Python math.lgamma() Method

Example

Find the log gamma value of different numbers:

# Import math Library
import math

# Return the log gamma value of different numbers
print (math.lgamma(7))
print (math.lgamma(-4.2))

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Definition and Usage

The math.lgamma() method returns the natural logarithm gamma value of a number.

Tip: We can find also find the log gamma value by using the math.gamma() method to find the gamma value, and then use the math.log() method to calculate the log of that value.

Tip: The gamma value is equal to factorial(x-1).

Syntax

math.lgamma(x)

Parameter Values

Parameter	Description
x	Required. The number to find the log gamma value of. If the number is a negative integer, it returns a ValueError. If it is not a number, it returns a TypeError.

Technical Details

Return Value:	A `float` value, representing the log gamma value of a number
Python Version:	3.2

❮ Math Methods