[R] how to change the position of xlab in truehist?

[Hua Li]

Thanks, Peter. It works!

Hua

--- On Fri, 4/16/10, Peter Ehlers <ehlers at ucalgary.ca> wrote:

> From: Peter Ehlers <ehlers at ucalgary.ca>
> Subject: Re: [R] how to change the position of xlab in truehist?
> To: "Hua Li" <hualihua at yahoo.com>
> Cc: r-help at r-project.org
> Date: Friday, April 16, 2010, 6:23 PM
> On 2010-04-16 16:00, Hua Li wrote:
> > Hi,
> >
> > I'm wondering how can I change the position of xlab in
> truehist. For example, the following code creats a histogram
> with 4 bins for my discrete data. I want each bin to be
> labelled as 0, 1, 2, or 3 in the middle, so that it's clear
> each bin corresponds to each of the discrete case.
> >
> > I was thinking of first delete xlab and then add marks
> myself, but it doesn't look like it's working. The old label
> can not be removed by setting xlab="" or xlab = NULL.
> >
> > Thanks for your help!
> >
> > Hua
> >
> > #------------------------
> > x = c(rep(0,10),rep(1,100),rep(2,50), rep(3,30))
> > library(MASS)
> > truehist(x,nbins=4)
> >
> > truehist(x,nbins=4,xlab="")
> 
> I think you misunderstand 'xlab'; it's the label for the
> x-axis,
> i.e. the 'x' that is produced by your first truehist()
> call.
> You want to change the value labels on the axis. You're on
> the
> right track by leaving that off and then adding your
> preferred
> labels at your preferred locations:
> 
>   truehist(x, nbins = 4, xaxt = "n")  ## see xaxt
> under ?par
>   axis(1, at = 0:3 + 0.5, labels = 0:3)
> 
> I usually add
> 
>   box(bty = "l")
> 
> -- 
> Peter Ehlers
> University of Calgary
>