I've tried both mean and colMean. I did success with one attempt using mean, however if only have 1 year and its a NA then I get NaN ( which I can replace). I'll keep trying.
On Mon, Apr 26, 2010 at 12:26 AM, Petr PIKAL <petr.pi...@precheza.cz> wrote: > Hi > > r-help-boun...@r-project.org napsal dne 26.04.2010 06:52:55: > > > Having some difficulties with understanding how tapply works and getting > > return values I expect > > > > Data: dataframe. DF DF$Id $D $Year....... > > > > Id D Year Jan Feb Mar Apr May Jun Jul Aug Sep > Oct > > Nov Dec > > 11264402000 1 1980 NA NA NA NA NA 212 203 209 228 237 NA > NA > > 11264402000 0 1981 NA NA 243 244 NA NA NA NA 225 NA 231 > NA > > 11264402000 1 1981 NA 251 NA 248 241 NA NA NA 235 NA NA > 245 > > 11264402000 0 1982 236 237 242 240 242 205 199 NA NA NA NA > NA > > 11264402000 1 1982 236 NA NA 240 242 NA NA NA NA NA NA > NA > > 11264402000 0 1983 NA 247 NA NA NA NA NA 205 NA NA NA > NA > > 11264402000 1 1983 NA 247 NA NA NA NA NA NA NA 225 NA > NA > > 11264402000 0 1986 NA NA NA 240 NA NA NA 213 NA NA NA > NA > > 11264402000 0 1987 241 NA NA NA NA 218 NA NA 235 243 240 > NA > > 11264402000 1 1987 NA NA NA NA NA 218 NA NA 235 243 240 > NA > > 11264402000 3 1987 NA NA NA NA NA 218 NA NA 235 243 240 > NA > > 11264402000 0 1988 238 246 249 NA 244 213 212 224 232 238 232 > 230 > > 11264402000 1 1988 238 246 249 246 244 213 212 224 232 NA NA > 230 > > 11264402000 3 1988 238 246 249 246 244 213 212 224 232 NA NA > 230 > > 11264402000 0 1989 232 233 238 239 231 NA 215 NA NA NA NA > 238 > > 11264402000 1 1989 232 233 238 239 231 NA NA NA NA NA NA > 238 > > 11264402000 3 1989 232 233 238 239 231 NA NA NA NA NA NA > 238 > > > > and the result should be a dataframe of column means by year with the > > variable D dropped (or kept doesnt matter) > > > > 11264402000 1 1980 NA NA NA NA NA 212 203 209 228 237 NA > NA > > 11264402000 .5 1981 NA NA 243 244 NA NA NA NA 225 NA 231 > NA > > 11264402000 .5 1982 236 237 242 240 242 205 199 NA NA NA NA > NA > > 11264402000 .5 1983 NA 247 NA NA NA NA NA 205 NA 225 NA > > NA > > 11264402000 1 1986 NA NA NA 240 NA NA NA 213 NA NA NA > NA > > 11264402000 2 1987 241 NA NA NA NA 218 NA NA 235 243 240 > NA > > 11264402000 1.33 1988 238 246 249 246 244 213 212 224 232 238 > 232 > > 230 > > 11264402000 1.33 1989 232 233 238 239 231 NA 215 NA NA NA > NA > > 238 > > > > It would seem that Tapply should work > > result<-tapply( DF[,1:15], DF$Year, colMeans,na.rm=T) > > Why colMeans? It is function used instead of apply(...,.. ,mean). > > Maybe you want > > result<-tapply( DF[,1:15], DF$Year, mean,na.rm=T) > > Regards > Petr > > > > > but i get errors about the length of arguments, which > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > 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]] ______________________________________________ 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.
