R help - Jul 2006 - How to add a line on the boxplot

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,
aline=apply(df,2,max)

Thanks in advance.

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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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