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

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