Hello, My name is Francisco Vera. I have a small problem with the names produced by the function data.frame. If you run the code below, you will notice that the names of b1 are correct except for the first variable. This problem does not happen in the case of b2. a1<-sapply(1:5,function(x) rmultinom(x,20,1:4/10)) a2<-sapply(2:6,function(x) rmultinom(x,20,1:4/10)) b1<-data.frame(a1) b2<-data.frame(a2) The version of R I am using is 1.8.0. My OS is Windows XP Thanks for your reviewing and possibly fixing this bug Francisco Vera Department of Statistics University of South Carolina Columbia, SC 29208