On Fri, Aug 29, 2014 at 3:53 AM, Angel Rodriguez <angel.rodrig...@matiainstituto.net> wrote: > > Dear subscribers, > > I've found that if there is a variable in the dataframe with a name very > similar to a new variable, R does not give the correct values to this latter > variable based on the values of a third value: > > <snip> > > Any clue for this behavior? > <snip> > > Thank you very much. > > Angel Rodriguez-Laso > Research project manager > Matia Instituto Gerontologico
That is unusual, but appears to be documented in a section from ?`[` <quote> Character indices Character indices can in some circumstances be partially matched (see pmatch) to the names or dimnames of the object being subsetted (but never for subassignment). Unlike S (Becker et al p. 358)), R never uses partial matching when extracting by [, and partial matching is not by default used by [[ (see argument exact). Thus the default behaviour is to use partial matching only when extracting from recursive objects (except environments) by $. Even in that case, warnings can be switched on by options(warnPartialMatchDollar = TRUE). Neither empty ("") nor NA indices match any names, not even empty nor missing names. If any object has no names or appropriate dimnames, they are taken as all "" and so match nothing. </quote> Note the commend about "partial matching" in the middle paragraph in the quote above. -- There is nothing more pleasant than traveling and meeting new people! Genghis Khan Maranatha! <>< John McKown ______________________________________________ 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.