R help - Mar 2006 - How to show the intermediate tick marks without the values in a different color

Is there a way to show also the intermediate tick marks without the
values?

Example:

plot(cars)

What would one do to show the tick marks in, say, gray color at the
increment of 1 without showing the actual values in-between the default
x
values: 5, 10, 15, 20, 25?

platform i386-pc-mingw32
arch     i386
os       mingw32
system   i386, mingw32
status
major    2
minor    2.1
year     2005
month    12
day      20
svn rev  36812
language R

Thanks,

On Thu, 2006-03-02 at 20:06 -0600, xpRt.wannabe wrote:
> Is there a way to show also the intermediate tick marks without the
> values?
> 
> Example:
> 
> plot(cars)
> 
> What would one do to show the tick marks in, say, gray color at the
> increment of 1 without showing the actual values in-between the default
> x
> values: 5, 10, 15, 20, 25?
Try this:

 # Do the plot without the x axis
 plot(cars, xlim = c(0, 25), xaxt = "n")

 # Do the x axis in grey with tick marks at 0:25
 # without labels
 axis(1, at = 0:25, labels = NA, col = "grey")

 # Now do the default tick marks in black with labels
 axis(1)


See ?plot.default, ?par (for 'xaxt') and ?axis for more information.

HTH,

Marc Schwartz