[R] How to add a line on the boxplot

[Uwe Ligges]

Jiantao Shi wrote:
> Thanks
> The first method,i get many lines,using the second,i get segments.I 
> actually
> need one line with y coordinate defined by aline,x along the boxplot.

Do you mean lines(aline)?
If not, please explain in another way how you want to arrange those 10 
values and make lines from it.

Uwe Ligges



> 
> On 7/22/06, Uwe Ligges <ligges at statistik.uni-dortmund.de> wrote:
>>
>> 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
>>
>>
>>
>>
>> >       [[alternative HTML version deleted]]
>> >
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>>
>>
>