Point pattern add covariates

Dear list,
I have point pattern data and would like to attach/add covariates as raster
(image or grid) to it. For example as the case of the bei data with
bei.extra with covariates.

You want to get the values of a raster at a set of points?

 Try extract(points,raster) from the raster package. [or it might be
extract(raster,points)].

 'points' is a SpatialPoints object (or SPDataFrame) and 'raster' is a
raster or stack object from the raster package.

Barry