Erin Hodgess wrote: > Hi R People: > > I'm reading "Statistical Computing with R", by Maria Rizzo, and it's > really good. > > Anyhow, I have a question about something in there. > > >> u <- runif(5) >> u >> > [1] 0.1177041 0.4271790 0.4601597 0.2204846 0.4051473 > >> #in the book >> sum(as.integer(u > 0.4)) >> > [1] 3 > >> #what I would do >> sum(u > 0.4) >> > [1] 3 > > > Is one way better than the other, please? > > Thanks, > Erin > > I'd do what you'd do, but I suppose that the author felt that it was clearer to make the coercion explicit. In terms of speed, your version is likely faster (but what would you do with those extra 17 microseconds of life?).
-p -- O__ ---- Peter Dalgaard Øster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ 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.
