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.

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

Incomplete beta function.

Gamma function.

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

Create an iterator which evaluates the natural logarithm of 1-exp(-|x|) for each iterated value.

Round a double-precision floating-point number toward zero.

Round a single-precision floating-point number toward zero.

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

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

Compute gamma(x+1) - 1.

Compute the ratio of two gamma functions.

Create an iterator which evaluates the binary logarithm for each iterated value.

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