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Merge for issue #26114

This commit is contained in:
Brett Cannon 2016-01-15 09:39:06 -08:00
parent 4edc0e8407 45adb3100b
commit 2f1a0b6ad5
1 changed files with 2 additions and 3 deletions
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Modules/mathmodule.c
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@ -400,9 +400,8 @@ m_lgamma(double x)
Implementations of the error function erf(x) and the complementary error Implementations of the error function erf(x) and the complementary error
function erfc(x). function erfc(x).
Method: following 'Numerical Recipes' by Flannery, Press et. al. (2nd ed., Method: we use a series approximation for erf for small x, and a continued
Cambridge University Press), we use a series approximation for erf for fraction approximation for erfc(x) for larger x;
small x, and a continued fraction approximation for erfc(x) for larger x;
combined with the relations erf(-x) = -erf(x) and erfc(x) = 1.0 - erf(x), combined with the relations erf(-x) = -erf(x) and erfc(x) = 1.0 - erf(x),
this gives us erf(x) and erfc(x) for all x. this gives us erf(x) and erfc(x) for all x.