[R-sig-Geo] spplot(), SpatialGridDataFrame

[Edzer J. Pebesma]

Ingo Holz wrote:
> Hi,
>
>  I have a SpatialGridDataFrame and want to plot it with spplot().
>
>  Is it possible to plot only the grids that have a special value (eg. 312)?
>   
fullgrid(x) = FALSE
spplot(x[x$value == 312,"value"]

Note that if fullgrid(x) is TRUE, x[rows,cols] would select on 
rows/cols, not on attribute values.
>  If it is not possible to do this with spplot() how would it be done with plot()?
>
>   
I'd use image rather than plot; plot would use symbols instead of 
coloured squares.
--
Edzer
> Thanks, Ingo
>
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