R help - May 2009 - ggplot2: annotating plot with mathematical formulae

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

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 <email at
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
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Stephen Sefick

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								-K. Mullis