On 07/02/16 01:11, jupiter wrote: > Hi, > > I am just starting to learn R, sorry for asking a simple question. How can > plot a line x <= 0 y = 0, x > 0 y = 1? One way: plot(c(-1,0,1),c(0,1,1),type="s",xlab="x",ylab="y") cheers, Rolf Turner -- Technical Editor ANZJS Department of Statistics University of Auckland Phone: +64-9-373-7599 ext. 88276