I have read that when the gradient function is not supplied (is null) then first order differencing is used to find the differential. I was trying to track down this for my own information but I run into .Internal(optim.....). I was not sure where to look next to see the function that is automatically supplied for the gradient. Thank you. Kevin
see the fmingr function in src/main/optim.c (https://svn.r-project.org/R/trunk/src/main/optim.c) On Wed, 25 Feb 2009 rkevinburton at charter.net wrote:> I have read that when the gradient function is not supplied (is null) > then first order differencing is used to find the differential. I was > trying to track down this for my own information but I run into > .Internal(optim.....). I was not sure where to look next to see the > function that is automatically supplied for the gradient. > > Thank you. > > Kevin > > ______________________________________________ > R-help at 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. >
Thank you. I saw the source. But I am not sure how to get from .Internal(optim(...)) to fmingr. Kevin ---- Katharine Mullen <kate at few.vu.nl> wrote:> see the fmingr function in src/main/optim.c > (https://svn.r-project.org/R/trunk/src/main/optim.c) > > On Wed, 25 Feb 2009 rkevinburton at charter.net wrote: > > > I have read that when the gradient function is not supplied (is null) > > then first order differencing is used to find the differential. I was > > trying to track down this for my own information but I run into > > .Internal(optim.....). I was not sure where to look next to see the > > function that is automatically supplied for the gradient. > > > > Thank you. > > > > Kevin > > > > ______________________________________________ > > R-help at 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. > >