And another way: library(plyr) ddply(dta,"A",summarise,B=length(B))
Felipe D. Carrillo Supervisory Fishery Biologist Department of the Interior US Fish & Wildlife Service California, USA http://www.fws.gov/redbluff/rbdd_jsmp.aspx From: David L Carlson <dcarl...@tamu.edu> >To: 'Mat' <matthias.we...@fnt.de>; r-help@r-project.org >Sent: Monday, December 10, 2012 7:43 AM >Subject: Re: [R] Count cell Count by her frequency > >You request is not completely clear. I am assuming you want to count the >number of different characters in B for each category in A: > >> A <- c("10-1", "10-1", "10-1", "10-2", "10-3") >> B <- c("aaa", "bbb", "abc", "vvv", "ggg") >> dta <- data.frame(A, B) >> dta > A B >1 10-1 aaa >2 10-1 bbb >3 10-1 abc >4 10-2 vvv >5 10-3 ggg >> a1 <- tapply(dta$B, dta$A, paste0, collapse="") >> a2 <- strsplit(a1, "") >> a3 <- lapply(a2, unique) >> a4 <- sapply(a3, length) >> dtanew <- data.frame(A=names(a4), B=a4, row.names=1:length(a4)) >> dtanew > A B >1 10-1 3 >2 10-2 1 >3 10-3 1 > >---------------------------------------------- >David L Carlson >Associate Professor of Anthropology >Texas A&M University >College Station, TX 77843-4352 > >> -----Original Message----- >> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- >> project.org] On Behalf Of Mat >> Sent: Monday, December 10, 2012 2:50 AM >> To: r-help@r-project.org >> Subject: [R] Count cell Count by her frequency >> >> Hello togehter, i have a data.frame, with value like this: >> >> A B >> 1 10-1 aaa >> 2 10-1 bbb >> 3 10-1 abc >> 4 10-2 vvv >> 5 10-3 ggg >> >> I want now a evaluation, which character is how often in my data.frame. >> Like >> this one: >> A B >> 1 10-1 3 >> 2 10-2 1 >> 3 10-3 1 >> >> How can i do this? >> >> Thank you. >> >> Mat >> >> >> >> -- >> View this message in context: http://r.789695.n4.nabble.com/Count-cell- >> Count-by-her-frequency-tp4652650.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. > >______________________________________________ >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.
