plot nothing but only vline?

[Zhenjiang Lan]

Dear all,

my question is,

I have a dataset contained only two col: one is "x" and the other is "group".

I want to plot only vertical line with "x", and facet by "group".

How can I do this?

thanks a lot!

ZL

[Winston Chang]

Hi - it would help us help you if you include a reproducible example -- at the very least, a data set. See this page: http://gist.github.com/270442

ZL

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[Zhenjiang Lan]

Thank you!

I think here's an example:

mydf<-data.frame(pos=sample(100,size=12),grp=rep(1:3,each=4))

now I want to plot all 'pos' as vertical-line into different facet (by 'grp').

How can I do this using ggplot2?

[Dennis Murphy]

Hi:

Here's one way, setting ylim().

mydf<-data.frame(pos=sample(100,size=12),grp=rep(1:3,each=4))
ggplot(mydf) + geom_vline(aes(xintercept = pos)) + facet_wrap(~ grp) +
ylim(0, 1)

In 0.8.9 this yields a 2 x 2 arrangement of facets; in 0.9.0, it
yields a 1 x 3 arrangement.

HTH,
Dennis