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Small speed-up for the convolve() recipe. (GH-106371)

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Raymond Hettinger 2023-07-03 15:38:38 -05:00 • committed by GitHub
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Doc/library/itertools.rst
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@ -1085,8 +1085,8 @@ The following recipes have a more mathematical flavor:
kernel = tuple(kernel)[::-1] kernel = tuple(kernel)[::-1]
n = len(kernel) n = len(kernel)
padded_signal = chain(repeat(0, n-1), signal, repeat(0, n-1)) padded_signal = chain(repeat(0, n-1), signal, repeat(0, n-1))
for window in sliding_window(padded_signal, n): windowed_signal = sliding_window(padded_signal, n)
yield math.sumprod(kernel, window) return map(math.sumprod, repeat(kernel), windowed_signal)
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.