JSci.maths
Class ExtraMath

java.lang.Object
  JSci.maths.AbstractMath
      JSci.maths.ExtraMath

public final class ExtraMath
extends AbstractMath

The extra math library. Provides extra functions not in java.lang.Math class. This class cannot be subclassed or instantiated because all methods are static.

Version:

1.1

Author:

Mark Hale

Method Summary

static double	acosh(double x) Returns the arc hyperbolic cosine of a double, in the range of 0.0 through .
static double	asinh(double x) Returns the arc hyperbolic sine of a double, in the range of - through .
static double	atanh(double x) Returns the arc hyperbolic tangent of a double, in the range of - through .
static double	binomial(double n, double k) Returns the binomial coefficient (n k).
static int	binomial(int n, int k) Returns the binomial coefficient (n k).
static double	cosh(double x) Returns the hyperbolic cosine of a double.
static double	factorial(double x) Returns the factorial.
static double	hypot(double x, double y) Returns sqrt(x2+y2).
static double	logFactorial(double x) Returns the natural logarithm of the factorial.
static int	pow(int a, int b) Returns ab.
static double	sinh(double x) Returns the hyperbolic sine of a double.
static double	tanh(double x) Returns the hyperbolic tangent of a double.

Methods inherited from class java.lang.Object

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

Method Detail

hypot

public static double hypot(double x,
                           double y)

Returns sqrt(x²+y²).

pow

public static int pow(int a,
                      int b)

Returns a^b.

factorial

public static double factorial(double x)

Returns the factorial. (Wrapper for the gamma function).

Parameters:

x - a double.

See Also:

SpecialMath.gamma(double)

logFactorial

public static double logFactorial(double x)

Returns the natural logarithm of the factorial. (Wrapper for the log gamma function).

Parameters:

x - a double.

See Also:

SpecialMath.logGamma(double)

binomial

public static int binomial(int n,
                           int k)

Returns the binomial coefficient (n k). Uses Pascal's recursion formula.

Parameters:

n - an integer.

k - an integer.

binomial

public static double binomial(double n,
                              double k)

Returns the binomial coefficient (n k). Uses gamma functions.

Parameters:

n - a double.

k - a double.

sinh

public static double sinh(double x)

Returns the hyperbolic sine of a double.

Parameters:

x - a double.

cosh

public static double cosh(double x)

Returns the hyperbolic cosine of a double.

Parameters:

x - a double.

tanh

public static double tanh(double x)

Returns the hyperbolic tangent of a double.

Parameters:

x - a double.

asinh

public static double asinh(double x)

Returns the arc hyperbolic sine of a double, in the range of - through .

Parameters:

x - a double.

acosh

public static double acosh(double x)

Returns the arc hyperbolic cosine of a double, in the range of 0.0 through .

Parameters:

x - a double.

atanh

public static double atanh(double x)

Returns the arc hyperbolic tangent of a double, in the range of - through .

Parameters:

x - a double.