On 12-Oct-09 13:24:01, Terry Therneau wrote: > ---------- begin included -------- > Greetings! > I want to follow the evolution of a Nelder-Mead function > minimisation (a function of 2 variables). Hence each simplex > will have 3 vertices. > > Therefore I would like to have a function which can output > the coordinates of the 3 vertices after each new simplex > is generated. However, there seems to be no way (which I can > detect) of extracting this information from optim() (the 'trace' > argument to 'control' does not seem to have provision for this, > according to '?optim', and I have tried it out without success). > > --- end include ----- > > Why not put a cat() statement into "fn", the function that you supply > which optim is calling? That will give the vertices that it tries one > by one. > > Terry T.
That's neat and simple! It hadn't occurred to me. Thanks! Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 12-Oct-09 Time: 14:32:08 ------------------------------ XFMail ------------------------------ ______________________________________________ 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.
