R help - Jul 2009 - curve from a formula with ggplot2

Hi all,
 
I'm smoothly transferring my lattice graphs to ggplot2 graphs, but I'm
stuck
on representing a curve from a formula.
I'm looking for the equivalent of curve() in ggplot2, Hadley Wickham
mentions geom_curve, but as far as I've seen in the help it doesn't
exist.
 
My need is to plot a regular scatter plot of experimental data (easy to do
actually) and then add the fitting model according to a specific formula
like
y = a*(b*x^n)/(1+b*x^p)
 
where a,b,n and p are known parameters.
 
I guess it's possible and easy to add this layer with ggplot, somehow I
didn't find the right function.
 
Any help would be warmly appreciated.

Regards/Cordialement

-------------
Benoit Boulinguiez
Ph.D student
Ecole de Chimie de Rennes (ENSCR) Bureau 1.20 
Equipe CIP UMR CNRS 6226 "Sciences Chimiques de Rennes"
Avenue du Général Leclerc 
CS 50837 
35708 Rennes CEDEX 7 
Tel 33 (0)2 23 23 80 83
Fax 33 (0)2 23 23 81 20
 <http://www.ensc-rennes.fr/> http://www.ensc-rennes.fr/ 

 

	[[alternative HTML version deleted]]

Hi Benoit,

Have a look at http://had.co.nz/ggplot2/stat_function.html.  Does that help?

Hadley

On Tue, Jul 7, 2009 at 11:15 AM, Benoit
Boulinguiez<benoit.boulinguiez at ensc-rennes.fr>
wrote:
> Hi all,
>
> I'm smoothly transferring my lattice graphs to ggplot2 graphs, but
I'm stuck
> on representing a curve from a formula.
> I'm looking for the equivalent of curve() in ggplot2, Hadley Wickham
> mentions geom_curve, but as far as I've seen in the help it doesn't
exist.
>
> My need is to plot a regular scatter plot of experimental data (easy to do
> actually) and then add the fitting model according to a specific formula
> like
> y = a*(b*x^n)/(1+b*x^p)
>
> where a,b,n and p are known parameters.
>
> I guess it's possible and easy to add this layer with ggplot, somehow I
> didn't find the right function.
>
> Any help would be warmly appreciated.
>
> Regards/Cordialement
>
> -------------
> Benoit Boulinguiez
> Ph.D student
> Ecole de Chimie de Rennes (ENSCR) Bureau 1.20
> Equipe CIP UMR CNRS 6226 "Sciences Chimiques de Rennes"
> Avenue du G?n?ral Leclerc
> CS 50837
> 35708 Rennes CEDEX 7
> Tel 33 (0)2 23 23 80 83
> Fax 33 (0)2 23 23 81 20
> ?<http://www.ensc-rennes.fr/> http://www.ensc-rennes.fr/
>
>
>
> ? ? ? ?[[alternative HTML version deleted]]
>
>
> ______________________________________________
> 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.
>
>


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