Thank you for your clarification. At 11:04 05.07.2006 +0100, Prof Brian Ripley wrote: >On Tue, 4 Jul 2006, Heinz Tuechler wrote: > >> Dear All, >> >> as shown in the example, unique() deletes names of vector elements. >> Is this intended? > >Yes. Think of the vector as a set: it is supposed to immaterial which of >the duplicated elements is retained. > >The help page says > > An object of the same type of 'x'. but if an element is equal to > one with a smaller index, it is removed. > >so it is starting with a new object, not 'x'. However, the array method >works differently, so the documentation needs clarification. > >> Of course, one can use indexing by !duplicated() instead. > >Be careful, as you might get a method for [ and that might not do want you >intended (e.g. for a time series). > > >> Greetings, >> Heinz >> >> ## unique deletes names >> v1 <- c(a=1, b=2, c=3, e=2, a=4) >> unique(v1) # names deleted >> >> v1[!duplicated(v1)] # names preserved >> >> >> platform i386-pc-mingw32 >> arch i386 >> os mingw32 >> system i386, mingw32 >> status Patched >> major 2 >> minor 3.1 >> year 2006 >> month 07 >> day 01 >> svn rev 38471 >> language R >> version.string Version 2.3.1 Patched (2006-07-01 r38471) >> >> ______________________________________________ >> [email protected] mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >> > >-- >Brian D. Ripley, [EMAIL PROTECTED] >Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ >University of Oxford, Tel: +44 1865 272861 (self) >1 South Parks Road, +44 1865 272866 (PA) >Oxford OX1 3TG, UK Fax: +44 1865 272595 > >
______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
