Non-linear minimization
S?bastien Ballesteros wrote:
hello, I have got some trouble with R functions nlm(), nls() or optim() : I would like to fit 3 parameters which must stay in a precise interval. For exemple with nlm() : fn<-function(p) sum((dN-estdata(p[1],p[2],p[3]))^2) out<-nlm(fn, p=c(4, 17, 5), hessian=TRUE,print.level=2) with estdata() a function which returns value to fit with dN (observed data vactor) My problem is that only optim() allows me to set parameters interval with "L-BFGS-B" method but this one doesn't work in my case. I have heard about nls2 package (www.inra.fr/bia) but it doesn't work on Windows.
"it doesn't work on Windows" is a very gentle description in this particular case...
Do you know any solutions
A typical trick is to redefine the function so that for points outside the boundaries increasing penalties are added (if you know enough about your function). Uwe Ligges
Thank's a lot for reading my post Best regards Sebastien INA P-G ecology dpt
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