Re: [R] filtering number of values in a data frame

(unname(split(DF,list(DF$X1,DF$START),drop=TRUE)), function(.df) { data.frame(.df[1,1:4],count=nrow(.df)) })) On Jun 18, 2009, René Schönemann wrote: Dear list, given is the following data frame df(): Number Place Start End 1 218024740787 HHO 5 263 2008-01-02 00:21:14 2008-01-03 15:25:16

[R] filtering number of values in a data frame

1 Does anybody can help me with this? Thanking you in advance! René Schönemann -- __ Technische Universität Berlin Institut für Land- und Seeverkehr Fachgebiet Schienenfahrwege und Bahnbetrieb Prof. Dr.-Ing. habil. Jürgen Siegmann Post