diff options
Diffstat (limited to 'Modules/mathmodule.c')
| -rw-r--r-- | Modules/mathmodule.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/Modules/mathmodule.c b/Modules/mathmodule.c index 9359eb2..a6cd15a 100644 --- a/Modules/mathmodule.c +++ b/Modules/mathmodule.c @@ -400,9 +400,8 @@ m_lgamma(double x) Implementations of the error function erf(x) and the complementary error function erfc(x). - Method: following 'Numerical Recipes' by Flannery, Press et. al. (2nd ed., - Cambridge University Press), we use a series approximation for erf for - small x, and a continued fraction approximation for erfc(x) for larger x; + Method: we use a series approximation for erf for 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), this gives us erf(x) and erfc(x) for all x. |