Class Erfcx

java.lang.Object

org.apache.commons.numbers.gamma.Erfcx

public final class Erfcx
extends Object

Scaled complementary error function.

\[ \operatorname{erfcx}(z) = \operatorname{erfc}(z)\ e^{z^2} \]

For large z the value is approximately:

\[ \operatorname{erfcx}(z) = \frac{1}{z \sqrt{\pi}} \]

Since:

1.1

See Also:

• Erfc

Method Summary

Modifier and Type	Method	Description
static double	value(double x)	Returns the scaled complementary error function.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

value

public static double value(double x)

Returns the scaled complementary error function.

Special cases:

• If the argument is 0, then the result is 1.
• If the argument is +infinity, then the result is 0.
• If the argument is negative and exp(x*x) is infinite, then the result is +infinity.
• If the argument is nan, then the result is nan.

Parameters:

x - Value.

Returns:

the scaled complementary error function.