org.apache.commons.numbers.gamma

Class Erfc

java.lang.Object

org.apache.commons.numbers.gamma.Erfc

public final class Erfc
extends Object

Complementary error function.

Method Summary

Modifier and Type	Method and Description
static double	value(double x) This implementation computes erfc(x) using the regularized gamma function, following Erf, equation (3).

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)

This implementation computes erfc(x) using the regularized gamma function, following Erf, equation (3).

The value returned is always between 0 and 2 (inclusive). If abs(x) > 40, then erf(x) is indistinguishable from either 0 or 2 at double precision, so the appropriate extreme value is returned.

Parameters:

x - Value.

Returns:

the complementary error function.

Throws:

ArithmeticException - if the algorithm fails to converge.

See Also:

RegularizedGamma.Q.value(double, double, double, int)