Factorial

Factorial(n)

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

n! = Product(1..n)

and can also be obtained by means of GammaFn as

n! = GammaFn(n + 1)

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

• Product
• GammaFn : The gamma function
• LGamma: The natural logarithm of the gamma function
• Combinations
• Permutations