R help - Feb 2003 - exact range of axes in plots

Hello.  I was wondering how one can find the exact values of the range of 
an axis within a plot.  In xlispstat it was (send plot :range 0).  Thanks much,

   Jason

Hope this helps.

Jerome
> plot(0:1,0:1)
> par()$usr
[1] -0.04  1.04 -0.04  1.04

On Monday 24 February 2003 11:06, Jason Bond wrote:
> Hello.  I was wondering how one can find the exact values of the range of
> an axis within a plot.  In xlispstat it was (send plot :range 0).  Thanks
> much,
>
>    Jason
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> http://www.stat.math.ethz.ch/mailman/listinfo/r-help

Jason Bond wrote:
> Hello.  I was wondering how one can find the exact values of the range 
> of an axis within a plot.  In xlispstat it was (send plot :range 0).  
> Thanks much,
After you have created the plot try par("usr").  This gives 4 values:
xmin, xmax, ymin, ymax.

 > plot(1:10, 1:10)
 > par("usr")
[1]  0.64 10.36  0.64 10.36


-- 
Ross Ihaka                         Email:  ihaka at stat.auckland.ac.nz
Department of Statistics           Phone:  (64-9) 373-7599 x 85054
University of Auckland             Fax:    (64-9) 373-7018
Private Bag 92019, Auckland
New Zealand

Hi,

----- Original Message -----
From: "Jason Bond" <jbond at arg.org>
To: <R-help at stat.math.ethz.ch>
Sent: Tuesday, February 25, 2003 8:06 AM
Subject: [R] exact range of axes in plots

> Hello.  I was wondering how one can find the exact values of the range of
> an axis within a plot.  In xlispstat it was (send plot :range 0).  Thanks
much,

Is xlim and ylim in the plot() what you want?  For example:
    > x <- rnorm(100)
    > plot(x)
    > plot(x, xlim = c(20, 80), ylim = c(-2, 2))
the second plot() will restrict the range of x-axis to be between 20 and 80,
y-axis between -2, 2.

Cheers,

Kevin

>-----Original Message-----
>From: r-help-admin at stat.math.ethz.ch 
>[mailto:r-help-admin at stat.math.ethz.ch] On Behalf Of Jason Bond
>Sent: Monday, February 24, 2003 1:06 PM
>To: R-help at stat.math.ethz.ch
>Subject: [R] exact range of axes in plots
>
>
>Hello.  I was wondering how one can find the exact values of 
>the range of 
>an axis within a plot.  In xlispstat it was (send plot :range 
>0).  Thanks much,
>
>   Jason

See ?par

Specifically par("usr"), which will give you the actual range of the x
and y axes.

par("xaxp") or par("yaxp") will also give you information on
the axis
tick marks.

Be aware that the above pars are altered when log scales are used, so
be sure to read the help file carefully in that situation.

If you want to SET the axis ranges explicitly, most of the plotting
functions take the arguments 'xlim' and 'ylim', which can be
used for
that purpose.

HTH,

Marc Schwartz

Dear Jason,

par("usr") will give you what you want.

John

At 11:06 AM 2/24/2003 -0800, Jason Bond wrote:
>Hello.  I was wondering how one can find the exact values of the range of 
>an axis within a plot.  In xlispstat it was (send plot :range 0).  Thanks
much,
>
>   Jason
>
>______________________________________________
>R-help at stat.math.ethz.ch mailing list
>http://www.stat.math.ethz.ch/mailman/listinfo/r-help
____________________________
John Fox
Department of Sociology
McMaster University
email: jfox at mcmaster.ca
web: http://www.socsci.mcmaster.ca/jfox