On Tue, Mar 25, 2008 at 9:49 AM, Pedro de Barros <[EMAIL PROTECTED]> wrote:
> Dear All,
>
> After having overcome the issue of legends (thanks, Thierry, once
> more), I am trying to use facetting, but here also I can not find how
> to do this. I do not want to use qplot, but rather the more flexible
> options. However, it seems I am doing still something pretty stupid,
> because I always get an error, even if it seems I am doing everything
> like the examples.
>
> My code is below.
> set.seed(123)
> plotdata2<-data.frame(x=rep((1:4),4), y=rep(0.1*(1:4),4),
> group=sample(factor(rep(1:4,rep(4,4)), labels=c('Class1', 'Class2',
> 'Class3', 'Class4'))))
> plotdata2 <- plotdata2[order(plotdata2[,'group']),]
> plot0<-ggplot()
> layer1<-layer(data=plotdata2,
> mapping=aes_string(x='x',y='y'),geom='point', stat='identity')
> scaleY<-scale_y_continuous()
> scaleX <- scale_x_continuous()
> Facets<-facet_grid(group ~ .)
> plot1<-plot0+layer1 +scaleY + scaleX + facet_grid(group~.)
>
> plot1
>
> I always get the error message:
> Error in check_formula(formula, varnames) :
> Formula contains variables not in list of known variables
>
> Thanks for any help you can provide.
Hi Pedro,
To do facetting, there needs to be a default dataset for the plot:
plot0<-ggplot(plotdata2)
I'd also suggest you use some of the defaults:
layer1 <- geom_point(aes(x=x, y=y))
plot0 + layer1 + facet_grid(group~.)
(scales will be automatically added)
or with qplot:
qplot(x, y, data=plotdata2, facets = group ~ .)
Hadley
--
http://had.co.nz/
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