Difference between revisions of "Factorial"
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Revision as of 20:54, 10 July 2007
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
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