[R] Error bars on barplots

[Peter Dalgaard BSA]

Martin Maechler <maechler at stat.math.ethz.ch> writes:

> I've changed  barplot() to
> - accept a "plot = FALSE" argument (default remains TRUE)
> - in the above case ``beside = TRUE'' return 
>   a vector of locations for *each* bar 
>   (instead of midpoints of group of "beside-bar"s)
> 
> I wonder if we shouldn't even return a matrix of these locations
> with the same dimension as  the barplot matrix argument.
> This matrix result could still be addressed as a vector (as all
> matrices can), but additionally, one could also use  apply(<res>, 2, mean)
> to get the locations of the mids of each bar group.
> 
> Opinions?

Agree on the last count. I suspect, however, that you might want an
all.bars=FALSE argument to get the current behavior as default?

BTW, anyone considered the PR#130 strangeness of

 x<-c(a=1,b=2,c=3)
 barplot(x)

where you get a dash-dotted axis because of axis(..., lty=0)

-- 
   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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