[R] grid lines aligned on each ticks with a log scale

[Duncan Murdoch]

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
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>  
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