Hi

Would a basic call to grid.text() do what you want here?

Paul


Paul Emberson wrote:
Hi Baptiste,

I think on this occasion I'll edit manually in inkscape with the textext
plugin which is a somewhat clumsy but simple option.  Thanks for the
link to the wiki which I wasn't aware of until now.

Paul

baptiste auguie wrote:
If you're desperate for a workaround, you might want to try this
example using pgfSweave,

http://ggplot2.wik.is/Mathematical_annotations

On a similar vein, you could try psfrag replacements with a postscript
device (there is some code for this on the list archives).

Feel free to comment / edit on the wiki page.

HTH,

baptiste

On 16 May 2009, at 14:48, Paul Emberson wrote:

Hi Stephen,

The problem is that the label on the graph doesn't get rendered with a
superscript.  I want the label on the graph to be rendered the same way
as the label you have put on the axis.

I am plotting a piecewise function and I wanted to label each section
of it.

Paul

stephen sefick wrote:
how about this

a <- 1:10
b <- 1:10
d <- paste("x","^","{n-1}")
qplot(a,b, xlab=expression(x^{n-1}))+geom_text(aes(4,8, label=d))

On Fri, May 15, 2009 at 10:02 PM, Paul Emberson
<em...@calidasoft.co.uk> wrote:

Hi,

Is there a way of annotating a ggplot plot with mathematical formulae?

I can do

geom_text(aes(label="some text", ...

but I can't do

geom_text(aes(label=expression(x^{n-1}), ...

It gives the error

Error: geom_text requires the following missing aesthetics: label

Is there a convenient equivalent?

Cheers,

Paul

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_____________________________

Baptiste AuguiƩ

School of Physics
University of Exeter
Stocker Road,
Exeter, Devon,
EX4 4QL, UK

Phone: +44 1392 264187

http://newton.ex.ac.uk/research/emag
______________________________


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--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
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64 9 3737599 x85392
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