gammaln

Natural logarithm of the gamma function, ln(|Γ(x)|).

Syntax

v = gammaln(x)

Description

Returns log(abs(gamma(x))). Useful when computing factorials of large numbers — gamma(x) overflows for x > ~171, but gammaln(x) remains finite.

Example

gammaln(100)           % ≈ 359.13

See also

• gamma — Gamma function Γ(x).