math
Class MathUtils

java.lang.Object
  math.MathUtils

public class MathUtils
extends java.lang.Object

Field Summary

static double	DEG_2_RAD Constant to convert degrees to radians.
static double	LOG2
static double	PI
static double	PI_ON_180
static double	PI_ON_2
static double	PI_ON_4
static double	RAD_2_DEG Constant to convert radians to degrees.

Constructor Summary

MathUtils()

Method Summary

static double	acosd(double a) Returns the inverse cosine of a value, in the range of 0.0 through 180.0 degrees.
static double	acosh(double a) Returns the inverse hyperbolic cosine of a value.
static double	asind(double a) Returns the inverse sine of a value, in the range of -90.0 through 90.0 degrees.
static double	asinh(double a) Returns the inverse hyperbolic sine of a value.
static int	atan(int y, int x)
static double	atan2d(double a, double b) Calculates the angle from the positive horizontal (x-)axis to a point (a,b), in the range of -180.0 through 180.0 degrees.
static double	atand(double a) Returns the inverse tangent of a value, in the range of -90.0 through 90.0 degrees.
static double	atanh(double a) Returns the inverse hyperbolic tangent of a value.
static short	clip(short i)
static boolean	closeEnough(double x, double y, double percentage)
static double	cos(double alpha)
static double	cosd(double a) Returns the cosine of an angle expressed in degrees.
static double	cosh(double a) Returns the hyperbolic cosine of an angle.
static double	factorial(int n)
static float	factorial(short n)
static int	fib(int n)
static int	gcd(int a, int b)
static double	getGauss(double x, double xc, double sigma)
static double[]	getGauss(int n)
static double	getLOG2()
static int	getLogBase2(double d)
static double	getLogBase2Double(double d)
static double	getRandom(double min, double max)
static int	getRandomNumber0_255()
static double	getTrapezoidal(double x, double a, double b, double c, double d)
static boolean	isOdd(int i)
static boolean	isPowerOfTwo(double l)
static int	isqrt(int x)
static short	isqrt(short x)
static double	log10(double a) Returns the logarithm to the base 10 of a number.
static double	log2(double l)
static int	log2(int l)
static double	logBase2(int length)
static double	logBase4(int length)
static void	main(java.lang.String[] args)
static double	max(int x, int y)
static boolean	nextTo(int x0, int y0, int x1, int y1)
static boolean	onLine(int x0, int y0, int x1, int y1, int x2, int y2)
static void	print(double[] d)
static int	roundToIntegralPowerOf2(int n)
static int	sign(int x)
static double	sin(double alpha)
static double	sinc(double x) Returns the function sinc x, where sinc x is defined as sin x / x.
static double	sind(double a) Returns the sine of an angle expressed in degrees.
static double	sinh(double a) Returns the hyperbolic sine of an angle.
static float	sqrt(double f)
static float	sqrt(float f)
static double	tand(double a) Returns the tangent of an angle expressed in degrees.
static double	tanh(double a) Returns the hyperbolic tangent of an angle.
static void	testCloseEnough()
static void	testGauss()
static void	testLongIsqrt()
static void	writeOutRandomNumbersToAFile()

Methods inherited from class java.lang.Object

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

Field Detail

LOG2

public static final double LOG2

PI_ON_180

public static final double PI_ON_180

See Also:

Constant Field Values

PI

public static final double PI

See Also:

Constant Field Values

PI_ON_2

public static final double PI_ON_2

See Also:

Constant Field Values

PI_ON_4

public static final double PI_ON_4

See Also:

Constant Field Values

DEG_2_RAD

public static final double DEG_2_RAD

Constant to convert degrees to radians.

See Also:

Constant Field Values

RAD_2_DEG

public static final double RAD_2_DEG

Constant to convert radians to degrees.

See Also:

Constant Field Values

Constructor Detail

MathUtils

public MathUtils()

Method Detail

writeOutRandomNumbersToAFile

public static void writeOutRandomNumbersToAFile()

isOdd

public static boolean isOdd(int i)

getLogBase2

public static int getLogBase2(double d)

Parameters:

d - input argument to the log2 function

Returns:

base 2 log.

