At 12:19 AM 3/4/2009, you wrote: >plot(x,rho,pch=id) Or this. Tim > dat id x rho 1 A 1 0.1 2 B 20 0.5 3 C 2 0.9 > labels<-dat$id > labels [1] "A" "B" "C" > plot(dat$x,dat$rho,pch=labels)