Dear R users, I am currently trying to create my first personnal function and use it with the apply function. The purpose of this function is to create a vector summarizing the number of levels in a given selection of data.frame columns. I tried to transpose the indexation method used by the nlevels function but it doesn't seem to work. I did not find anything uesful in the archives so could someone point to me where my mistake(s) is (are) ?
Thanks in advance Sebastien #------------------------- mydata<-data.frame(1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6,1:6) mycol.index<-c(1,5,3) nelem<-function(x,col.id) nlevels(factor(x[,col.id])) my.nlevels.col<-apply(mydata,2,nelem,mycol.index) my.nlevels.col #---------------------------- #The error message is the following #>Error in x[, col.id] : incorrect number of dimensions ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.
