R help - Feb 2011 - Axis positions

Hi everyone.

I would like to modify the axis on my plot. 

First, I would like to make a plot without the box. so I use :

plot(x,y, axes = FALSE, type = 'l')

Then, I call :

axis(1, tck = -0.02)
axis(2, tck = -0.02)

to have X and Y axis appear. However, I would like them to join at the
origin instead of having a space between the 2 axis. I can't find the
parameter to modify to get this result.

Secondly, is it possible to center X and Y axis so the origin is right in
the center of the graph.

With regards,
Phil
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try using box(), e.g.,

plot(x, y, axes = FALSE, type = 'l')
axis(1, tck = -0.02)
axis(2, tck = -0.02)
box(bty = "l")


I hope it helps.

Best,
Dimitris


On 2/16/2011 10:45 AM, Filoche wrote:
>
> Hi everyone.
>
> I would like to modify the axis on my plot.
>
> First, I would like to make a plot without the box. so I use :
>
> plot(x,y, axes = FALSE, type = 'l')
>
> Then, I call :
>
> axis(1, tck = -0.02)
> axis(2, tck = -0.02)
>
> to have X and Y axis appear. However, I would like them to join at the
> origin instead of having a space between the 2 axis. I can't find the
> parameter to modify to get this result.
>
> Secondly, is it possible to center X and Y axis so the origin is right in
> the center of the graph.
>
> With regards,
> Phil
-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands
Tel: +31/(0)10/7043478
Fax: +31/(0)10/7043014
Web: http://www.erasmusmc.nl/biostatistiek/

On 02/16/2011 08:45 PM, Filoche wrote:
>
> Hi everyone.
>
> I would like to modify the axis on my plot.
>
> First, I would like to make a plot without the box. so I use :
>
> plot(x,y, axes = FALSE, type = 'l')
>
> Then, I call :
>
> axis(1, tck = -0.02)
> axis(2, tck = -0.02)
>
> to have X and Y axis appear. However, I would like them to join at the
> origin instead of having a space between the 2 axis. I can't find the
> parameter to modify to get this result.
>
> Secondly, is it possible to center X and Y axis so the origin is right in
> the center of the graph.
>
Hi Phil,
For number 1, look at fullaxis (plotrix). For number 2, use something like:

plot(...,xlim=c(-1,1),ylim=c(-1,1),...)

in other words, use plot limits with zero in the middle.

Jim