R help - Mar 2010 - grid lines aligned on each ticks with a log scale

Hi all,
 
for publication purpose I must provide a graph with grid lines aligned with
each tick mark.
Thing is that the graph has a log scale on the x-axis.
I looked at the grid() and par() documentation but still don't figure out
how to get it done.
 
 
simple example
 
plot(seq(1,9), log="x", panel.first=grid())
 
how to get lines at x = 2 and 5 on the graph?
Of course the option "nx" in grid() is not valid, as it does not align
the
grid lines with the ticks in a log scale...
 
Thanks for giving a hand.

Regards/Cordialement

-------------
Benoit Boulinguiez
Ph.D student
Ecole de Chimie de Rennes (ENSCR) Bureau 1.20 
Equipe CIP UMR CNRS 6226 "Sciences Chimiques de Rennes"
Avenue du Général Leclerc 
CS 50837 
35708 Rennes CEDEX 7 
Tel 33 (0)2 23 23 80 83
Fax 33 (0)2 23 23 81 20
 <http://www.ensc-rennes.fr/> http://www.ensc-rennes.fr/ 

 

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On 20/03/2010 6:38 AM, Benoit Boulinguiez wrote:
> Hi all,
>  
> for publication purpose I must provide a graph with grid lines aligned with
> each tick mark.
> Thing is that the graph has a log scale on the x-axis.
> I looked at the grid() and par() documentation but still don't figure
out
> how to get it done.
>  
>  
> simple example
>  
> plot(seq(1,9), log="x", panel.first=grid())
>  
> how to get lines at x = 2 and 5 on the graph?
Use abline instead of grid for fine tuning:

plot(seq(1,9), log="x", panel.first=abline(v=c(1,2,5),h=c(2,4,6,8), 
lty=3,col="gray"))

Duncan Murdoch
> Of course the option "nx" in grid() is not valid, as it does not
align the
> grid lines with the ticks in a log scale...
>  
> Thanks for giving a hand.
> 
> Regards/Cordialement
> 
> -------------
> Benoit Boulinguiez
> Ph.D student
> Ecole de Chimie de Rennes (ENSCR) Bureau 1.20 
> Equipe CIP UMR CNRS 6226 "Sciences Chimiques de Rennes"
> Avenue du G?n?ral Leclerc 
> CS 50837 
> 35708 Rennes CEDEX 7 
> Tel 33 (0)2 23 23 80 83
> Fax 33 (0)2 23 23 81 20
>  <http://www.ensc-rennes.fr/> http://www.ensc-rennes.fr/ 
> 
>  
> 
> 	[[alternative HTML version deleted]]
> 
> 
> 
> ------------------------------------------------------------------------
> 
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