On Wed, 12 Mar 2008, Nordlund, Dan (DSHS/RDA) wrote: >> -----Original Message----- >> From: [EMAIL PROTECTED] >> [mailto:[EMAIL PROTECTED] On Behalf Of Alberto Monteiro >> Sent: Wednesday, March 12, 2008 10:28 AM >> To: Tom La Bone; r-help@r-project.org >> Subject: Re: [R] Specifying relative position of text in a plot >> >> >> Tom La Bone asked: >>> >>> What is the simplest way to specify the location of text in a >>> scatter plot >>> (created using the plot function) in relative terms rather than >>> specific x-y coordinates? For example, rather than putting text at >>> (300,49) on a plot, how do I put it 1/10 of the way over from the y >>> axis and 1/2 of the way up from the x axis? Thanks. >>> >> See the help of par: >> ?par >> >> Namely: >> >> plot(rnorm(100), rnorm(100)) >> pu <- par()$usr >> x <- pu[1] * 0.5 + pu[2] * 0.5 >> y <- pu[3] * 0.1 + pu[4] * 0.9 >> text(x, y, "the quick brown fox jumps over a lazy dog") >> >> Alberto Monteiro > > This is a useful example of placing text, but I interpreted the request > as aking for the text to be placed at the left side of the graph (1/10 > of the x range) and centered vertically (with respect to the y scale). > So, then I would calculate x and y as > > x <- pu[1] * 0.9 + pu[2] * 0.1 > y <- pu[3] * 0.5 + pu[4] * 0.5
Yes, and there has been another wrong answer earlier. Note that my suggestion of plot(rnorm(100), rnorm(100)) op <- par(usr=c(0,1,0,1)) text(1/10, 1/2, "some text") par(op) is a lot less error-prone (and it also works with log scales). > Also, text() centers the supplied text at the x,y coordinates. So, if > Tom wants the text "begin" at that point, he will need to adjust the x > coordinate for the length of the string being printed. Better, use the adj= argument to text. -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 ______________________________________________ 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.
