Erf (Apache Commons Numbers Gamma 1.2 API)

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

```
public final class Erf
extends Object
```
Error function.
\[ \operatorname{erf}(z) = \frac{2}{\sqrt\pi}\int_0^z e^{-t^2}\,dt \]

- Method Summary
  
  All Methods Static Methods Concrete Methods
  Modifier and Type Method Description
  
  static double value(double x)
  Returns the error 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)
```
    Returns the error function.
    The returned value is always between -1 and 1 (inclusive). The appropriate extreme is returned when erf(x) is indistinguishable from either -1 or 1 at double precision.
    Special cases:
    
    If the argument is 0, then the result is 0.
    If the argument is > 6, then the result is 1.
    If the argument is < 6, then the result is -1.
    If the argument is nan, then the result is nan.
    Parameters:
    
    x - the value.
    
    Returns:
    
    the error function.