[R] adding layers in ggplot2 (data and code included)

[hadley wickham]

Hi Juliet,

On Sun, Sep 21, 2008 at 11:47 PM, Juliet Hannah <juliet.hannah at gmail.com> wrote:
> Here is some sample data:
>
> mydata <- read.table(textConnection("Est Group    Tri
>       0        0 4.639644
>       1        0 4.579189
>       2        0 4.590714
>       0        1 4.443696
>       1        1 4.588243
>       2        1 4.650505
>       0        2 4.296608
>       1        2 4.826036
>       2        2 4.765386"),header=TRUE);
>  closeAllConnections();
>
> I can form two plots, scatter and  lines, as follows:
>
> p <- ggplot(mydata, aes(x=Est, y=Tri))
> p + geom_point(aes(colour=factor(Group),shape=factor(Group)))
>
> and
>
> p+ geom_smooth(aes(group=factor(Group),color=factor(Group)),method=lm,se=F).
>
> However, I am unable to have the plots together.
>
> I obtain the following error:
>
>> p + geom_point(aes(colour=factor(Group),shape=factor(Group)))+geom_smooth(aes(group=factor(Group),color=factor(Group)),method=lm,se=F)
> Error in `[.data.frame`(df, , var) : undefined columns selected

Are you using R 2.7.2?  Something in R changed between R 2.7.1 and R
2.7.2 that breaks certain ggplot plots (you code works fine for me
without modification).  It's on my to do list to fix.

You can also simplify your code a little by relying on defaults set in
the ggplot() call:

ggplot(mydata, aes(Est, Tri, colour = factor(Group))) +
 geom_point(aes(shape = factor(Group))) +
 geom_smooth(method = lm, se = F)

(Andpleaseusespacesotherwiseitsveryhardtoreadyourcode)

Hadley

>
> Thanks,
>
> Juliet
>
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