public class Factorial
extends java.lang.Object
Modifier and Type | Field and Description |
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protected static double[] |
doubleFactorials |
protected static long[] |
longFactorials |
Constructor and Description |
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Factorial() |
Modifier and Type | Method and Description |
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static double |
factorial(int n)
Compute factorial of an integer.
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static double |
logFactorial(int n)
Computes the natural log of n factorial.
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protected static final long[] longFactorials
protected static final double[] doubleFactorials
public static double factorial(int n)
n
- Number for which to compute factorial.public static double logFactorial(int n)
n
- The number for which the log factorial is desired.We use the LogGamma function to compute log(n!) using the relation:
log(n!) = logGamma( n + 1 )