# Function lgamma Logarithm of the gamma function for real, positive numbers and complex numbers, using Lanczos approximation for numbers and Stirling series for complex numbers. ## Syntax ```js math.lgamma(n) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `n` | number | Complex | A real or complex number ### Returns Type | Description ---- | ----------- number | Complex | The log gamma of `n` ### Throws Type | Description ---- | ----------- ## Examples ```js math.lgamma(5) // returns 3.178053830347945 math.lgamma(0) // returns Infinity math.lgamma(-0.5) // returns NaN math.lgamma(math.i) // returns -0.6509231993018536 - 1.8724366472624294i ``` ## See also [gamma](gamma.md)