> -----Mensaje original----- > De: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] En nombre de JamesHuang > Enviado el: jueves, 29 de abril de 2010 3:38 > Para: r-help@r-project.org > Asunto: Re: [R] non linear estimation > > > any suggestion? actually I just wanna know if there is a > package for non linear estimation with restriction, thanks. I > am a new for R....
I do not know if there is any specific package for optimization with restrictions, but you can use optim with method="L-BFGS-B" This only lets you set bounds of single parameters, so for restrictions such as a+b<19 in Y=a+(b+c*x)*exp(-d*x) you could deduce your restrictions in terms of single parameters (for example, in your original mail you put that a>10, a+b<19, and b<3, so the restriction a+b>19 is actually redundant), or else you could think of some re-parameterization that would put a+b (and all other multi-par restrictions) as a single parameter. Wait, is this a homework? ____________________________________________________________________________________ Dr. Rubén Roa-Ureta AZTI - Tecnalia / Marine Research Unit Txatxarramendi Ugartea z/g 48395 Sukarrieta (Bizkaia) SPAIN ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
