Clip with Poly

[lehmann at fh-nuertingen.de]

Dear all,
Is raster-clipping with a polygon like the Arc/Info command gridclip 
possible?
I know the way to zoom, and then r.mapcalc to a new map, but I 
need not a rectangle but a irregularly form for clipping.

Thanks 

Dieter Lehmann
Dieter Lehmann
State University of applied Sciences
Schelmenwasen 4-8
D-72622 Nuertingen, Germany
lehmann at fh-nuertingen.de
Phone: +49 (0) 7022 404 Ext. 192 or Ext. 152
Fax: +49 (0) 7022 404 Ext. 166