It is easier with:

legend('topleft', expression(paste("This study, ", italic(n) == 3295)))



On 3/17/07, Marc Schwartz <marc_schwartz@comcast.net> 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.
>
> HTH,
>
> Marc Schwartz
>
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>



-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

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