org.jplot2d.util

Class NumberArrayUtils

java.lang.Object

org.jplot2d.util.NumberArrayUtils

public class NumberArrayUtils
extends java.lang.Object

This utilities offer some high performance routine for number array. Saving loop can improve performance especially when the array is very large.

Constructor Summary

Constructors

Constructor and Description
NumberArrayUtils()

Method Summary

Modifier and Type	Method and Description
static double[]	arrayCopy(double[] array, int length) Copy an array into a new array with the given length.
static int[]	arrayCopy(int[] array, int length) Copy an array into a new array with the given length.
static java.lang.Object	clone(java.lang.Object a)
static double[]	copyAppend(double[] array, double[] append)
static boolean	equals(java.lang.Object a, java.lang.Object b)
static int[]	getIdxesOfMinValue(double[] array) Returns the indexes of the min value of the given array.
static int[]	getIdxesOfValue(double[] array, double v)
static int[]	getIdxesOfValueBetween(ArrayPair xy, double xLo, double xHi, double yLo, double yHi)
static double[]	hypot(ArrayPair xy, double bx, double by) Returns the distance of the every point in ArrayPair to the base point given in bx and by.
static double[]	hypot(double[] x, double[] y)
static double	max(double[] array) Double.NaN is ignored.
static double	min(double[] array) Double.NaN is ignored.
static double[]	minMax(double[] array) Double.NaN is ignored.
static double[]	multiply(double[] v, double factor)
static float[]	multiply(float[] v, double factor)
static double[]	range(int n)
static double[]	reverse(double[] array)
static long[]	reverse(long[] array)
static java.lang.Object	subArray(java.lang.Object array, int[] indexes)
static java.lang.String	toString(boolean[] array)
static java.lang.String	toString(byte[] array)
static java.lang.String	toString(double[] array)
static java.lang.String	toString(float[] array)
static java.lang.String	toString(int[] array)
static java.lang.String	toString(long[] array)
static java.lang.String	toString(java.lang.Object array) Returns a string comma delimited without brackets.
static java.lang.String	toString(short[] array)

Methods inherited from class java.lang.Object

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

Constructor Detail

NumberArrayUtils

public NumberArrayUtils()

Method Detail

range

public static double[] range(int n)

copyAppend

public static double[] copyAppend(double[] array,
                                  double[] append)

min

public static double min(double[] array)

Double.NaN is ignored. If the array contains only Double.NaN, returns Double.NaN

Parameters:

array -

Returns:

the min value

max

public static double max(double[] array)

Double.NaN is ignored. If the array contains only Double.NaN, returns Double.NaN

Parameters:

array -

Returns:

athe max value

minMax

public static double[] minMax(double[] array)

Double.NaN is ignored. If the array contains only Double.NaN, returns { Double.NaN, Double.NaN }.

Parameters:

array -

Returns:

an array that contains min and max values

getIdxesOfValue

public static int[] getIdxesOfValue(double[] array,
                                    double v)

Parameters:

array -

Returns:

the idx of min value.

getIdxesOfMinValue

public static int[] getIdxesOfMinValue(double[] array)

Returns the indexes of the min value of the given array. Double.NaN is ignored. If the array contains only Double.NaN, returns int[0].

Parameters:

array -

Returns:

the indexes.

arrayCopy

public static int[] arrayCopy(int[] array,
                              int length)

Copy an array into a new array with the given length.

Parameters:

array -

length -

Returns:

a new array with the given length.

arrayCopy

public static double[] arrayCopy(double[] array,
                                 int length)

Copy an array into a new array with the given length.

Parameters:

array -

length -

Returns:

a new array with the given length.

hypot

public static double[] hypot(double[] x,
                             double[] y)

hypot

public static double[] hypot(ArrayPair xy,
                             double bx,
                             double by)

Returns the distance of the every point in ArrayPair to the base point given in bx and by.

Parameters:

xy -

bx -

by -

Returns:

multiply

public static double[] multiply(double[] v,
                                double factor)

multiply

public static float[] multiply(float[] v,
                               double factor)

getIdxesOfValueBetween

public static int[] getIdxesOfValueBetween(ArrayPair xy,
                                           double xLo,
                                           double xHi,
                                           double yLo,
                                           double yHi)

reverse

public static long[] reverse(long[] array)

reverse

public static double[] reverse(double[] array)

subArray

public static java.lang.Object subArray(java.lang.Object array,
                                        int[] indexes)

toString

public static java.lang.String toString(java.lang.Object array)

Returns a string comma delimited without brackets.

Parameters:

array -

Returns:

toString

public static java.lang.String toString(double[] array)

toString

public static java.lang.String toString(float[] array)

toString

public static java.lang.String toString(long[] array)

toString

public static java.lang.String toString(int[] array)

toString

public static java.lang.String toString(short[] array)

toString

public static java.lang.String toString(byte[] array)

toString

public static java.lang.String toString(boolean[] array)

equals

public static boolean equals(java.lang.Object a,
                             java.lang.Object b)

clone

public static java.lang.Object clone(java.lang.Object a)