[GRASS-user] Calculation with attributes of point file

[Johannes Radinger]

Hallo,

I've got a point file and populated (v.what.rast) it with values from a flow direction raster (flow direction from r.watershed). 

I want to use these values to rotate the symbol in ps.map but therefore I've to recalulcate the values in the direction-column of the point file (x*45+90 or so).

How can that be done? I thought about v.reclass but don't really know how?!

Another option would be to access the sqlite database and perform the calculation there (I am working in a python script) like:
database = sqlite3.connect(os.path.join(gisdbase, location, mapset, 'sqlite.db'))
db = database.cursor()
db.execute .... but what is the correct command for calculation within a database??

Probably it is easier than I think... :)

/j
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