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The pow() variant further improves accuracy (GH-102866)

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Raymond Hettinger 2023-03-21 00:02:14 -05:00 • committed by GitHub
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Doc/library/itertools.rst
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@ -876,7 +876,7 @@ which incur interpreter overhead.
n = len(coefficients)
if n == 0:
return x * 0 # coerce zero to the type of x
powers = accumulate(repeat(x, n - 1), operator.mul, initial=1)
powers = map(pow, repeat(x), range(n))
return math.sumprod(reversed(coefficients), powers)
def polynomial_from_roots(roots):