michael wrote: > > Hi, > > Is there available package on the optimization function using > Newton-Raphson method (iterative quadratic approximation)? I have been > using > the 'optim' function in R and found it really unstable (it depends heavily > on the initial values and functional forms). If I have to code it by > myself, > can I get some advice on how to start (any good reference or sample code)? > I > really appreciate any help. >
Without an example of your "issue" you really can't expect helpful answers. What are you trying to do? Solving a system of nonlinear equations? (you could have a look at package nleqslv) Minimizing/maximizing a function? (R also provides the function nlm) You should have a look at the CRAN Task View page Optimization and Mathematical Programming (http://cran.r-project.org/web/views/Optimization.html) Berend -- View this message in context: http://r.789695.n4.nabble.com/Need-help-on-Newton-Raphson-optimization-tp3734578p3735014.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
