[R-sig-Geo] unionSpatialPolygons

[rajkumar at mail.riaex.com]

Hi,

I have a Raster and converted to Polygons  using pol<-rasterToPolygons(r2)
I have 1429 polygons and I would like to combine the attached polygon into
a bigger polygon. what should I do to create index to use
unionSpatialPolygons?

Thanks
Rajkumar