[R] display double dot over character in plotmath?

Duncan Mackay dulcalma at bigpond.com
Sun May 14 15:57:50 CEST 2017


I just had to do something similar in windows with \"{u}. Try Unicode symbol
- see ?plotmath 

ggplot(data, aes(x=X)) + geom_line(aes(y = Z), size=0.43) +



Duncan Mackay
Department of Agronomy and Soil Science
University of New England
Armidale NSW 2351
Email: home: mackay at northnet.com.au

-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ranjan
Sent: Saturday, 13 May 2017 22:48
To: r-help at stat.math.ethz.ch
Subject: Re: [R] display double dot over character in plotmath?

On Fri, 12 May 2017 23:39:14 -0700 Daniel Nordlund <djnordlund at gmail.com>

> On 5/12/17 4:55 PM, Ranjan Maitra wrote:
> > Hi,
> > 
> > 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
> > 
> > require(ggplot2)
> > data<-as.data.frame(c("a","b","c","a","b","c"))
> > colnames(data)<-"Y"
> > data$X<-c(1:6)
> > data$Z<-c(1,2,3,1,2,3)
> > 
> > ggplot(data, aes(x=X)) + geom_line(aes(y = Z), size=0.43) +
> > 
> > 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,
> > Ranjan
> > 
> You haven't told what OS you are using, but with Windows OS, you can get 
> the 'ä' by making sure the NUMLOCK key is on, hold down the alt key and 
> press 0228 on the numeric keypad.

I am sorry, I use a linux operating system. I use Fedora 25 but the student
I wanted to show this uses Ubuntu, though I don't know if the distribution

Thanks again for your help, and best wishes,

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