Try this x <- seq(0,15,0.01) plot(x+1, dexp(x, 0.2), c(0,15), c(0,0.8),type="l", ylab="f(x)") lines(x+1, dexp(x, 0.8)) grid() abline(v=1, col="lightgray", lty="dotted",) Best ep -- View this message in context: http://r.789695.n4.nabble.com/Exponential-distribution-tp3394476p3395829.html Sent from the R help mailing list archive at Nabble.com.