[GRASSLIST:4823] Generating centroids

[David Mahoney]

I seem to have missed something out of the grass57 tutorials. I have 
imported some an arc line coverage, converted it to boundaries, and 
built it as polygons. However, I can't figure out how to assign the 
attribute from the boundaries to the finished polygons. This should be 
possible, as the input vectors were doubled along common boundaries 
(not topological). What I don't want to have to do is to use v.extract 
to extract each category to a new map, assign the attributes to that 
map, then patch them all back together. Is there some way to 
automatically generate centroids?

David Mahoney