[R] ggplot2 barplot in decreasing frequency

[Ista Zahn]

Hi Morten
Just order the factor the way you want before plotting:

df$v2 <- factor(df$v2, levels=c("bb", "cc", "aa"))

p = ggplot(df)
p + aes(v2) + geom_bar()


Best,
Ista

On Wed, Oct 6, 2010 at 5:09 AM, Morten <Morten.Lindberg at siv.no> wrote:
>
> Hi all,
>
> I have a large data frame and would like to make a barplot of a categorical
> variable with the bars sorted in order of decreasing frequency.
>
> # Example:
> v1 = c(1.2, 1.4, 0.9, 1.0, 1.1, 1.0)
> v2 = c("aa", "cc", "bb", "bb", "cc", "bb")
> v3 = c(8, 10, 11, 9, 9, 10)
> df = data.frame(v1=v1, v2=v2, v3=v3)
>
> # How can I tell ggplot to sort the bars?
> # First bar = "bb" (3), second bar "cc" (2) and third bar "aa" (1)
>
> p = gplot(df)
> p + aes(v2) + geom_bar()
>
>
> Thank you,
>
> Morten
> --
> View this message in context: http://r.789695.n4.nabble.com/ggplot2-barplot-in-decreasing-frequency-tp2964511p2964511.html
> Sent from the R help mailing list archive at Nabble.com.
>
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>



-- 
Ista Zahn
Graduate student
University of Rochester
Department of Clinical and Social Psychology
http://yourpsyche.org