?uniroot -- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111
> -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] On Behalf Of li li > Sent: Wednesday, February 24, 2010 2:31 PM > To: Bert Gunter > Cc: r-help > Subject: Re: [R] Inverse function > > This is not a homework problem. > > How to solve numerically for y from f(y,r) - a=g(y)=0? I am not too > sure. > > Thanks! > Hannah > > > 2010/2/24 Bert Gunter <gunter.ber...@gene.com> > > > 1. Is this a homework problem? > > > > 2. Etiquette on this list is to sign with your full real name. > Adhering to > > the list etiquette may enhance your chance of a useful response, > especially > > in view of (1), as we (or at least some of us) do not wish to do > students' > > homework for them. > > > > 3. Hint: f(y,r) = a <==> g(y) = 0 where g(y) == f(y,r) - a > > (for numerical solutions). > > > > > > Bert Gunter > > Genentech Nonclinical Biostatistics > > > > -----Original Message----- > > From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- > project.org] > > On > > Behalf Of li li > > Sent: Wednesday, February 24, 2010 12:46 PM > > To: r-help > > Subject: [R] Inverse function > > > > Hi all, > > I have a function like the following: > > > > f <- function(r, > > y){r/(2*pi)*exp(1)^(-y)*(1+r*(y/2)+r^(2)*(y-1)^(2)/6)} > > > > For fixed r, I want to find the inverse funtion in terms y. > > In other words, for fixed r, if the value of the function is given, I > want > > to > > find the corrsponding y value that will achieve the specific function > > value. > > > > Can anyone help me? > > Hannah > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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<http://www.r- > project.org/posting-guide.html> > > and provide commented, minimal, self-contained, reproducible code. > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ______________________________________________ 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.
