From: Jim Lindsey <jlindsey@luc.ac.be> Message-Id: <9803121845.AA17133@alpha.luc.ac.be> Subject: Re: R-beta: nonlinear fitting To: wsimpson@uwinnipeg.ca (Bill Simpson) Date: Thu, 12 Mar 1998 19:45:15 +0100 (MET) In-Reply-To: <Pine.OSF.3.95.980312120136.3505C-100000@io.uwinnipeg.ca> from "Bill Simpson" at Mar 12, 98 12:03:32 pm > > Hi Jim, > > Thanks very much for your help. > > I did what you said: > > x > [1] 1 2 3 4 5 6 > > y > [1] 0.5000000 0.3979262 0.3551846 0.3305826 0.3142192 0.3023836 > > fn <- function(p) (y-p[1]*x^p[2]+p[3])^2 sorry that should have been: fn <- function(p) sum((y-p[1]*x^p[2]+p[3])^2) It's sum of squares of course! Jim > > nlm(fn,p=c(0.3,-0.6,0.2)) > Error: invalid function value in optimizer > > As you can see it didn't work. What went wrong? > > Thanks very much for any help. > > Best wishes, > Bill > > -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request@stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._