The function matplot() is essentially designed for putting more than one line on a plot. It also works for interrupted lines. The trick is to have some columns that have one line segment, and other columns with the other segment. Try, for example: m1 <- matrix(c(1,2,NA,NA,NA,NA,NA,NA,3,4),5,2) m1 matplot(m1,type="l") Jon -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._