CombinatoricsUtils.FactorialLog (Hipparchus 1.4 API)

java.lang.Object
- org.hipparchus.util.CombinatoricsUtils.FactorialLog

Enclosing class:

CombinatoricsUtils
```
public static final class CombinatoricsUtils.FactorialLog
extends Object
```
Class for computing the natural logarithm of the factorial of n. It allows to allocate a cache of precomputed values. In case of cache miss, computation is preformed by a call to Gamma.logGamma(double).

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`static CombinatoricsUtils.FactorialLog`	`create()`	Creates an instance with no precomputed values.
`double`	`value(int n)`	Computes `log(n!)`.
`CombinatoricsUtils.FactorialLog`	`withCache(int cacheSize)`	Creates an instance with the specified cache size.

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

- Method Detail
  - create
```
public static CombinatoricsUtils.FactorialLog create()
```
    Creates an instance with no precomputed values.
    
    Returns:
    
    instance with no precomputed values
  - withCache
```
public CombinatoricsUtils.FactorialLog withCache(int cacheSize)
```
    Creates an instance with the specified cache size.
    
    Parameters:
    
    cacheSize - Number of precomputed values of the function.
    
    Returns:
    
    a new instance where cacheSize values have been precomputed.
    
    Throws:
    
    MathIllegalArgumentException - if n < 0.
  - value
```
public double value(int n)
```
    Computes log(n!).
    
    Parameters:
    
    n - Argument.
    
    Returns:
    
    log(n!).
    
    Throws:
    
    MathIllegalArgumentException - if n < 0.