I appologize for the lack of information in my previous mail, but it is my first one.
Yes I red -in part- the Port documentation to learn what does the message X-convergence (3) mean. so this is my nlminb and the results : res1<-nlminb(parametres[,3], V, lower=c(rep(0.01, 18), rep(0.01, 3), rep(-Inf, 6)), upper=c(rep(Inf, 18), rep(0.99, 3), rep(Inf, 6)), control = list(maxit=1000) ) Results : > res1 $par [1] 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 [8] 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 1.0000000 [15] 1.0000000 1.0000000 1.0000000 1.0000000 0.6899225 0.7993528 0.6480687 [22] 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 0.0000000 $objective [1] Inf $convergence [1] 0 $message [1] "X-convergence (3)" $iterations [1] 1 $evaluations function gradient 2 27 So as you see, it stops after just one iteration but it is converging. Thanks 2010/12/15 Jonathan P Daily <jda...@usgs.gov> > How are we supposed to help you if we have no idea how you are using it? > Did you read the PORT documentation? Did you look at the control > parameters outlined in the function help page? Often times for me a return > of the initial conditions is an issue with either inappropriate tolerance > or having variables on very different scales. > > Since you did not follow the posting guide (important part *'d below), my > only suggestion is to ?nlminb > -------------------------------------- > Jonathan P. Daily > Technician - USGS Leetown Science Center > 11649 Leetown Road > Kearneysville WV, 25430 > (304) 724-4480 > "Is the room still a room when its empty? Does the room, > the thing itself have purpose? Or do we, what's the word... imbue it." > - Jubal Early, Firefly > > r-help-boun...@r-project.org wrote on 12/15/2010 08:53:39 AM: > > > [image removed] > > > > [R] Help about nlminb function > > > > kamel gaanoun > > > > to: > > > > r-help > > > > 12/15/2010 08:56 AM > > > > Sent by: > > > > r-help-boun...@r-project.org > > > > Hi Everyone, > > > > Can anyone help me resolve a problem that i'm having with nlminb. The > > problem is that it stops after just one iteration and returns the same > > values as "start" ones. > > > > > > Thank you very much for your help. > > > > > > Sincerely. > > > > > > -- > > Kamel Gaanoun > > (+33) (0)6.76.04.65.77 > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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. > > ****************************************************************************** > > -- Kamel Gaanoun (+33) (0)6.76.04.65.77 [[alternative HTML version deleted]] ______________________________________________ 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.