Trigamma (Apache Commons Numbers Gamma 1.2 API)

java.lang.Object
- org.apache.commons.numbers.gamma.Trigamma

```
public final class Trigamma
extends Object
```
Trigamma function. It is the derivative of the digamma function: $ψ_{1} (x) = \frac{d^{2}}{d x^{2}} (\ln Γ (x))$ .

- Method Summary
  
  All Methods Static Methods Concrete Methods
  Modifier and Type Method Description
  
  static double value(double x)
  Computes the trigamma function.
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - value
```
public static double value(double x)
```
    Computes the trigamma function.
    
    Parameters:
    
    x - Argument.
    
    Returns:
    
    trigamma(x) to within 1e-8 relative or absolute error whichever is larger.