Factorial

Factorial(n)

Computes the factorial of a positive integer n. The factorial of a positive integer is defined as:

n! = Product(1..n)

The factorial function grows very rapidly, resulting in a numeric overflow when n>170. However, the log factorial can often be used in its place, which can be obtained using:

LGamma(n+1)

Library

Math

See Also

• GammaFn : The gamma function. n! = GammaFn(n+1)
• LGamma: The natural logarithm of the gamma function
• Combinations, Permutations