R devel - Sep 2003 - hist will not use parameter xaxs (PR#4219)

Full_Name: Mark Wall
Version: 1.6.0
OS: linux
Submission from: (NULL) (63.251.119.254)


I want to plot a histogram of a *subset* of some data:
>t = c(0:9)
>hist(t,right=FALSE,breaks=10,xlim=c(0,5),xaxs="i")
This means I should plot a histogram from 0 to 5 with breaks at 1,2,3,4.  This
should produce exactly 5 bars of frequency=1.  Instead I get 5 and 1/4 bars.  I
do not want the 4% margins on the x axis that xaxs="r" provides.

mwall@diversa.com wrote:
> Full_Name: Mark Wall
> Version: 1.6.0
Please don't submit bug reports for outdated versions of R.

> OS: linux
> Submission from: (NULL) (63.251.119.254)
> 
> 
> I want to plot a histogram of a *subset* of some data:
> 
> 
>>t = c(0:9)
>>hist(t,right=FALSE,breaks=10,xlim=c(0,5),xaxs="i")
 >
> 
> This means I should plot a histogram from 0 to 5 with breaks at 1,2,3,4. 
This
> should produce exactly 5 bars of frequency=1.  Instead I get 5 and 1/4
bars.  I
> do not want the 4% margins on the x axis that xaxs="r" provides.
What documentation tells us that hist() accepts an argument "xaxs"? I 
cannot find any. Hence it is *not* a bug. You can use par() to set 
parameters like this.


What you can do is:

  dat <- 0:9
  par(xaxs = "i")
  hist(dat, right = FALSE, xlim = c(0, 5), breaks = 10)

or subset your data itself:

  hist(t[t<5], right = FALSE, breaks=0:5)

Uwe Ligges

mwall@diversa.com wrote:
> Full_Name: Mark Wall
> Version: 1.6.0
> OS: linux
> Submission from: (NULL) (63.251.119.254)
> 
> 
> I want to plot a histogram of a *subset* of some data:
> 
> 
>>t = c(0:9)
>>hist(t,right=FALSE,breaks=10,xlim=c(0,5),xaxs="i")
> 
> 
> This means I should plot a histogram from 0 to 5 with breaks at 1,2,3,4. 
This
> should produce exactly 5 bars of frequency=1.  Instead I get 5 and 1/4
bars.  I
> do not want the 4% margins on the x axis that xaxs="r" provides.
This is still a problem.

xlim applies to the graph of the histogram, not the histogram itself.
You need to subset your before plotting.  Try:

hist(t[0<=t & t<=5],
right=FALSE,breaks=10,xlim=c(0,5),xaxs="i")


-- 
Ross Ihaka                         Email:  ihaka@stat.auckland.ac.nz
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