getLogBase2Double

public static double getLogBase2Double(double d)

getGauss

public static double getGauss(double x,
                              double xc,
                              double sigma)

getGauss

public static double[] getGauss(int n)

testGauss

public static void testGauss()

print

public static final void print(double[] d)

testLongIsqrt

public static void testLongIsqrt()

isqrt

public static short isqrt(short x)

isqrt

public static int isqrt(int x)

roundToIntegralPowerOf2

public static int roundToIntegralPowerOf2(int n)

getTrapezoidal

public static double getTrapezoidal(double x,
                                    double a,
                                    double b,
                                    double c,
                                    double d)

gcd

public static int gcd(int a,
                      int b)

log2

public static int log2(int l)

getLOG2

public static double getLOG2()

log2

public static double log2(double l)

isPowerOfTwo

public static boolean isPowerOfTwo(double l)

sign

public static int sign(int x)

cos

public static double cos(double alpha)

sin

public static double sin(double alpha)

atan

public static int atan(int y,
                       int x)

nextTo

public static boolean nextTo(int x0,
                             int y0,
                             int x1,
                             int y1)

onLine

public static boolean onLine(int x0,
                             int y0,
                             int x1,
                             int y1,
                             int x2,
                             int y2)

max

public static double max(int x,
                         int y)

sqrt

public static float sqrt(float f)

sqrt

public static float sqrt(double f)

logBase2

public static double logBase2(int length)

logBase4

public static double logBase4(int length)

fib

public static int fib(int n)

acosd

public static double acosd(double a)

Returns the inverse cosine of a value, in the range of 0.0 through 180.0 degrees. Valid input range is -1.0 <= a <= 1.0.

Parameters:

a - input value in the range -1.0 <= a <= 1.0.

Returns:

the angle in degrees.

acosh

public static double acosh(double a)

Returns the inverse hyperbolic cosine of a value. Valid input range is a >= 1.0.

Parameters:

a - input value in the range a >= 1.0.

Returns:

the inverse hyperbolic cosine

asind

public static double asind(double a)

Returns the inverse sine of a value, in the range of -90.0 through 90.0 degrees. Valid input range is -1.0 <= a <= 1.0.

Parameters:

a - input value in the range -1.0 <= a <= 1.0.

Returns:

the angle in degrees.

asinh

public static double asinh(double a)

Returns the inverse hyperbolic sine of a value.

Parameters:

a - input value

Returns:

the inverse hyperbolic sine

atand

public static double atand(double a)

Returns the inverse tangent of a value, in the range of -90.0 through 90.0 degrees. Valid input range is -Inf < a < Inf.

Parameters:

a - input value

Returns:

the angle in degrees.

atanh

public static double atanh(double a)

Returns the inverse hyperbolic tangent of a value.

Parameters:

a - input value

Returns:

the inverse hyperbolic tangent

atan2d

public static double atan2d(double a,
                            double b)

Calculates the angle from the positive horizontal (x-)axis to a point (a,b), in the range of -180.0 through 180.0 degrees.

Parameters:

a - x-input value

a - y-input value

Returns:

the angle in degrees.

cosd

public static double cosd(double a)

Returns the cosine of an angle expressed in degrees.

Parameters:

a - an angle, in degrees.

Returns:

the cosine of the argument.

cosh

public static double cosh(double a)

Returns the hyperbolic cosine of an angle.

Parameters:

a - an angle, in radians.

Returns:

the hyperbolic cosine of the argument.

log10

public static double log10(double a)

Returns the logarithm to the base 10 of a number.

Parameters:

a - a double value

Returns:

the logarithm to the base 10 of the argument.

sinc

public static double sinc(double x)

Returns the function sinc x, where sinc x is defined as sin x / x.

Parameters:

x - input value.

Returns:

the sinc of the argument.

sind

public static double sind(double a)

Returns the sine of an angle expressed in degrees.

Parameters:

a - an angle, in degrees.

Returns:

the sine of the argument.

sinh

public static double sinh(double a)

Returns the hyperbolic sine of an angle.

Parameters:

a - an angle, in radians.

Returns:

the hyperbolic sine of the argument.

tand

public static double tand(double a)

Returns the tangent of an angle expressed in degrees.

Parameters:

a - an angle, in degrees.

Returns:

the tangent of the argument.

tanh

public static double tanh(double a)

Returns the hyperbolic tangent of an angle.

Parameters:

a - an angle, in radians.

Returns:

the hyperbolic tangent of the argument.

getRandomNumber0_255

public static int getRandomNumber0_255()

Returns:

a random integer from 0..255

getRandom

public static double getRandom(double min,
                               double max)

Parameters:

min - range

max - range

Returns:

a random number from min to max

clip

public static short clip(short i)

closeEnough

public static boolean closeEnough(double x,
                                  double y,
                                  double percentage)

testCloseEnough

public static void testCloseEnough()

factorial

public static double factorial(int n)

factorial

public static float factorial(short n)

main

public static void main(java.lang.String[] args)