[R-sig-Geo] Kriging on "srtm" data

[epifanio]

         hi i've some problem to do a tutorial on the kriging  
interpolation
         i found instruction on how to interpolate the srtm data to  
increase the resolution :

	http://grass.itc.it/newsletter/GRASS_OSGeo_News_vol4.pdf

	at page 20 ...  at the line :

        grd <- GridTopology(cellcentre.offset=c(G\$west+(G\$ewres/2),
        G\$south+(G\$nsres/2)),cellsize=c(G\$ewres, G\ 
$nsres),cells.dim=c(G\$cols, G\$rows));


       i have a sintax error in grid function.

i'm missing or wrong something?

thanks for any suggestion :-)

Massimo.