On 25-Jun-09 18:38:37, Marc Schwartz wrote: > On Jun 25, 2009, at 1:30 PM, Lesandro wrote: >> Hello all, >> How to draw a line in plot when I know the start point(x1,y1) >> and end point(x2,y2)? I need make this as additional information >> in the graph: >> >> plot(wl2[[1]],wl2[[2]]) >> >> I think that is possible make this with the function abline(), is >> possible? I looked the function lines() too, but don't understand >> as make. >> >> Thanks! >> Lesandro > > See ?segments which does just what you are looking for. > > lines() is more designed for a series of connected lines (eg. a > polygon) rather than a single line segment. > > abline() can draw a straight line, at a given vertical or horizontal > position, or if given a linear model object, the fitted line. > HTH, > Marc Schwartz
Hmm ... for this particular purpose I don't see what is wrong with plot(wl2[[1]],wl2[[2]]) lines(c(x1,x2),c(y1,y2)) along with any additional paramaters to lines() for line-type, colour, etc. -- I do this all the time ... Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <ted.hard...@manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 25-Jun-09 Time: 19:51:20 ------------------------------ XFMail ------------------------------ ______________________________________________ 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.