[R] geom_hline

[ONKELINX, Thierry]

Felipe,
 
You'll need to define the limits yourself with scale_y_continuous.
 
library(ggplot2)
p <- ggplot(mtcars, aes(x = wt, y=mpg)) + geom_point()
p + geom_hline(intercept=0) + scale_y_continuous(limits = c(0, max(mtcars$mpg)))

Cheers,
 
Thierry

________________________________

Van: r-help-bounces op r-project.org namens Jim Lemon
Verzonden: di 25-12-2007 10:16
Aan: Felipe Carrillo
CC: r-help op stat.math.ethz.ch
Onderwerp: Re: [R] geom_hline



Felipe Carrillo wrote:
>  Hi all:
> I am trying to draw a horizontal line along the zero
> "Y axis" value but since zero isn't showing therefore
> the line is not drawn. If I set my intercept to 15
> then it'll work but I dont want to hardcode it because
> the Y axis parameters could be different for another
> variable. I would like to alway set my hline along the
> zero as default. Thanks
>
> p <- ggplot(mtcars, aes(x = wt, y=mpg)) + geom_point()
> p + geom_hline(intercept=0)
>
Hi Felipe,
It sounds like you want to include zero in the axis. In base graphics,
you would use:

ylim=c(0,maxy)

where maxy specifies the upper end of the ordinate. I had a quick look
at the ggplot2 docs, but I haven't yet found whether this works in that
system.

Jim

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