[GRASS-user] r.mask vs g.region

[Rich Shepard]

   I have DEMs covering a large area and want to limit analyses to a single
drainage basin. I can use 'g.region vect=basin_name' or 'r.mask
vect=basin_name' and want to learn of differences by applying one in
preference to tha other. Are there situations where one is preferred over
the other? Does computational time differ between the two?

TIA,

Rich