Dear All, I Have a dataframe like that:
Name1 Name2 category mauro francesco E234 luca giuseppe E5578 luca franco E5569 maria luca E4556 ... I would like to calculate the frequency of many time in my data I found in the list name: a<-read.table("pippo.csv",header=T,sep="\t") name1<-as.character(a[,1]) name2<-as.character(a[,2]) category<-as.character(a[,3]) for(i in 1:lenght(name1)){ re <-which(name1 == name2) } So how can create a table of frequncy of many times I found a name in column one respect to the second ? Thanks in advance for your help! M. ______________________________________________ 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.