java.lang
Class Math

java.lang.Object
  java.lang.Math

public final class Math
extends Object

Mathematical functions.

Author:

Brian Bagnall

Field Summary

static double	E
static double	NaN
static double	PI

Method Summary

static double	abs(double a) Returns the absolute value of a double value.
static int	abs(int a) Returns the absolute value of an integer value.
static double	acos(double a) Arc cosine function.
static double	asin(double a) Arc sine function.
static double	atan(double x) Arc tangent function.
static double	atan2(double y, double x) Arc tangent function valid to the four quadrants y and x can have any value without sigificant precision loss atan2(0,0) returns 0.
static double	ceil(double a) Returns the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer.
static double	cos(double x) Cosine function using a Chebyshev-Pade approximation.
static double	exp(double a) Exponential function.
static double	floor(double a) Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer.
static double	log(double x) Natural log function.
static double	max(double a, double b) Returns the greater of two double values.
static int	max(int a, int b) Returns the greater of two integer values.
static double	min(double a, double b) Returns the lesser of two double values.
static int	min(int a, int b) Returns the lesser of two integer values.
static double	pow(double a, double b) Power function.
static double	random() Random number generator.
static int	round(float a) Returns the closest int to the argument.
static double	sin(double x) Sine function using a Chebyshev-Pade approximation.
static double	sqrt(double x) Square root - thanks to Paulo Costa for donating the code.
static double	tan(double a) Tangent function.
static double	toDegrees(double angrad) Converts radians to degrees.
static double	toRadians(double angdeg) Converts degrees to radians.

Methods inherited from class java.lang.Object

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

Field Detail

E

public static final double E

See Also:

Constant Field Values

PI

public static final double PI

See Also:

Constant Field Values

NaN

public static final double NaN

See Also:

Constant Field Values

Method Detail

ceil

public static double ceil(double a)

Returns the smallest (closest to negative infinity) double value that is not less than the argument and is equal to a mathematical integer.

floor

public static double floor(double a)

Returns the largest (closest to positive infinity) double value that is not greater than the argument and is equal to a mathematical integer.

round

public static int round(float a)

Returns the closest int to the argument.

min

public static int min(int a,
                      int b)

Returns the lesser of two integer values.

min

public static double min(double a,
                         double b)

Returns the lesser of two double values.

max

public static int max(int a,
                      int b)

Returns the greater of two integer values.

max

public static double max(double a,
                         double b)

Returns the greater of two double values.

random

public static double random()

Random number generator. Returns a double greater than 0.0 and less than 1.0

exp

public static double exp(double a)

Exponential function. Returns E^x (where E is the base of natural logarithms). Thanks to David Edwards of England for conceiving the code and Martin E. Nielsen for modifying it to handle large arguments. = sum a^n/n!, i.e. 1 + x + x^2/2! + x^3/3!

Seems to work better for +ve numbers so force argument to be +ve.

log

public static double log(double x)

Natural log function. Returns log(a) to base E Replaced with an algorithm that does not use exponents and so works with large arguments.

See Also:

here

pow

public static double pow(double a,
                         double b)

Power function. This is a slow but accurate method. Thanks to David Edwards of England for conceiving the code.

abs

public static double abs(double a)

Returns the absolute value of a double value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned.

abs

public static int abs(int a)

Returns the absolute value of an integer value. If the argument is not negative, the argument is returned. If the argument is negative, the negation of the argument is returned.

sin

public static double sin(double x)

Sine function using a Chebyshev-Pade approximation. Thanks to Paulo Costa for donating the code.

cos

public static double cos(double x)

Cosine function using a Chebyshev-Pade approximation. Thanks to Paulo Costa for donating the code.

sqrt

public static double sqrt(double x)

Square root - thanks to Paulo Costa for donating the code.

tan

public static double tan(double a)

Tangent function.

atan

public static double atan(double x)

Arc tangent function. Thanks to Paulo Costa for donating the code.

atan2

public static double atan2(double y,
                           double x)

Arc tangent function valid to the four quadrants y and x can have any value without sigificant precision loss atan2(0,0) returns 0. Thanks to Paulo Costa for donating the code.

acos

public static double acos(double a)

Arc cosine function.

asin

public static double asin(double a)

Arc sine function.

toDegrees

public static double toDegrees(double angrad)

Converts radians to degrees.

toRadians

public static double toRadians(double angdeg)

Converts degrees to radians.