[R] Boxplot has only one whisker

[tom]

Hello!

I am using box plot and one of my boxes has only one whisker. How can I
change this?

Code:
bp<-c(2.7, 3.1, 3.5, 8.95)

Methode1 <- quantile(bp,type = 7)
Methode2 <- quantile(bp,type = 2)
d<-data.frame(Methode1,Methode2)
boxplot(d,ylab = "Beispiel 1",range = 1.5)
http://r.789695.n4.nabble.com/file/n2993262/boxplot_with_one_whisker.png 

Thanks!
Tom
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