Double-Double Arithmetic and Special Function Implements

Pure Python functions

Polygamma function.

Inverse incomplete gamma function.

Calculate a scaled Lanczos sum for the approximation of the gamma function.

Create an iterator which evaluates the natural logarithm of the beta function.

Trigamma function.

Incomplete beta function and its first derivative.

Inverse incomplete beta function.

Compute the rising factorial.

Compute gamma(x+1) - 1.

Compute the ratio of two gamma functions.

Create an iterator which evaluates the Riemann zeta function for each iterated value.

real-valued gamma function in quad-precision using classic Fortran77

Create an iterator which evaluates Binet's formula for each iterated value.

Incomplete beta function.

Gamma function.

Natural logarithm of the beta function.

Inverse incomplete beta function.

Calculate the Lanczos sum for the approximation of the gamma function.