[R] add symbol above letter in R

Duncan Murdoch murdoch.duncan at gmail.com
Tue Dec 9 20:36:44 CET 2014

On 09/12/2014 2:28 PM, Zilefac Elvis via R-help wrote:
> Hi,
> I would like to add a dash (—) on a letter in R.
> How can I add a dash on letter P in the following:
> mtext(text=expression(Winter(DJF)~mean~daily~precipitation~italic(P)), side=3, line=1, cex=1.3, col="black")
> ?plotmath could not provide an answer to my problem.

But it refers to demo(plotmath), and that's where you could find the 
answer to your question:  use bar().  For example,

mtext(text=expression(Winter(DJF)~mean~daily~precipitation~bar(italic(P))), side=3, line=1, cex=1.3, col="black")

Duncan Murdoch

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