fyi On my machine match runs *much* faster... > t0 <- Sys.time(); for (i in 1:reps) { match(Y,X) }; print(Sys.time() - t0) Time difference of 0.1570001 secs > t0 <- Sys.time(); for (i in 1:reps) { sapply(Y,function(Y){which(Y==X)}) > }; print(Sys.time() - t0) Time difference of 6.093 secs > 6.09/.157 [1] 38.78981
Regards, Sean Peter Dalgaard wrote: > > Ingmar Visser wrote: >> does this do what you want? >> >> sapply(y,function(y){which(y==x)}) >> > Maybe, but match(Y,X) would be more to the point. > >> hth, Ingmar >> >> On 28 Nov 2007, at 15:53, Serguei Kaniovski wrote: >> >> >>> Hallo, >>> >>> I have two vectors of different lengths which contain the same set of >>> values: >>> >>> X < -c(2,6,1,7,4,3,5) >>> Y <- c(1,1,6,4,6,1,4,1,2,3,6,6,1,2,4,4,5,4,1,7,6,6,4,4,7,1,2) >>> >>> How can I replace the values in Y with the index (!) of the >>> corresponding >>> values in X. So 2 appears in X in the first coordinate, so all 2�s >>> in Y >>> should be replaced by 1, etc. >>> >>> Thank you for your help, >>> Serguei >>> >>> ________________________________________ >>> Austrian Institute of Economic Research (WIFO) >>> >>> P.O.Box 91 Tel.: +43-1-7982601-231 >>> 1103 Vienna, Austria Fax: +43-1-7989386 >>> >>> Mail: [EMAIL PROTECTED] >>> http://www.wifo.ac.at/Serguei.Kaniovski >>> [[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. >>> >> >> Ingmar Visser >> Department of Psychology, University of Amsterdam >> Roetersstraat 15 >> 1018 WB Amsterdam >> The Netherlands >> t: +31-20-5256723 >> >> >> >> [[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. >> > > > -- > 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. > > -- View this message in context: http://www.nabble.com/Replacing-values-job-tf4889131.html#a14021232 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.