Hi Syrvn,
how about this
dtf<-read.table(textConnection("Letter Number
a 1
a 1
b 1
b 0
c 0
c 1
d 0
d 0"),header=T)
aggregate(Number~Letter,data=dtf,max)cheers. Am 13.10.2011 18:42, schrieb syrvn: > Hi, > > > imagine the following matrix/data.frame > > Letter Number > a 1 > a 1 > b 1 > b 0 > c 0 > c 1 > d 0 > d 0 > > If the numbers for two identical letters are also identical then I want to > remove either the first or the > second row of that letter. If for a letter the numbers are 1 and 0 I want to > remove the row with the 0. > > That means if the code works I would and up with the following > matrix/data.frame > > Letter Number > a 1 > b 1 > c 1 > d 1 > > > Many thanks, > Syrvn > > > -- > View this message in context: > http://r.789695.n4.nabble.com/Remove-specific-rows-in-a-matrix-data-frame-tp3902149p3902149.html > 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. -- Eik Vettorazzi Department of Medical Biometry and Epidemiology University Medical Center Hamburg-Eppendorf Martinistr. 52 20246 Hamburg T ++49/40/7410-58243 F ++49/40/7410-57790 -- Pflichtangaben gemäß Gesetz über elektronische Handelsregister und Genossenschaftsregister sowie das Unternehmensregister (EHUG): Universitätsklinikum Hamburg-Eppendorf; Körperschaft des öffentlichen Rechts; Gerichtsstand: Hamburg Vorstandsmitglieder: Prof. Dr. Guido Sauter (Vertreter des Vorsitzenden), Dr. Alexander Kirstein, Joachim Prölß, Prof. Dr. Dr. Uwe Koch-Gromus ______________________________________________ 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.
