LogBinomialCoefficient

java.lang.Object
- org.apache.commons.numbers.combinatorics.LogBinomialCoefficient

```
public final class LogBinomialCoefficient
extends java.lang.Object
```
Natural logarithm of the binomial coefficient. It is "n choose k", the number of k-element subsets that can be selected from an n-element set.

Field Summary

Fields
Modifier and Type	Field	Description
`private static int`	`LIMIT_M_DOUBLE`	The maximum m that can be computed without overflow of a double for any n.
`private static int`	`LIMIT_N_DOUBLE`	The maximum n that can be computed without overflow of a double for an m.
`private static int`	`LIMIT_N_LONG`	The maximum n that can be computed without overflow of a long for any m.

Constructor Summary

Constructors
Modifier Constructor Description

private LogBinomialCoefficient()
Private constructor.

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.
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - LIMIT_N_LONG
```
private static final int LIMIT_N_LONG
```
    The maximum n that can be computed without overflow of a long for any m. C(66, 33) < 2^63.
    
    See Also:
    
    Constant Field Values
  - LIMIT_N_DOUBLE
```
private static final int LIMIT_N_DOUBLE
```
    The maximum n that can be computed without overflow of a double for an m. C(1029, 514) ~ 1.43e308.
    
    See Also:
    
    Constant Field Values
  - LIMIT_M_DOUBLE
```
private static final int LIMIT_M_DOUBLE
```
    The maximum m that can be computed without overflow of a double for any n. C(2147483647, 37) ~ 1.39e302.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - LogBinomialCoefficient
```
private LogBinomialCoefficient()
```
    Private constructor.
- Method Detail
  - 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:
    
    java.lang.IllegalArgumentException - if n < 0, k < 0 or k > n.