[R] display double dot over character in plotmath?

Ranjan Maitra maitra at email.com
Sat May 13 01:55:06 CEST 2017


Is it possible to display double dot (umlaut) over a character such as would be possible using \ddot x in LaTeX? I can do this using tikzDevice but I wanted something simpler to point to. 

Here is an example of what I would like to do, but it is not quite there:


ggplot(data, aes(x=X)) + geom_line(aes(y = Z), size=0.43) + xlab(expression(atop(top,bold(Age~"à"))))

I would like to put in a double dot over the "a" in the x-axis instead of "`".

Many thanks for any suggestions and best wishes,

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