Andreas Svensson wrote: > Hi > > The reason I use expression is to get italics. Perhaps this is possible > some other way?
1. Yes, see ?mtext: plot(1:10) mtext("Hello World", 3, font=3) 2. expression() has to use bounding boxes for several reasons, in particular fractions spring to mind at once. Solutions as Peter suggested: plot(1:10) mtext(expression("Hello World" * phantom("g")), 3) Uwe Ligges > /A > > Peter Dalgaard wrote: > >> Andreas Svensson <[EMAIL PROTECTED]> writes: >> >> >> >>> <> >>> >>> Hello >>> >>> One sometimes (quite often really ) marvel at the choice of defaults in >>> R's graphic engine. >>> For some obscure reason, mtext uses the typographical descender (bottom >>> of letters) to align text. That is: "gG" will end up slightly higher >>> that "GG". Depending on the font, "Q" might end up higher than "O". >>> >>> (for explanation of baseline & descender see: >>> http://www.paratype.com/help/term/terms.asp?code=88) >>> >>> >> <snip> >> >> >>> mtext(expression(italic("Normal 1")) ,1 , line=1, at=1) >>> >>> >> <snap> >> >> >>> As the word "Higher" includes a descending letter (g), this factor name >>> ends up higher. >>> I must say I have never encountered a software that uses the >>> typographical descender instead of the baseline to align text . >>> >>> Does anyone know how to make R use the baseline instead? Perhaps using >>> adj or padj? Or do I have to do something silly as adding >>> "g", col=white >>> to each mtext-line to trick R into aligning the names. >>> >>> >> Notice that it only happens when plotting math expressions. Using >> >> mtext("Normal 1" ,1 , line=1, at=1,font=3) >> mtext("Higher 1 " ,1 , line=1, at=2, font=3) >> etc. >> >> does not exhibit the same effect. >> >> I suppose the idea is that math expressions can grow arbitrarily tall >> or deep, and that the design decision (wise or not) has been to align >> on the bounding box of the whole enchilada. For a workaround, if you >> do need to do it with expressions, notice the phantom() construction. >> >> >> > > ______________________________________________ > 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.