On Aug 20, 2013, at 2:28 PM, Nixon, John wrote:
> A minimal R source code file producing this is:
>
> data=c(1,2)
> pdf(file="error.pdf")
> barplot(data)
> legend(1.5,c(expression(italic("C.sativa"),italic("B.rapa"))),horiz=TRUE)
> dev.off()
>
> The problem is that the two italicised strings are not aligned in the pdf
> output, with the string on the left being lower than the string on the right
> by size of about two dots. Removing the calls to expression and italic
> produces correct alignment, but italic is required in the final figure.
>
It's being caused by the descender of the letter "p". There are no letters with
descenders in the first expression. `phantom` lets you add space and apparently
does so both horizonatly which I how I've used it before and vertically as this
demonstrates. Do this:
data=c(1,2)
pdf(file="error.pdf")
barplot(data)
legend(1.5,c(expression( phantom("p")*italic("C.sativa"),
italic("B.rapa"))),horiz=TRUE)
dev.off()
--
David Winsemius
Alameda, CA, USA
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