R help - Mar 1999 - Y-limits of barplots

Hello everybody,

I frequently have to produce barplots from variables the natural variation
of which is far away from zero. A typical range would be, say from -16 to
-28.

So, the following example should give an "honest" presentation:

x<-c(-20,-22,-21,-28)
barplot(x,beside=T,ylim=c(-18,-30))

But using anything else but "0" for the first element of ylim
leads to strange results, as the bars "ignore" the X-axis and keep on
extending to zero. (R 0.63.2, Linux 2.0.25)

Any idea how to avoid this behaviour (without doing a rewrite of
"barplot")?


        Uli Flenker
        Institut fuer Biochemie
        Deutsche Sporthochschule Koeln
        Carl-Diem-Weg 6

        50933 Koeln

        Tel.: D/0221/4982-493
                         -494

 



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"Uli Flenker; Raum 704" <uli at biochem.dshs-koeln.de> writes:
> I frequently have to produce barplots from variables the natural variation
> of which is far away from zero. A typical range would be, say from -16 to
> -28.
> 
> So, the following example should give an "honest" presentation:
> 
> x<-c(-20,-22,-21,-28)
> barplot(x,beside=T,ylim=c(-18,-30))
> 
> But using anything else but "0" for the first element of ylim
> leads to strange results, as the bars "ignore" the X-axis and
keep on
> extending to zero. (R 0.63.2, Linux 2.0.25)
> 
> Any idea how to avoid this behaviour (without doing a rewrite of
> "barplot")?
I suppose some would say you deserve what you get and that it doesn't
really make sense to describe such data with barplots...

However, if you insist, try something like:

x<-c(-20,-22,-21,-28)
names(x)<-c("eenie","meenie","miney","moe")
barplot(-x-18,beside=T,ylim=c(0,12),axes=F)
axis(2,at=seq(0,12,2),labels=seq(-18,-30,-2))


-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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