ir.utilities
Class MoreMath

java.lang.Object
  ir.utilities.MoreMath

public class MoreMath
extends java.lang.Object

A place to put some additional math functions

Constructor Summary

MoreMath()

Method Summary

static double[]	addVectors(double[] x, double[] y) Add two vectors and return the vector sum
static double[]	averageVectors(java.util.ArrayList<double[]> list) Average all of the vectors in a list of vectors and return the average vector.
static double	log(double x, double base) Return logarithm of a given base
static double	log(double x, int base)
static double	log(int x, double base)
static double	log(int x, int base)
static void	printVector(double[] x) Print a vector in the form [x,y,...z] to standard out
static void	printVector(double[] x, java.io.PrintStream out) Print a vector in the form [x,y,...z] to the print stream
static double	roundTo(double num, int decimalPlaces) Round a double to the given number of decimalPlaces
static double[]	vectorDivide(double[] x, double c) Divide a vector by a scalar and return the resulting vector
static double	vectorLength(double[] values)
static double	vectorOneNorm(double[] values)

Methods inherited from class java.lang.Object

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

Constructor Detail

MoreMath

public MoreMath()

Method Detail

roundTo

public static double roundTo(double num,
                             int decimalPlaces)

Round a double to the given number of decimalPlaces

log

public static double log(double x,
                         double base)

Return logarithm of a given base

log

public static double log(int x,
                         int base)

log

public static double log(double x,
                         int base)

log

public static double log(int x,
                         double base)

addVectors

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

Add two vectors and return the vector sum

vectorDivide

public static double[] vectorDivide(double[] x,
                                    double c)

Divide a vector by a scalar and return the resulting vector

averageVectors

public static double[] averageVectors(java.util.ArrayList<double[]> list)

Average all of the vectors in a list of vectors and return the average vector.

printVector

public static void printVector(double[] x)

Print a vector in the form [x,y,...z] to standard out

printVector

public static void printVector(double[] x,
                               java.io.PrintStream out)

Print a vector in the form [x,y,...z] to the print stream

vectorLength

public static double vectorLength(double[] values)

vectorOneNorm

public static double vectorOneNorm(double[] values)