[R-sig-Geo] turning polygons shapefile into quadrats

[francesco]

Dear List,

I have been banging my head on a problem for three days now, so I believe the time has come to look for help.

I have a polygon shapefile with an irregular grid and I would like to turn the polygons in the shapefile into tiles to use with "quadratcount" method in spatstat package. 

I have been coercing back and forth with lists, slots, classes and I got a little lost into trying to turn the coordinates of the shapes into tiles.

The final objective is to extract statistics on points falling inside each polygons.  The points are a SpatialPointsDataframe class with attributes which will be analysed in each polygon as if the polygons were containers.

I hope I have explained clearly and that someone can point towards a method to use for this. 

PS  I am relatively new to R, but it's fantastic.

Cheers,
--------------------------------------
Francesco Pirotti
Dept. Te.S.A.F./CIRGEO
University of Padua
Viale dell'Università 16
I-35020 Legnaro (PD)
tel.       +39 049 827 2710
fax.      +39 049 827 2686
mob.    +39 349 55 39 261
@mail   francesco.pirotti at unipd.it  
skypeID francesco197576    
http://www.cirgeo.unipd.it/cirgeo/francescopirotti.htm