IEEE (JMSL Numerical Library)

java.lang.Object
- com.imsl.math.IEEE

```
public class IEEE
extends Object
```
Pure Java implementation of the IEEE 754 functions as specified in IEEE Standard for Binary Floating-Point Arithmetic, ANSI/IEEE Standard 754-1985 (IEEE, New York).
This Java code is based on C code in the package fdlibm, which can be obtained from www.netlib.org. The original fdlibm C code contains the following notice.
Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
Developed at SunSoft, a Sun Microsystems, Inc. business. Permission to use, copy, modify, and distribute this software is freely granted, provided that this notice is preserved.

Method Summary

Methods
Modifier and Type	Method and Description
`static double`	`copysign(double x, double y)` Returns a value with the magnitude of x and with the sign bit of y.
`static boolean`	`finite(double x)` Finite number test on an argument of type double.
`static int`	`ilogb(double x)` Return the binary exponent of non-zero x.
`static boolean`	`isNaN(double x)` NaN test on an argument of type double.
`static double`	`nextAfter(double x, double y)` Returns the next machine floating-point number next to x in the direction toward y.
`static double`	`scalbn(double x, int n)` Returns 2ⁿ computed by exponent manipulation rather than by actually performing an exponentiation or a multiplication.
`static boolean`	`unordered(double x, double y)` Unordered test on a pair of `double`s.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - copysign
```
public static double copysign(double x,
              double y)
```
    Returns a value with the magnitude of x and with the sign bit of y. If y is NaN then |x| is returned.
    
    Parameters:
    x - a double from which the magnitude will be gleaned
    y - a double from which the sign will be gleaned
    
    Returns:
    a double value with magnitude x and sign of y
  - finite
```
public static boolean finite(double x)
```
    Finite number test on an argument of type double.
    
    Parameters:
    x - the double which is to be tested
    
    Returns:
    true if x is a finite number, false if x is a NaN or an infinity
  - ilogb
```
public static int ilogb(double x)
```
    Return the binary exponent of non-zero x.
    
    Parameters:
    x - a double
    
    Returns:
    an int representing the binary exponent of x. Special cases ilogb(0) = -Integer.MAX_VALUE and ${rm {ilogb}} (infty) = {rm {ilogb}} (-infty) = {rm {ilogb}} (NaN) = {rm {Integer.MAX_VALUE}}$ .
    See Also:
    Integer.MAX_VALUE
  - isNaN
```
public static boolean isNaN(double x)
```
    NaN test on an argument of type double.
    
    Parameters:
    x - the double which is to be tested
    
    Returns:
    true if x is a NaN, false otherwise
  - nextAfter
```
public static double nextAfter(double x,
               double y)
```
    Returns the next machine floating-point number next to x in the direction toward y.
    
    Parameters:
    x - a double
    y - a double
    
    Returns:
    a double which represents the value which is closest to x in the interval bounded by x and y
  - scalbn
```
public static double scalbn(double x,
            int n)
```
    Returns 2ⁿ computed by exponent manipulation rather than by actually performing an exponentiation or a multiplication.
    
    Parameters:
    x - a double
    n - an int representing the power to which 2 is raised
    
    Returns:
    a double representing .
  - unordered
```
public static boolean unordered(double x,
                double y)
```
    Unordered test on a pair of doubles. Tests whether either of a pair of doubles is a NaN.
    
    Parameters:
    x - a double
    y - a double
    
    Returns:
    true if either x or y is a NaN, false otherwise

Class IEEE

Method Summary

Methods inherited from class java.lang.Object

Method Detail

copysign

finite

ilogb

isNaN

nextAfter

scalbn

unordered