Dear Ronaldo, You were almost there! Here is a suggestion: with(test, tapply(var3, var2, length)) # a b c d e # 2 1 1 1 1
HTH, Jorge 2009/9/1 Ronaldo Reis Júnior <> > Hi, > > this is a simple question > > I have this data.frame: > > > test <- > > data.frame(var1=c(1,1,1,1,1,1),var2=c("a","a","b","c","d","e"),var3=c("a1","a1","b1","a1","c1","d1")) > > test > var1 var2 var3 > 1 1 a a1 > 2 1 a a1 > 3 1 b b1 > 4 1 c a1 > 5 1 d c1 > 6 1 e d1 > > Then I need to calculate the number of var3 excluding the repeated measure > of > var2. > > With tapply I have this: > > > tapply(test$var1,test$var3,sum) > a1 b1 c1 d1 > 3 1 1 1 > > But the correct result is: > > a1 b1 c1 d1 > 2 1 1 1 > > because on factor "a1" in var3 I have 2 repeated factor "a" in var2. > > I try a simple solution for it but without success. aggregate function dont > work with factors (var3 by var1). > > Anybody have an idea? > > Thanks > Ronaldo > -- > "It's men like him that give the Y chromosome a bad name." > -- > > Prof. Ronaldo Reis Júnior > | .''`. UNIMONTES/DBG/Lab. Ecologia Comportamental e Computacional > | : :' : Campus Universitário Prof. Darcy Ribeiro, Vila Mauricéia > | `. `'` CP: 126, CEP: 39401-089, Montes Claros - MG - Brasil > | `- Fone: (38) 3229-8192 | ronaldo.r...@unimontes.br | > chrys...@gmail.com > | http://www.ppgcb.unimontes.br/lecc | ICQ#: 5692561 | LinuxUser#: 205366 > -- > Favor NÃO ENVIAR arquivos do Word ou Powerpoint > Prefira enviar em PDF, Texto, OpenOffice (ODF), HTML, or RTF. > > ______________________________________________ > 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. > [[alternative HTML version deleted]]
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