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Add "strict" to dotproduct(). Add docstring. Factor-out common code. (GH-100480)

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(cherry picked from commit f89de679ff)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
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Miss Islington (bot) 2022-12-23 16:00:21 -08:00 • committed by GitHub
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Doc/library/itertools.rst
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@ -795,7 +795,8 @@ which incur interpreter overhead.
return chain.from_iterable(repeat(tuple(iterable), n)) return chain.from_iterable(repeat(tuple(iterable), n))
def dotproduct(vec1, vec2): def dotproduct(vec1, vec2):
return sum(map(operator.mul, vec1, vec2)) "Compute a sum of products."
return sum(starmap(operator.mul, zip(vec1, vec2, strict=True)))
def convolve(signal, kernel): def convolve(signal, kernel):
# See: https://betterexplained.com/articles/intuitive-convolution/ # See: https://betterexplained.com/articles/intuitive-convolution/
@ -807,7 +808,7 @@ which incur interpreter overhead.
window = collections.deque([0], maxlen=n) * n window = collections.deque([0], maxlen=n) * n
for x in chain(signal, repeat(0, n-1)): for x in chain(signal, repeat(0, n-1)):
window.append(x) window.append(x)
yield sum(map(operator.mul, kernel, window)) yield dotproduct(kernel, window)
def polynomial_from_roots(roots): def polynomial_from_roots(roots):
"""Compute a polynomial's coefficients from its roots. """Compute a polynomial's coefficients from its roots.