Package ffx.numerics.special

Class Erf

java.lang.Object

ffx.numerics.special.Erf

public class Erf
extends Object

Static methods to evaluate erf(x) and erfc(x) for a real argument x. Rational functions are used that approximate erf(x) and erfc(x) to machine precision (approximately 15 decimal digits).

Adapted from an original program written by W. J. Cody, Mathematics and Computer Science Division, Argonne National Laboratory, Argonne, IL 60439

Since:

1.0

Author:

Michael J. Schnieders

Method Summary

Modifier and Type	Method	Description
static double	erf(double arg)	Evaluates erf(x) for a real argument x.
static double	erfc(double arg)	Evaluate erfc(x) for a real argument x.

Methods inherited from class java.lang.Object

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

Method Details

erf

public static double erf(double arg)

Evaluates erf(x) for a real argument x.

Parameters:

arg - the value to evaluate erf at.

Returns:

erf of the argument.

Since:

1.0

erfc

public static double erfc(double arg)

Evaluate erfc(x) for a real argument x.

Parameters:

arg - the value to evaluate erfc at.

Returns:

erfc of the argument.

Since:

1.0