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org.dinopolis.gpstool.util.angle
Class XMath
java.lang.Objectorg.dinopolis.gpstool.util.angle.XMath
- public final class XMath
- extends java.lang.Object
Simple mathematical functions. Some of these functions will
be removed if JavaSoft provide a standard implementation
or fix some issues in Bug Parade:
- Implement log10 (base 10 logarithm)
- implement pow10 (power of 10) with optimization for integer powers/li>
- Math.acos is very slow
- Version:
- $Id: XMath.java,v 1.1.1.1 2003/01/10 15:33:37 cdaller Exp $
| Field Summary | |
static double |
LN10
Natural logarithm of 10. |
private static double[] |
POW10
Table of some integer powers of 10. |
| Constructor Summary | |
private |
XMath()
Do not allow instantiation of this class. |
| Method Summary | |
static double |
cbrt(double x)
Combute the cubic root of the specified value. |
static double |
hypot(double x,
double y)
Compute the hypotenuse ( sqrt(x²+y²)). |
static double |
log10(double x)
Compute the logarithm in base 10. |
static double |
next(double f)
Finds the least double greater than f. |
static float |
next(float f)
Finds the least float greater than f. |
private static float |
next(float f,
boolean positive)
Finds the least float greater than d (if positive == true), or the greatest float less than d (if positive == false). |
static double |
pow10(double x)
Compute 10 power x. |
static double |
pow10(int x)
Compute x to the power of 10. |
static double |
previous(double f)
Finds the greatest double less than f. |
static float |
previous(float f)
Finds the greatest float less than f. |
static byte |
sgn(byte x)
Returns the sign of x. |
static int |
sgn(double x)
Returns the sign of x. |
static int |
sgn(float x)
Returns the sign of x. |
static int |
sgn(int x)
Returns the sign of x. |
static int |
sgn(long x)
Returns the sign of x. |
static short |
sgn(short x)
Returns the sign of x. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
LN10
public static final double LN10
- Natural logarithm of 10.
Approximately equal to 2.302585.
- See Also:
- Constant Field Values
POW10
private static final double[] POW10
- Table of some integer powers of 10. Used
for fast computation of
pow10(int)55 .
| Constructor Detail |
XMath
private XMath()
- Do not allow instantiation of this class.
| Method Detail |
cbrt
public static double cbrt(double x)
- Combute the cubic root of the specified value. This is method will be removed if
RFE
4633024 is implemented.
hypot
public static double hypot(double x,
double y)
- Compute the hypotenuse (
sqrt(x²+y²)).
log10
public static double log10(double x)
- Compute the logarithm in base 10. See
http://developer.java.sun.com/developer/bugParade/bugs/4074599.html.
pow10
public static double pow10(double x)
- Compute 10 power x.
pow10
public static double pow10(int x)
- Compute x to the power of 10. This computation is very fast
for small power of 10 but has some rounding error issues (see
http://developer.java.sun.com/developer/bugParade/bugs/4358794.html).
sgn
public static int sgn(double x)
- Returns the sign of x. This method returns
-1 if x is negative,
0 if x is null or
NaNand +1 if x is positive.
sgn
public static int sgn(float x)
- Returns the sign of x. This method returns
-1 if x is negative,
0 if x is null or
NaNand +1 if x is positive.
sgn
public static int sgn(long x)
- Returns the sign of x. This method returns
-1 if x is negative,
0 if x is null and
+1 if x is positive.
sgn
public static int sgn(int x)
- Returns the sign of x. This method returns
-1 if x is negative,
0 if x is null and
+1 if x is positive.
sgn
public static short sgn(short x)
- Returns the sign of x. This method returns
-1 if x is negative,
0 if x is null and
+1 if x is positive.
sgn
public static byte sgn(byte x)
- Returns the sign of x. This method returns
-1 if x is negative,
0 if x is null and
+1 if x is positive.
next
private static float next(float f,
boolean positive)
- Finds the least float greater than d (if positive == true),
or the greatest float less than d (if positive == false).
If NaN, returns same value. This code is an adaptation of
ChoiceFormat.nextDouble(double)>
ChoiceFormat.nextDouble(double)55 .
next
public static float next(float f)
- Finds the least float greater than f.
If
NaN, returns same value.
previous
public static float previous(float f)
- Finds the greatest float less than f.
If
NaN, returns same value.
next
public static double next(double f)
- Finds the least double greater than f.
If
NaN, returns same value.
previous
public static double previous(double f)
- Finds the greatest double less than f.
If
NaN, returns same value.
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SUMMARY: JAVADOC | SOURCE | DOWNLOAD | NESTED | FIELD | CONSTR | METHOD |
DETAIL: FIELD | CONSTR | METHOD | ||||||||