[R] lattice background grid

[Wen Huang]

It works perfectly! Thanks!

On Apr 8, 2010, at 10:32 PM, David Winsemius wrote:

>
> On Apr 8, 2010, at 11:07 PM, Wen Huang wrote:
>
>> Hi,
>>
>> I wonder if anyone knows how to control color and darkness of the  
>> background grid generated by ' type = c("g", "p") ' in a lattice  
>> plot (e.g., in xyplot). The documentation does not seem to offer a  
>> way to change them.
>>
>
> I wonder.
>
> Here's what I see based on the documentation
> ?panel.grid
> # has col.line as one of 6 arguments ... so ...
> # with the example in ?xyplot ...
> # -------------
> EE <- equal.count(ethanol$E, number=9, overlap=1/4)
> ## Constructing panel functions on the fly; prepanel
> xyplot(NOx ~ C | EE, data = ethanol,
>       prepanel = function(x, y) prepanel.loess(x, y, span = 1),
>       xlab = "Compression Ratio", ylab = "NOx (micrograms/J)",
>       panel = function(x, y) {
>           panel.grid(h=-1, v= 2, col.line="red", lty=3)
>           panel.xyplot(x, y)
>           panel.loess(x,y, span=1)
>       },
>       aspect = "xy")
>
> Seems to alter "them", at least to the minimal extent of the offered  
> explanation.
>
> -- 
> David
> --
>
> David Winsemius, MD
> West Hartford, CT
>