Re: [R] Overlaying lattice graphs

From: hadley wickham <h.wickham_at_gmail.com>
Date: Tue, 12 Jun 2007 22:51:21 +0200

On 6/12/07, Seb <pomchip_at_free.fr> wrote:
> Hello
>
> I apologize in advance if this question has already be posted on the
> list, although I could not find a relevant thread in the archives.
>
> I would like to overlay xyplots using different datasets for each plot.
> I typically work on the following data.frame (mydata) structure
>
> >mydata
> Drug Time Observed Predicted
> 1 A 0.05 10 10.2
> 2 A 0.10 20 19.5
> etc...
> 100 B 0.05 11 12.7
> 101 B 0.10 35 36
> etc...
>
> I want to plot the observed data as points and the predicted values as
> lines. If I use the following commands, I don't have the possibility to
> switch the "y" values from Observed for the scatterplot to Predicted for
> the line.
>
> xyplot(Observed ~ Time | Drug, data = mydata, panel = function(x,y, ...){
> + panel.xyplot(x,y,...)
> + panel.xyplot(x,y,type="l",...)})
>
> I wonder if this problem can be solved using the trellis.focus "family"
> commands but I have a hard time to understand how they work.

Another approach would be to use ggplot, http://had.co.nz/ggplot2. Then your code might look something like:

ggplot(mydata, aes(x=Time)) +
geom_point(aes(y=Observed)) +
geom_line(aes(y = Predicted)) +
facet_grid(. ~ Drug)

Hadley



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