For this case it is quite simple, see ?ifelse > z <- ifelse( x > 0, y, -y )
Hope this helps, -- 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 Steve Jaffe > Sent: Tuesday, July 07, 2009 1:42 PM > To: r-help@r-project.org > Subject: [R] vectorizing a function > > > I'm sure I'm missing something obvious but I'm not seeing how to simply > "vectorize" a function of two or more variables. > > Say I have > f <- function(x,y) if (x>0) y else -y > > Now I have vectors x and y of equal length and I'd like to apply f > element-wise. I.e. conceptually > z <- f(x,y) where x, y, z are vectors of the same length > > Some magic involving apply? > > Thanks > -- > View this message in context: http://www.nabble.com/vectorizing-a- > function-tp24380064p24380064.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > 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.
