copy pymc traces from a db instance to a new db.

copy_traces.py

def copy_traces(db1, dbname, dbclass, traceclass, **kwargs):
	"""Copy traces from a db to a new db. 
	"""
	db = dbclass(dbname=dbname, dbmode='w', **kwargs)
	db._initialize({}, 1)
	db.trace_names = db1.trace_names
	db.chains = 1
	# Create the Traces.
	for name, trace in db1._traces.iteritems():
		db._traces[name] = traceclass(name=name, value={0:trace[:]}, db=db)
		setattr(db, name, db._traces[name])
		# Load the state.
		db._state_ = db1.getstate()
	db._finalize()