[R] Vertical Line on Plot
I was wondering what would be the best way to put a vertical line on a graph made with plot(). I can get an horizontal line by plotting a vector where every element has the same value but it is not as clear how a vertical line should be done. Thanks very much, Peter. __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Vertical Line on Plot
Peter Lauren wrote: I was wondering what would be the best way to put a vertical line on a graph made with plot(). I can get an horizontal line by plotting a vector where every element has the same value but it is not as clear how a vertical line should be done. abline(v=42) you can use it for horizontal lines too: abline(h=42) and several other things. See help(abline) for details. Barry __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Vertical Line on Plot
On Thu, 2006-05-25 at 09:26 -0700, Peter Lauren wrote: I was wondering what would be the best way to put a vertical line on a graph made with plot(). I can get an horizontal line by plotting a vector where every element has the same value but it is not as clear how a vertical line should be done. Thanks very much, Peter. Is this what you want? set.seed(12345) # reproducible random numbers datx - rnorm(100) # some example data daty - rnorm(100) plot(datx, daty) # plot it abline(v = mean(datx)) # add vertical line at mean of x abline(v = 0.5, col = red) # same but at x == 0.5 abline(h = mean(daty)) # horizontal lines abline(a = 0, b = 1) # lines of arbitrary intercept and slope see ?abline HTH G -- %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% * Note new Address, Telephone Fax numbers from 6th April 2006 * %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% Gavin Simpson ECRC ENSIS [t] +44 (0)20 7679 0522 UCL Department of Geography [f] +44 (0)20 7679 0565 Pearson Building [e] gavin.simpsonATNOSPAMucl.ac.uk Gower Street [w] http://www.ucl.ac.uk/~ucfagls/cv/ London, UK. [w] http://www.ucl.ac.uk/~ucfagls/ WC1E 6BT. %~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~%~% __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] Vertical Line on Plot
Barry Rowlingson wrote: Peter Lauren wrote: I was wondering what would be the best way to put a vertical line on a graph made with plot(). I can get an horizontal line by plotting a vector where every element has the same value but it is not as clear how a vertical line should be done. abline(v=42) you can use it for horizontal lines too: abline(h=42) and several other things. See help(abline) for details. Barry I don't wish to discourage new R users from asking questions in this forum, but this seems like a good time to remind new R users of the existence of some _very_ useful documentation: 1. As has just recently been mentioned again by Berton Gunter in his periodic reminder, there exists a nice, concise ref-card at http://www.rpad.org/Rpad/Rpad-refcard.pdf This would have led to abline() almost immediately (page 3). 2. 'An Introduction to R' is installed with R. Again, it would have quickly led to abline() (section 12.2). The help pages are great when you know what function you need. The above two documents (and others on CRAN) help one to discover what function might be needed. Peter Ehlers __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
