JMath (JMSL Numerical Library)

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JMSL^TM Numerical Library 3.0

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com.imsl.math
Class JMath

java.lang.Object
  com.imsl.math.JMath

public final class JMath
extends Object

Pure Java implementation of the standard java.lang.Math class. This Java code is based on C code in the package fdlibm, which can be obtained from www.netlib.org.

Field Summary
`static double`	`E`
`static double`	`PI`

Method Summary
`static double`	`abs(double x)` Returns the absolute value of a `double`.
`static float`	`abs(float x)` Returns the absolute value of a `float`.
`static int`	`abs(int x)` Returns the absolute value of an `int`.
`static long`	`abs(long x)` Returns the absolute value of a `long`.
`static double`	`acos(double x)` Returns the inverse (arc) cosine of a `double`.
`static double`	`asin(double x)` Returns the inverse (arc) sine of a `double`.
`static double`	`atan(double x)` Returns the inverse (arc) tangent of a `double`.
`static double`	`atan2(double y, double x)` Returns the angle corresponding to a Cartesian point.
`static double`	`ceil(double x)` Returns the value of a `double` rounded toward positive infinity to an integral value.
`static double`	`cos(double x)` Returns the cosine of a `double`.
`static double`	`exp(double x)` Returns the exponential of a `double`.
`static double`	`floor(double x)` Returns the value of a `double` rounded toward negative infinity to an integral value.
`static double`	`IEEEremainder(double x, double p)` Returns the IEEE remainder from x divided by p.
`static double`	`log(double x)` Returns the natural logarithm of a `double`.
`static double`	`max(double x, double y)` Returns the larger of two `double`s.
`static float`	`max(float x, float y)` Returns the larger of two `float`s.
`static int`	`max(int x, int y)` Returns the larger of two `int`s.
`static long`	`max(long x, long y)` Returns the larger of two `longs`.
`static double`	`min(double x, double y)` Returns the smaller of two `double`s.
`static float`	`min(float x, float y)` Returns the smaller of two `float`s.
`static int`	`min(int x, int y)` Returns the smaller of two `int`s.
`static long`	`min(long x, long y)` Returns the smaller of two `long`s.
`static double`	`pow(double x, double y)` Returns x to the power y.
`static double`	`random()` Returns a random number from a uniform distribution.
`static double`	`rint(double x)` Returns the value of a `double` rounded toward the closest integral value.
`static long`	`round(double x)` Returns the `long` closest to a given `double`.
`static int`	`round(float x)` Returns the integer closest to a given `float`.
`static double`	`sin(double x)` Returns the sine of a `double`.
`static double`	`sqrt(double x)` Returns the square root of a `double`.
`static double`	`tan(double x)` Returns the tangent of a `double`.

Methods inherited from class java.lang.Object

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

Field Detail

PI

public static final double PI

E

public static final double E

Method Detail

abs

public static int abs(int x)

Returns the absolute value of an int.

Parameters:: x - an int
Returns:: an int representing .

abs

public static long abs(long x)

Returns the absolute value of a long.

Parameters:: x - a long
Returns:: a long representing .

abs

public static float abs(float x)

Returns the absolute value of a float.

Parameters:: x - a float
Returns:: a float representing .

abs

public static double abs(double x)

Returns the absolute value of a double.

Parameters:: x - a double
Returns:: a double representing .

min

public static int min(int x,
                      int y)

Returns the smaller of two ints.

Parameters:: x - an int; y - an int
Returns:: an int representing the smaller of x and y

min

public static long min(long x,
                       long y)

Returns the smaller of two longs.

Parameters:: x - a long; y - a long
Returns:: a long, the smaller of x and y

min

public static float min(float x,
                        float y)

Returns the smaller of two floats.

Parameters:: x - a float; y - a float
Returns:: a float, the smaller of x and y. This function considers -0.0f to be less than 0.0f.

min

public static double min(double x,
                         double y)

Returns the smaller of two doubles.

Parameters:: x - a double; y - a double
Returns:: a double, the smaller of x and y. This function considers -0.0 to be less than 0.0.

max

public static int max(int x,
                      int y)

Returns the larger of two ints.

Parameters:: x - an int; y - an int
Returns:: an int, the larger of x and y

max

public static long max(long x,
                       long y)

Returns the larger of two longs.

