def item_type(self):
if self.is_countable:
return type(self.items[0])
else:
first, items = cytoolz.peek(self.items)
self.items = items
return type(first)
def vdl(signal, times, delay, initial_value=0.0):
"""Variable delay line which delays `signal` at 'times' with 'delay'.
:param signal: Signal to be delayed.
:type signal: Iterator
:param delay: Delay.
:type delay: Iterator
:param initial_value: Sample to yield before first actual sample is yielded due to initial delay.
.. note:: Times and delay should have the same unit, e.g. both in samples or both in seconds.
"""
dt0, delay = cytoolz.peek(delay)
times, _times = itertools.tee(times)
# Yield initial value before interpolation kicks in
# Note that this method, using tee, buffers all samples that will be discarded.
# Therefore, room for optimization!
n = 0
if initial_value is not None:
while next(_times) < dt0:
n += 1
yield initial_value
times1, times2 = itertools.tee(times)
interpolated = interpolate_linear(map(operator.add, times2, delay), signal, times1)
yield from cytoolz.drop(n, interpolated) # FIXME: move drop before interpolation, saves memory
def vdl(signal, times, delay, initial_value=0.0):
"""Variable delay line which delays `signal` at 'times' with 'delay'.
:param signal: Signal to be delayed.
:type signal: Iterator
:param delay: Delay.
:type delay: Iterator
:param initial_value: Sample to yield before first actual sample is yielded due to initial delay.
.. note:: Times and delay should have the same unit, e.g. both in samples or both in seconds.
"""
dt0, delay = cytoolz.peek(delay)
times, _times = itertools.tee(times)
# Yield initial value before interpolation kicks in
# Note that this method, using tee, buffers all samples that will be discarded.
# Therefore, room for optimization!
n = 0
if initial_value is not None:
while next(_times) < dt0:
n += 1
yield initial_value
times1, times2 = itertools.tee(times)
interpolated = interpolate_linear(map(operator.add, times2, delay), signal,
times1)
yield from cytoolz.drop(
n, interpolated) # FIXME: move drop before interpolation, saves memory
def peek(self):
"""Check the first item in the stream."""
first, self._iterator = cytoolz.peek(self._iterator)
return first
def peek(self):
"""Check the first item in the stream."""
first, self._iterator = cytoolz.peek(self._iterator)
return first
def peek(self):
first, seq = cytoolz.peek(self)
self = self.__class__(seq)
return first