hits=-2.6 tests=BAYES_00 X-USF-Spam-Flag: NO See ?grid though read the Note section of that page, which says that more fine tuning can be achieved through the use of abline directly.
Also, note that abline is vectorized so you don't need the loop. Here is you example, adjusted to avoid the large spaces at x and y > 9.5 and which uses a single call to abline: a <- runif(100)*10 b <- runif(100)*10 plot(a,b, pch=20, xlim=c(0, round(max(a))), ylim=c(0, round(max(b))), type = "n") ## add 1 here to put in an extra grid line at 10 vs <- seq(0, max(a) + 1, 0.5) hs <- seq(0, max(b) + 1, 0.5) abline(v=vs, h=hs, col="lightgrey") points(a, b, pch=20) HTH G On Fri, 2008-01-25 at 14:14 +0100, John Lande wrote: > dear all, > > I have a very simple question but I could not figure out. > > I need to make plots with grid in the background. > > something like I old retrive like this > > a=runif(100)*10 > b=runif(100)*10 > plot(a,b, pch=20, xlim=c(0, round(max(a))), ylim=c(0, round(max(b)))) > vs=seq(0, max(a), 0.5) > for(i in 1:length(vs)){ > abline(v=vs[i], col="lightgrey") > } > hs=seq(0, max(b), 0.5) > for(i in 1:length(hs)){ > abline(h=hs[i], col="lightgrey") > } > points(a, b, pch=20) > > as you can see it is not very convenient > > -- > john > > [[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. -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Dr. Gavin Simpson [t] +44 (0)20 7679 0522 ECRC, UCL Geography, [f] +44 (0)20 7679 0565 Pearson Building, [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street, London [w] http://www.ucl.ac.uk/~ucfagls/ UK. WC1E 6BT. [w] http://www.freshwaters.org.uk %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% ______________________________________________ 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.