Format your dataframe into a long format. Then use a grouping variable to distinguish both lines.
library(ggplot2) DF <- data.frame(X = rep(0:20, 2), Y = c(rnorm(21), runif(21)), Z = gl(2, 21)) ggplot(data = DF, aes(x = X, y = Y, colour = Z)) + geom_line() HTH, Thierry PS. I suggest you read the ggplot book at http://had.co.nz/ggplot2/book.pdf ------------------------------------------------------------------------ ---- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 [EMAIL PROTECTED] www.inbo.be Do not put your faith in what statistics say until you have carefully considered what they do not say. ~William W. Watt A statistical analysis, properly conducted, is a delicate dissection of uncertainties, a surgery of suppositions. ~M.J.Moroney -----Oorspronkelijk bericht----- Van: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Namens sigalit mangut-leiba Verzonden: dinsdag 19 februari 2008 13:16 Aan: r-help Onderwerp: [R] qplot Hello, I have a question about "qplot": How can I add another line to the same plot ? (like function "lines" in "plot"). Thank You, Sigalit. [[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. ______________________________________________ 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.
