[GRASS-user] How to list all unique pixel values (of a raster) covered by polygons (areas) for each polygon separately(?)

[nikos.alexandris at felis.uni-freiburg.de]

I tried to make it clear in the title... but I am not sure
that it's easy to understand.

Using v.rast.stats I get uni-variate statistics from a
raster (in my case a MODIS image with 250m pixel size)
based on polygons I digitised manually (areas).

How can I get listed all unique pixel values enclosed in
each of the polygons I digitised (and for which the univ.
stats are calculated)?

Need them for further statistical analysis... 

There must be a way to do this instead of creating unique
raster(s) for each polygon and using r.stats... !