[R] Boxplot with full x-range

[kjetil@entelnet.bo]

On 2 Nov 2003 at 4:32, Maura Melis wrote:

?boxplot

look at the argument at=, where you can give the position for each of 
the boxes.

(with this data you could also be interested in 
?coplot)

Kjetil Halvorse

> Hi all,
> 
> I'm new to R, and have the following problem:
> 
> I wish to draw a boxplot of simple data in two columns.   The x-axis 
> (taken from first column) is grouped to intervals (using 'cut').
> These intervals serve as x-value to the boxplot, and the data from the 
> second column are the y-values.
> 
> The problem is that I want to give an impression of the trend of the data 
> in the x-range.  However, when an interval on the x-axis contains no 
> y-data, no box is drawn, and the plot becomes 'narrower' in the 
> x-direction, giving a wrong impression of the trend of the y-value.
> 
> What I want is that no box is drawn for emtpy interval, but some X-space 
> is kept open.  In other words, I want ALL interval to be drawn, including 
> the empty ones.
> 
> Example scenario:
> 
> data.dat:
> 0.1 5
> 0.15 4.5
> 0.3 2
> 0.31 2.2
> 0.5 1
> 0.55 1.1
> 0.56 1.15
> 0.7 0.5
> 0.9 0.1
> 
> 
> > mydata <- read.table("data.dat")
> > attach(mydata)
> > cats = cut( V1, breaks=(0:10)*.1)
> > symmary( cats )
> 
> (0,0.1] (0.1,0.2] (0.2,0.3] (0.3,0.4] (0.4,0.5] (0.5,0.6] (0.6,0.7] 
> (0.7,0.8]
>          1         1         1         1         1         2         
> 1         0
> (0.8,0.9]   (0.9,1]
>          1         0
> 
> ## notice two intervals with zero elements
> 
> >  boxplot( V2 ~ cats )  ## this draws the boxplot, and just ignores the 
> > empty intervals
> 
> Any help would be appreciated,
> 
> tnx
> 
> Piet
> 
> 
> (running R1.7.0 on SUSE linux 8.1, AMD Athlon)
> 
> 
> ---
> Piet van Remortel
> Belgium
> pvremortATvub.ac.be
> 
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