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[3.11] Add "strict" to dotproduct(). Add docstring. Factor-out common code. (GH-100480) #100482

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miss-islington merged 1 commit into from
Dec 24, 2022
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[3.11] Add "strict" to dotproduct(). Add docstring. Factor-out common code. (GH-100480) #100482

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Add "strict" to dotproduct(). Add docstring. Factor-out common code. (G… 
…H-100480)

(cherry picked from commit f89de67)

Co-authored-by: Raymond Hettinger <rhettinger@users.noreply.github.com>
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@rhettinger @miss-islington
rhettinger authored and miss-islington committed Dec 23, 2022
commit 141c47997b19bdbb5638ca04212db3d81a94bb81
5 changes: 3 additions & 2 deletions Doc/library/itertools.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -795,7 +795,8 @@ which incur interpreter overhead.
return chain.from_iterable(repeat(tuple(iterable), n))

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):
# See: https://betterexplained.com/articles/intuitive-convolution/
Expand All @@ -807,7 +808,7 @@ which incur interpreter overhead.
window = collections.deque([0], maxlen=n) * n
for x in chain(signal, repeat(0, n-1)):
window.append(x)
yield sum(map(operator.mul, kernel, window))
yield dotproduct(kernel, window)

def polynomial_from_roots(roots):
"""Compute a polynomial's coefficients from its roots.
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