R help - May 2004 - How to define specific location of tick marks in plot()

Hi,

I wish to create a series of plots  with the same x-axis range and the same 
placement of tick marks.  In  addition I want to force the tick marks to be at 
specific locations.  For  example, if I wish to have an x-axis which goes from 
40 to 110, with tick marks  at 40, 50, 60, ... , How can I accomplish that?  
The various parameters I  have tried changing just seem to be suggestions for 
an internal  definition.

I'm sure this is easy, but I'm obviously missing something in  the 
docmentation.

Dan Nordlund

On Sat, 22 May 2004 DJNordlund at aol.com wrote:
> I wish to create a series of plots with the same x-axis range and the
> same placement of tick marks.  In addition I want to force the tick
> marks to be at specific locations.  For example, if I wish to have an
> x-axis which goes from 40 to 110, with tick marks at 40, 50, 60, ... ,
> How can I accomplish that?  The various parameters I have tried changing
> just seem to be suggestions for an internal definition.
> 
> I'm sure this is easy, but I'm obviously missing something in  the 
> docmentation.
par(xaxs="d") is what you want, but it is not currently implemented. 
So
for now use xaxt="n" and then call axis() with at=.

plot(20:120, 20:120, xaxt="n")
axis(1, at = seq(40, 110, 10))

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

Thanks to Prof. Ripley for the rapid response and solution.  The R  
developers and contributors to this list are very helpful and generous with 
their time
and advice.
Dan Nordlund  
In a message dated 5/22/2004 11:41:13 AM Pacific Daylight Time,  
ripley at stats.ox.ac.uk writes:
On Sat, 22 May 2004 DJNordlund at aol.com  wrote:
> I wish to create a series of plots with the same x-axis range  and the
> same placement of tick marks.  In addition I want to force  the tick
> marks to be at specific locations.  For example, if I wish  to have an
> x-axis which goes from 40 to 110, with tick marks at 40, 50,  60, ... ,
> How can I accomplish that?  The various parameters I have  tried changing
> just seem to be suggestions for an internal  definition.
> 
> I'm sure this is easy, but I'm obviously missing  something in  the
> docmentation.
par(xaxs="d") is what you  want, but it is not currently implemented. 
So
for now use xaxt="n" and  then call axis() with at=.

plot(20:120, 20:120, xaxt="n")
axis(1, at =  seq(40, 110, 10))

-- 
Brian D.  Ripley,                   ripley at stats.ox.ac.uk
Professor of Applied Statistics,   http://www.stats.ox.ac.uk/~ripley/
University of  Oxford,              Te:  +44 1865 272861 (self)
1 South Parks  Road,                      +44 1865 272866 (PA)
Oxford OX1 3TG,  UK                 Fax:  +44 1865 272595