edu.uci.jforests.util

Class MathUtil

java.lang.Object

edu.uci.jforests.util.MathUtil

public class MathUtil
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
MathUtil()

Method Summary

Modifier and Type	Method and Description
static double[][]	allocateDoubleMatrix(int m, int n)
static void	clearDoubleMatrix(double[][] mat)
static double[][]	cloneDoubleMatrix(double[][] src)
static void	divideInPlace(float[] vector, float val) Divides the second vector from the first one (vector1[i] /= val)
static double	getAvg(double[] arr)
static double	getAvg(float[] arr)
static double	getAvg(java.util.List<java.lang.Double> arr)
static double	getDotProduct(double[] vector1, double[] vector2, int length)
static double	getDotProduct(float[] vector1, float[] vector2)
static double	getDotProduct(float[] vector1, float[] vector2, int length)
static double	getStd(double[] arr)
static double	getStd(double[] arr, double avg)
static double	getStd(double[] arr, double avg, int offset, int count)
static double	getStd(java.util.List<java.lang.Double> arr)
static double	getStd(java.util.List<java.lang.Double> arr, double avg)
static double	getVectorSize(double[] arr)
static double	log2(double value)

Methods inherited from class java.lang.Object

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

Constructor Detail

MathUtil

public MathUtil()

Method Detail

log2

public static double log2(double value)

getAvg

public static double getAvg(double[] arr)

getAvg

public static double getAvg(float[] arr)

getAvg

public static double getAvg(java.util.List<java.lang.Double> arr)

getStd

public static double getStd(double[] arr)

getStd

public static double getStd(java.util.List<java.lang.Double> arr)

getStd

public static double getStd(double[] arr,
                            double avg)

getStd

public static double getStd(double[] arr,
                            double avg,
                            int offset,
                            int count)

getStd

public static double getStd(java.util.List<java.lang.Double> arr,
                            double avg)

getVectorSize

public static double getVectorSize(double[] arr)

getDotProduct

public static double getDotProduct(float[] vector1,
                                   float[] vector2,
                                   int length)

getDotProduct

public static double getDotProduct(double[] vector1,
                                   double[] vector2,
                                   int length)

getDotProduct

public static double getDotProduct(float[] vector1,
                                   float[] vector2)

divideInPlace

public static void divideInPlace(float[] vector,
                                 float val)

Divides the second vector from the first one (vector1[i] /= val)

Parameters:

vector - the input vector.

val - the denominator

allocateDoubleMatrix

public static double[][] allocateDoubleMatrix(int m,
                                              int n)

clearDoubleMatrix

public static void clearDoubleMatrix(double[][] mat)

cloneDoubleMatrix

public static double[][] cloneDoubleMatrix(double[][] src)