Jiantao Shi wrote:
> Hi,
> I have a data frame,
>
>
>>df=rnorm(1000)
>>dim(df)=c(100,10)
>>
>
> And i can get the boxplot,
>
>
>>boxplot(data.frame(df))
>
>
>
> So how can add a line (aline) on the existing boxplot,eg,
>
>
> Thanks in advance.
Example:
df <- rnorm(1000)
dim(df) <- c(100,10)
boxplot(data.frame(df))
aline <- apply(df, 2, max)
# , now you might want either
abline(h = aline, col = "green", lty="dotted")
# or
segments(seq(along = aline) - 0.2, aline,
seq(along = aline) + 0.2, aline,
lwd = 2, col = "red")
Uwe Ligges
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>
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