[R] mark axis

[Marc Schwartz]

On Fri, 2003-11-28 at 07:45, Nolwenn Le Meur wrote:
> Maybe a stupid question:
>     In a plot, which parameter(s) ables to visualize the axis  like in a
> coplot
>     where the axis is also visible in the plot background ?
>     Thanks
>     Nolwenn
> 


There are two approaches:

1. Use par("tck") in the axis() command to extend the tick marks through
the plot region. The values for 'tck' are 0 to 1, representing the
proportion of the plot region that the tick marks will extend in to. For
example:

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


2. Use grid(), which will do the same thing with a single function. This
is actually the way that coplot() does it. It has a default color of
'lightgray' to de-emphasize the grid. It uses a 'dotted' line by
default, so if you want a solid line like coplot(), change the 'lty'
argument.

See ?axis, ?par (for 'tck') and ?grid for more information.

HTH,

Marc Schwartz