On 3/18/2007 8:56 AM, Chabot Denis wrote: > Thank you Marc, Jim and Gabor, > > I like the solution with "expression", nice and simple. Gabor, your > solution did not work, probably just a matter of putting the text > inside an expression? > > However it would be nice if the help system pointed to it. A search > on "italics" brought me nothing, one on "italic" gave me 4 hits, none > useful. And reading the help on plotmath, I found no mention of italic > (). Where can we suggest additions to the help system?
The R-devel list is the best place to make suggestions like that if you're talking about documentation in base packages. Please submit patches to the source from https://svn.r-project.org/R/trunk Package documentation is in src/library/*/man/*.Rd, the manuals are in doc/manual/*.texi. There are also bits and pieces of other documentation (FAQs, etc.) elsewhere. Suggestions about contributed packages (including Recommended ones) should be sent to the package maintainer and/or author. Duncan Murdoch > > I must plead guilty to have forgotten a RSiteSearch before posting. I > just did and I think I might have figured out something out there. > But your answers were nice and to the point! > > Cheers, > > Denis > Le 07-03-17 à 23:30, Marc Schwartz a écrit : > >> On Sat, 2007-03-17 at 21:56 -0500, Marc Schwartz wrote: >>> On Sat, 2007-03-17 at 22:01 -0400, Chabot Denis wrote: >>>> Hi, >>>> >>>> As part of the legend to a plot, I need to have the "n" in italics >>>> because it is a requirement of the journal I aim to publish in: >>>> "This study, n = 3293" >>>> >>>> Presently I have: >>>> legend(20, 105, "This study, n = 3293", pch=1, col=rgb(0,0,0,0.5), >>>> pt.cex=0.3, cex=0.8, bty="n") >>>> >>>> I suppose I could leave a blank in place of the "n", then issue a >>>> text call where I'd use font=3 for a single letter, "n". But it will >>>> be tricky to find the exact location to use. >>>> >>>> Is there a way to switch to font=3 just for one letter within a >>>> string? >>>> >>>> Thanks in advance, >>>> >>>> Denis Chabot >>> Denis, >>> >>> Try something like this: >>> >>> plot(20, 100) >>> >>> leg <- legend(20, 105, "This study, = 3293", pch = 1, >>> col=rgb(0,0,0,0.5), pt.cex = 0.3, cex = 0.8, >>> bty = "n") >>> >>> text(leg$text$x + strwidth("This study, ", cex = 0.8), >>> leg$text$y, "n", font = 3, cex = 0.8, adj = c(0, 0.5)) >>> >>> >>> Note that legend returns a list structure, which contains the x and y >>> coordinates of the start of the text strings that are plotted. So >>> I get >>> that information for your line of text. >>> >>> Next, I use strwidth() to calculate, in user coordinates, the >>> length of >>> the characters preceding the 'n', including spaces. We add that >>> distance to the x coordinate returned in the legend call. >>> >>> I also use the 'adj' argument in the text() call, so that it is in >>> synch >>> with the same parameters in legend() for alignment with the other >>> letters. >>> >>> See ?strwidth for more information. >>> >>> You may have to tweak the horizontal spacing of the 'n' a bit, >>> depending >>> upon the rest of your graph. >> Denis, >> >> I thought of another approach, using plotmath. >> >> First, create a text expression, specifying that the 'n' should be >> italicized. Then use that expression in the legend() call. >> >> txt <- expression(paste("This study, ", italic(n), " = 3293")) >> >> plot(20, 100) >> >> legend(20, 105, txt, pch = 1, col=rgb(0,0,0,0.5), >> pt.cex = 0.3, cex = 0.8, bty = "n") >> >> >> That's easier that the first solution. See ?plotmath >> >> HTH, >> >> Marc Schwartz >> >> > > ______________________________________________ > 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 > and provide commented, minimal, self-contained, reproducible code. ______________________________________________ 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 and provide commented, minimal, self-contained, reproducible code.