I am using rpart() using R v. 1.3.0 under Windows 2000. I tried to run the routine with the following command: a1<-rpart(X1~X2+X3,data=prova) and it turns out with the following error message: Error in matrix(c(rp$isplit[, 2:3], rp$dsplit), ncol = 5, dimnames = list(tname[rp$isplit[, : length of dimnames[1] not equal to array extent the dataset prova has been imported in R using the command read.table. Apparently, it seems that the file has been correctly imported. Any help will be appreciated! thanks in advance! Claudio -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._