On 21/10/2011 6:39 AM, knut-o wrote: > Hello > Is it possible to map a plot with horizontal lines like in the step-plot, > but without the vertical lines? Not in the basic plot function, but you can write your own fairly easily, using segments(). For example: x <- y <- 1:10 plot(x,y, type='n') segments(x[-10], y[-10], x[-1], y[-10]) Duncan Murdoch