[R] ggplot2 - expand range?

[hadley wickham]

Hi Pedro,

You need to set the expand parameter to c(0,0) :

scale_y_continuous(limits=c(0,10), expand = c(0,0))

ggplot uses expand_range internally to ensure that you always have
some space between the data and the margins (and you should make sure
this happens in your plot too - otherwise it can be hard to see data
points on the sides)

Hadley

On 11/1/07, Pedro de Barros <pbarros at ualg.pt> wrote:
> Dear UserRs,
>
> I am trying to use systematically ggplot2 for most of my plots, but I
> am fighting some lack of documentation, which I try to overcome.
>
> I want to build a scatterplot where the axes cross exactly at (0,0).
> I tried using scale_y_continuous(limits=c(0,10)), but I always get an
> extra space at the bottom of the axes. The code I used is below.
>
>   > plotdata<-data.frame(x=1:10, y=runif(10))
>   > plot<-ggplot()
>   > plot<-plot+layer(data=plotdata, mapping=aes_string(x='x',y='y'),
> geom='point', stat='identity', size=4)
>   > plot<-plot+ scale_y_continuous(limits=c(0,1))
>   > print(plot)
>
> I believe there may be a way to use expand_range to fix this (I think
> I read about it somewhere), but I do not seem to find out how.
> I have searched the ggplot help and
> the archives, but cannot find the answer to this issue.
> I would really appreciate if anyone could give me a pointer.
>
> I am using R2.6.0 (patched) on Windows
>
> Thanks,
> Pedro
>
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