def __init__(self,ringstr="",ring=None):
'''Ring constructor.
'''
if ring == None:
sr = StringReader( ringstr );
tok = GenPolynomialTokenizer(sr);
self.pset = tok.nextPolynomialSet();
self.ring = self.pset.ring;
else:
self.ring = ring;
self.engine = GCDFactory.getProxy(self.ring.coFac);
def __init__(self,ringstr="",truncate=None,ring=None,cofac=None,name="z"):
'''Ring constructor.
'''
if ring == None:
if len(ringstr) > 0:
sr = StringReader( ringstr );
tok = GenPolynomialTokenizer(sr);
pset = tok.nextPolynomialSet();
ring = pset.ring;
vname = ring.vars;
name = vname[0];
cofac = ring.coFac;
if isinstance(cofac,RingElem):
cofac = cofac.elem;
if truncate == None:
self.ring = UnivPowerSeriesRing(cofac,name);
else:
self.ring = UnivPowerSeriesRing(cofac,truncate,name);
else:
self.ring = ring;
