[R] Axis positions

[Jim Lemon]

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