def prime(self):
"""
Return a PCSet that represents the given object in prime form, taking
into account its canonical TTO's (set these with .canon(T, I, M)).
"""
from sator.pcset import PCSet
n, m = self.prime_operation
return PCSet(self.copy(utils.transpose_multiply(self.pitches, n, m)))
def _transpose_multiply(self, sub_n=0, sub_m=0):
if not sub_m:
sub_m = self._default_m
result = [pc % self._mod for pc in \
utils.transpose_multiply(self.pcs, sub_n, sub_m)]
return self.copy(result)
def transpose_multiply(a, n, m=5):
if a.__class__ == PSet:
raise InvalidTTO("Pitch sets can not be operated on with TnMm")
return a.copy(utils.transpose_multiply(a.pcs, n, m))
