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 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.
