R help - Jan 2004 - length of tick marks in grid.xaxis and grid.yaxis

Dear all,

How can I control the length of tick marks in grid.xaxis and grid.yaxis 
(package grid) ?

Best regards,

Renaud

-- 
Dr Renaud Lancelot
v?t?rinaire ?pid?miologiste
Ambassade de France - SCAC
BP 834 Antannarivo 101
Madagascar

t?l. +261 (0)32 04 824 55 (cell)
      +261 (0)20 22 494 37 (home)

Renaud Lancelot wrote:
> Dear all,
>
> How can I control the length of tick marks in grid.xaxis and 
> grid.yaxis (package grid) ?
>
> Best regards,
>
> Renaud
>
in grid tick marks are always drawn with length unit(1,"char") So the 
possible way to change tick length is set gp parameter of viewport, 
where the axis is drawn, like this viewport(...,gp=gpar(fontsize=24)) 
for larger ticks ot fontsize=6 for smaller (although it will of course 
change the size of all text annotations on this viweport, so the special 
care should be taken to override default gp in all text annotations).