Or just ask let the second plot know to add it to the existing plot: set.seed(2) plot(ecdf(rnorm(50))) plot(ecdf(rnorm(50,,2)), add = TRUE, pch = 2) legend(-2.9, .95, legend = c("First ECDF", "Second ECDF"), pch = c(16, 2))
note the limits are set by the first plot, so watch out for that. You may want to explicitly set xlim to avoid problems. set.seed(2) plot(ecdf(rnorm(50)), xlim = c(-4.5, 4.5)) plot(ecdf(rnorm(50,,2)), add = TRUE, pch = 2) legend(-4.2, .95, legend = c("First ECDF", "Second ECDF"), pch = c(16, 2)) Cheers, Josh On Sat, Sep 24, 2011 at 10:04 AM, R. Michael Weylandt <michael.weyla...@gmail.com> wrote: > What version of R are you using? > > x = ecdf(rnorm(50)); y = ecdf(rnorm(50)) > > plot(x); lines(y, col=2) > > works for me on R 2.13.1. Specifically, there is a lines.stepfun method > (albeit non-visible) which handles this. > > Michael > > On Sat, Sep 24, 2011 at 12:23 PM, Adel ESSAFI <adel.s...@imag.fr> wrote: > >> Hello, >> >> is ot possible to draw two ecdf of vectors (say s1 and s2) on the same >> figire with R. >> >> plot function draws a new plot and there is no function like points or >> lines >> to draw a second ecdf on the figure. >> >> Regards >> >> >> -- >> *PhD candidate in Computer Science >> Address >> 3 avenue lamine, cité ezzahra, Sousse 4000 >> Tunisia >> tel: +216 97 246 706 >> fax: +216 71 391 166* >> >> [[alternative HTML version deleted]] >> >> >> ______________________________________________ >> R-help@r-project.org mailing list >> https://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guide >> http://www.R-project.org/posting-guide.html >> and provide commented, minimal, self-contained, reproducible code. >> >> > > [[alternative HTML version deleted]] > > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > -- Joshua Wiley Ph.D. Student, Health Psychology Programmer Analyst II, ATS Statistical Consulting Group University of California, Los Angeles https://joshuawiley.com/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.