R help - Aug 2009 - ggplot2 and mtext question

Hi,

In R base graphics, the function mtext can be used to add text to the 
margins of a plot.  This is very useful for adding notes (such as data 
source, sample size, etc.) to the bottom of a graph.  How can such notes 
be added to the bottom of a graph when using ggplot2?

Thanks,

Walt



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Walter R. Paczkowski, Ph.D.
Data Analytics Corp.
44 Hamilton Lane
Plainsboro, NJ 08536
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(F) 609-936-3733
dataanalytics at earthlink.net
www.dataanalyticscorp.com

Data Analytics Corp. wrote:
> 
> Hi,
> 
> In R base graphics, the function mtext can be used to add text to the 
> margins of a plot.  This is very useful for adding notes (such as data 
> source, sample size, etc.) to the bottom of a graph.  How can such notes 
> be added to the bottom of a graph when using ggplot2?
> 
Can't think of an easy/elegant way.
One quick hack:
> d = data.frame(x=1:10,y=runif(10))
> ggplot(d,aes(x=x,y=y))+geom_point()+labs(x="abc\n\nnote:def")
 you might also have some luck with grid.text:

 grid.text("abc",x=unit(0.8,"npc"),y=unit(0.1,"npc"))


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