[R] add symbol above letter in R

Zilefac Elvis zilefacelvis at yahoo.com
Tue Dec 9 20:28:21 CET 2014


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.

many thanks for your solutions.


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