Parameters:: x - a long; y - a long
Returns:: a long, the larger of x and y

max

public static float max(float x,
                        float y)

Returns the larger of two floats.

Parameters:: x - a float; y - a float
Returns:: a float, the larger of x and y. This function considers -0.0f to be less than 0.0f.

max

public static double max(double x,
                         double y)

Returns the larger of two doubles.

Parameters:: x - a double; y - a double
Returns:: a double, the larger of x and y. This function considers -0.0 to be less than 0.0.

round

public static int round(float x)

Returns the integer closest to a given float.

Parameters:: x - a float
Returns:: the int closest to x

round

public static long round(double x)

Returns the long closest to a given double.

Parameters:: x - a double
Returns:: the long closest to x

random

public static double random()

Returns a random number from a uniform distribution.

Returns:: a double representing a random number from a uniform distribution

ceil

public static double ceil(double x)

Returns the value of a double rounded toward positive infinity to an integral value.

Parameters:: x - a double
Returns:: the smallest double, not less than x, that is an integral value

floor

public static double floor(double x)

Returns the value of a double rounded toward negative infinity to an integral value.

Parameters:: x - a double
Returns:: the smallest double, not greater than x, that is an integral value

rint

public static double rint(double x)

Returns the value of a double rounded toward the closest integral value.

Parameters:: x - a double
Returns:: the double closest to x that is an integral value

IEEEremainder

public static double IEEEremainder(double x,
                                   double p)

Returns the IEEE remainder from x divided by p. The IEEE remainder is

as if in infinite precise arithmetic, where [x/p] is the (infinite bit) integer nearest x/p (in half way case choose the even one).

Parameters:: x - a double, the dividend; p - a double, the divisor
Returns:: a double representing the remainder computed according to the IEEE 754 standard.

sqrt

public static double sqrt(double x)

Returns the square root of a double.

Parameters:: x - a double
Returns:: a double representing the square root of x

exp

public static double exp(double x)

Returns the exponential of a double. Special cases: $e^{infty}$ is

, $e^{rm {NaN}}$ is NaN; $e^{-infty}$ is 0, and for finite argument, only

is exact.

Parameters:: x - a double.
Returns:: a double representing .

log

public static double log(double x)

Returns the natural logarithm of a double.

Parameters:: x - a double
Returns:: a double representing the natural (base e) logarithm of x

sin

public static double sin(double x)

Returns the sine of a double.

Parameters:: x - a double, assumed to be in radians
Returns:: a double, the sine of x

cos

public static double cos(double x)

Returns the cosine of a double.

Parameters:: x - a double, assumed to be in radians
Returns:: a double, the cosine of x

tan

public static double tan(double x)

Returns the tangent of a double.

Parameters:: x - a double, assumed to be in radians
Returns:: a double, the tangent of x

asin

public static double asin(double x)

Returns the inverse (arc) sine of a double.

Parameters:: x - a double
Returns:: a double representing the angle, in radians, whose sine is x. It is in the range .

acos

public static double acos(double x)

Returns the inverse (arc) cosine of a double.

Parameters:: x - a double
Returns:: a double representing the angle, in radians, whose cosine is x. It is in the range .

atan

public static double atan(double x)

Returns the inverse (arc) tangent of a double.

Parameters:: x - a double
Returns:: a double representing the angle, in radians, whose tangent is x. It is in the range .

atan2

public static double atan2(double y,
                           double x)

Returns the angle corresponding to a Cartesian point.

Parameters:: x - a double, the first argument; y - a double, the second argument
Returns:: a double representing the angle, in radians, the the line from (0,0) to (x,y) makes with the x-axis. It is in the range .

pow

public static double pow(double x,
                         double y)

Returns x to the power y.

Parameters:: x - a double, the base; y - a double, the exponent
Returns:: a double, x to the power y

Overview

Package

Class

Tree

Deprecated

Index

Help

JMSL^TM Numerical Library 3.0

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

com.imsl.math Class JMath

PI

E

abs

abs

abs

abs

min

min

min

min

max

max

max

max

round

round

random

ceil

floor

rint

IEEEremainder

sqrt

exp

log

sin

cos

tan

asin

acos

atan

atan2

pow

com.imsl.math
Class JMath