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gh-111933: fix broken link to A.Neumaier article #111937

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Merged
rhettinger merged 6 commits into from
Nov 12, 2023
Merged

gh-111933: fix broken link to A.Neumaier article #111937

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f2a7a57
gh-111933: fix broken link to A.Neumaier article
skirpichev Nov 10, 2023
652be90
Update Python/bltinmodule.c
skirpichev Nov 11, 2023
ed85ed9
Minor reformatting & replace archive.org with a link to prof Neumaier…
skirpichev Nov 11, 2023
1e97bc4
Merge branch 'main' into fix-sum-link
rhettinger Nov 11, 2023
09ebdf7
Switch to wikipedia link.
rhettinger Nov 11, 2023
34ccf26
Merge branch 'main' into fix-sum-link
rhettinger Nov 11, 2023
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Minor reformatting & replace archive.org with a link to prof Neumaier… 
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@skirpichev
skirpichev committed Nov 11, 2023
commit ed85ed99bf696dd0cdbb15d86dcf114eeffd1788
7 changes: 4 additions & 3 deletions Python/bltinmodule.c
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Expand Up @@ -2611,9 +2611,10 @@ builtin_sum_impl(PyObject *module, PyObject *iterable, PyObject *start)
}
if (PyFloat_CheckExact(item)) {
// Improved Kahan–Babuška algorithm by Arnold Neumaier
// Neumaier, A. (1974), Rundungsfehleranalyse einiger Verfahren zur Summation endlicher Summen.
// Z. angew. Math. Mech., 54: 39-51. https://doi.org/10.1002/zamm.19740540106
// https://web.archive.org/web/20220804051351/https://www.mat.univie.ac.at/~neum/scan/01.pdf
// Neumaier, A. (1974), Rundungsfehleranalyse einiger Verfahren
// zur Summation endlicher Summen. Z. angew. Math. Mech.,
// 54: 39-51. https://doi.org/10.1002/zamm.19740540106
// Scanned text: https://arnold-neumaier.at/scan/01.pdf
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double x = PyFloat_AS_DOUBLE(item);
double t = f_result + x;
if (fabs(f_result) >= fabs(x)) {
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