public final class MathUtils extends Object
ArithmeticUtils, 
Precision, 
MathArrays| Modifier and Type | Field and Description | 
|---|---|
| static double | PI_SQUARED\(\pi^2\) | 
| static double | TWO_PI\(2\pi\) | 
| Modifier and Type | Method and Description | 
|---|---|
| static void | checkFinite(double x)Check that the argument is a real number. | 
| static void | checkFinite(double[] val)Check that all the elements are real numbers. | 
| static void | checkNotNull(Object o)Checks that an object is not null. | 
| static void | checkNotNull(Object o,
            Localizable pattern,
            Object... args)Checks that an object is not null. | 
| static byte | copySign(byte magnitude,
        byte sign)Returns the first argument with the sign of the second argument. | 
| static int | copySign(int magnitude,
        int sign)Returns the first argument with the sign of the second argument. | 
| static long | copySign(long magnitude,
        long sign)Returns the first argument with the sign of the second argument. | 
| static short | copySign(short magnitude,
        short sign)Returns the first argument with the sign of the second argument. | 
| static boolean | equals(double x,
      double y)Returns  trueif the values are equal according to semantics ofDouble.equals(Object). | 
| static int | hash(double value)Returns an integer hash code representing the given double value. | 
| static int | hash(double[] value)Returns an integer hash code representing the given double array. | 
| static <T extends RealFieldElement<T>>  | max(T e1,
   T e2)Find the maximum of two field elements. | 
| static <T extends RealFieldElement<T>>  | min(T e1,
   T e2)Find the minimum of two field elements. | 
| static double | normalizeAngle(double a,
              double center)Normalize an angle in a 2π wide interval around a center value. | 
| static double | reduce(double a,
      double period,
      double offset)Reduce  |a - offset|to the primary interval[0, |period|). | 
public static final double TWO_PI
public static final double PI_SQUARED
public static int hash(double value)
value - the value to be hashedpublic static boolean equals(double x,
             double y)
true if the values are equal according to semantics of
 Double.equals(Object).x - Valuey - Valuenew Double(x).equals(new Double(y))public static int hash(double[] value)
value - the value to be hashed (may be null)public static double normalizeAngle(double a,
                    double center)
This method has three main uses:
a = MathUtils.normalizeAngle(a, FastMath.PI);a = MathUtils.normalizeAngle(a, 0.0);angle = MathUtils.normalizeAngle(end, start) - start;Note that due to numerical accuracy and since π cannot be represented exactly, the result interval is closed, it cannot be half-closed as would be more satisfactory in a purely mathematical view.
a - angle to normalizecenter - center of the desired 2π interval for the resultpublic static <T extends RealFieldElement<T>> T max(T e1, T e2)
T - the type of the field elementse1 - first elemente2 - second elementpublic static <T extends RealFieldElement<T>> T min(T e1, T e2)
T - the type of the field elementse1 - first elemente2 - second elementpublic static double reduce(double a,
            double period,
            double offset)
Reduce |a - offset| to the primary interval
 [0, |period|).
Specifically, the value returned is 
 a - |period| * floor((a - offset) / |period|) - offset.
If any of the parameters are NaN or infinite, the result is
 NaN.
a - Value to reduce.period - Period.offset - Value that will be mapped to 0.[0 |period|),
 that corresponds to a.public static byte copySign(byte magnitude,
            byte sign)
                     throws MathArithmeticException
magnitude - Magnitude of the returned value.sign - Sign of the returned value.magnitude and with the
 same sign as the sign argument.MathArithmeticException - if magnitude == Byte.MIN_VALUE
 and sign >= 0.public static short copySign(short magnitude,
             short sign)
                      throws MathArithmeticException
magnitude - Magnitude of the returned value.sign - Sign of the returned value.magnitude and with the
 same sign as the sign argument.MathArithmeticException - if magnitude == Short.MIN_VALUE
 and sign >= 0.public static int copySign(int magnitude,
           int sign)
                    throws MathArithmeticException
magnitude - Magnitude of the returned value.sign - Sign of the returned value.magnitude and with the
 same sign as the sign argument.MathArithmeticException - if magnitude == Integer.MIN_VALUE
 and sign >= 0.public static long copySign(long magnitude,
            long sign)
                     throws MathArithmeticException
magnitude - Magnitude of the returned value.sign - Sign of the returned value.magnitude and with the
 same sign as the sign argument.MathArithmeticException - if magnitude == Long.MIN_VALUE
 and sign >= 0.public static void checkFinite(double x)
                        throws NotFiniteNumberException
x - Argument.NotFiniteNumberException - if x is not a
 finite real number.public static void checkFinite(double[] val)
                        throws NotFiniteNumberException
val - Arguments.NotFiniteNumberException - if any values of the array is not a
 finite real number.public static void checkNotNull(Object o, Localizable pattern, Object... args) throws NullArgumentException
o - Object to be checked.pattern - Message pattern.args - Arguments to replace the placeholders in pattern.NullArgumentException - if o is null.public static void checkNotNull(Object o) throws NullArgumentException
o - Object to be checked.NullArgumentException - if o is null.Copyright © 2003–2016 The Apache Software Foundation. All rights reserved.