Class LogBinomialCoefficient
- java.lang.Object
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- org.apache.commons.numbers.combinatorics.LogBinomialCoefficient
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public final class LogBinomialCoefficient extends Object
Natural logarithm of the binomial coefficient. It is "n choose k
", the number ofk
-element subsets that can be selected from ann
-element set.
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static double
value(int n, int k)
Computes the logarithm of the binomial coefficient.
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Method Detail
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value
public static double value(int n, int k)
Computes the logarithm of the binomial coefficient.This returns a finite result for any valid
n choose k
.- Parameters:
n
- Size of the set.k
- Size of the subsets to be counted.- Returns:
log(n choose k)
.- Throws:
IllegalArgumentException
- ifn < 0
,k < 0
ork > n
.
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