Hi, Use ?aggregate(), ?ddply() from library(plyr) etc. dat <- read.table(text="ua ELM PRP 122C MO 5 122C BR 3 122C FA 1 122C MO 1 122D BR 7 122D MO 2 122D BR 1",sep="",header=TRUE,stringsAsFactors=FALSE)
library(plyr) ddply(dat,.(ua,ELM),summarize,PRP=sum(PRP)) # ua ELM PRP #1 122C BR 3 #2 122C FA 1 #3 122C MO 6 #4 122D BR 8 #5 122D MO 2 A.K. On Tuesday, March 11, 2014 6:04 AM, catalin roibu <catalinro...@gmail.com> wrote: Hello all! I have a problem with R. How can I do this assemble the ELM PRP for each ua. My data is like this: ua ELM PRP 122C MO 5 122C BR 3 122C FA 1 122C MO 1 122D BR 7 122D MO 2 122D BR 1 and I want to obtain something like this: ua ELM PRP 122C MO 6 122C BR 3 122C FA 1 122D BR 8 122D MO 2 Thank you very much! -- --- Catalin-Constantin ROIBU Lecturer PhD, Forestry engineer Forestry Faculty of Suceava Str. Universitatii no. 13, Suceava, 720229, Romania office phone +4 0230 52 29 78, ext. 531 mobile phone +4 0745 53 18 01 +4 0766 71 76 58 FAX: +4 0230 52 16 64 silvic.usv.ro [[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. ______________________________________________ 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.
