Dear All, I have tried to calculate tree mean growth but I think the structure I used below (growthresumo) is not the most elegant, even though it worked. The only problem I had in this first part was that I cannot use 'summary', just 'mean' (sorry but 'R' is pretty new for me).
>growthresumo <- >aggregate(growth[,c(16,19,23,27,31,35,39,43,47,52,56,60,64,68,72,76,81,85,89,93,97,101,105,109,113,117,121,125,129,133,137, 141,145,149,153,157,161,165,169,173,177,181,185,189,194,197,201,205,209,213,217,221,225,229,233,237,241)], by=(growth[,c(3,8)]),MEAN,na.rm=TRUE) #after growth is calculated, I want to stack the results in just one colunm. >growthvertical <- c(growthresumo[,3],...,growthresumo[,50]) # this is very >time consuming though >Parcel <- c("C9","S8"..."C9","S8") # 50 items >date < c("DATE1"...."DATE50") >growthpermonth <- data.frame(Parcel, Date, growthvertical) Thank you very much! Paulo Paulo Brando Inst. de Pesquisa Ambiental da Amazônia (IPAM) Rua Rui Barbosa,136. 68.005.080 Santarém, PA, Brasil. Fone/Fax ++ 55 93 522 5538 www.ipam.org.br [[alternative HTML version deleted]] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html