def shift(self, shift_idx):
"""--------------------------------------------------------------------
Shifts the distribution by the given number of samples
-----------------------------------------------------------------------
shift_idx : The number of samples that the distribution is to be
shifted
--------------------------------------------------------------------"""
# Shift only if the index is non-zero and the distribution is in
# cent units
if shift_idx and self.has_cent_bin():
# update reference frequency
self.ref_freq = Converter.cent_to_hz(
self.bins[shift_idx] - self.bins[0],
ref_freq=self.ref_freq)
# If distribution is a PCD, we do a circular shift
if self.is_pcd():
self.vals = np.concatenate((self.vals[shift_idx:],
self.vals[:shift_idx]))
else: # If distribution is a PD, shift the bins.
self.bins -= self.step_size * shift_idx
def cent_to_hz(self):
if self.has_cent_bin():
self.bins = Converter.cent_to_hz(self.bins, self.ref_freq)
self.ref_freq = None
else:
raise ValueError('The bin unit should be "cent".')
