You are starting to sound like Dr Nash [1]... "use optimr". [1] https://stat.ethz.ch/pipermail/r-help/2018-July/458498.html
On March 14, 2020 2:27:48 PM PDT, Abby Spurdle <spurdl...@gmail.com> wrote: >###################################################### >I ran <while (TRUE) 0> before posting, and waited a while... >(Re: The posting guide, which I'm going to start putting a lot more >weight on). > >Noting, I was wondering if the posting guide has a mistake, because ><4*runif(1)> doesn't do anything special... >(Hopefully, Martin is reading this...). > >And I'm planning to make this my last post in this thread... >###################################################### >Here's a much simpler example of the problem: > >optim (4, dnorm, method="CG", control = list (fnscale=-1) )$par > >This problem isn't limited to objective functions of one variable. >I tried similar problems with functions of two, three and four >variables. >And the same thing happened. > >I'm not sure if this is a bug in the R code, or not. > >If it's a bug... > >And if it's not a bug, I'm struggling to see why anyone would want to >use this method in an applied setting... > > >On Fri, Mar 13, 2020 at 3:42 AM Duncan Murdoch ><murdoch.dun...@gmail.com> wrote: >> >> It looks like a bug in the CG method. The other methods in optim() >all >> work fine. CG is documented to be a good choice in high dimensions; >why >> did you choose it for a 1 dim problem? >> >> Duncan Murdoch > >______________________________________________ >R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see >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. -- Sent from my phone. Please excuse my brevity. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
