in both cases,
I couldn't get same result. I'm not sure which method coincide with
that of Splus or at least more similar.
Any suggestions would be very welcome.

Changku Kang
National Center for Environmental Assessment
EPA  (B211F)
919-541-0245 (fax)
Kang.Changku at epa.gov

Graduate Student
Department of Statistics, NCSU
ckang2 at stat.ncsu.edu

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