The R help is sublime - which can be lost on the beginner (it was on me). See Chapter 12 Graphical procedures of the introduction to R manual (http://cran.r-project.org/manuals.html). Then read the rest of the manual before bed. As for getting red and a solid line? plot(1:100, log(1:100), type = "l", col = "red", lty = "solid") Good luck, Andy