main
Class MoreMath

java.lang.Object
  main.MoreMath

public class MoreMath

extends java.lang.Object

This class includes a bunch of extra mathematical functions and other math tidbits that are useful to have around. All the functions are static and all the important ones are public, so you never actually need to instantiate this class.

Nested Class Summary

static interface	MoreMath.Comparer
class	MoreMath.PartialDerivRec A record class that's handy when assembling a Jacobian matrix from the Affectors' formulas rather than numerically.

Field Summary

static int	BROWN_NOISE
static int	GAUSSIAN
static int	UNIFORM

Constructor Summary

MoreMath()

Method Summary

static void	calcJacobian(float[] matrix, Cell cell, int num_nodes, float epsilon) Calculates the jacobian matrix for the equations in a network around the Node values of the input cell.
static void	eigenvalues(float[] a, int n, float[] wr, float[] wi) Numerical recipes in C code for finding eigenvalues of a general, real, non-symmetric matrix.
static double	getStdDev(double sum, double sum_sqr, int num) Returns the standard deviation.
static float	getStdDev(float sum, float sum_sqr, int num)
static float	pickRandomLinear(float min, float max)
static float	pickRandomLogarithmic(float min, float max)
static float	randNeg(int mode)
static float	random()
static float	random(int mode)
static int	randomInt(int min, int max) Returns an integer between min and max - 1.
static void	randomize(int[] array) Randomizes the elements in the array.
static void	setRandomSeed(int seed)
static void	sort(java.lang.Object[] a, MoreMath.Comparer comparer)
static void	sort(java.lang.Object[] a, java.lang.Object[] b, int from, int to, boolean ascending, MoreMath.Comparer comparer) Sort a and b, using a as the reference - stolen from somewhere on internet
static double	sqr(double num) Returns num * num
static float	sqr(float num)

Methods inherited from class java.lang.Object

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

Field Detail

UNIFORM

public static final int UNIFORM

See Also:

Constant Field Values

GAUSSIAN

public static final int GAUSSIAN

See Also:

Constant Field Values

BROWN_NOISE

public static final int BROWN_NOISE

See Also:

Constant Field Values

Constructor Detail

MoreMath

public MoreMath()

Method Detail

sqr

public static double sqr(double num)

Returns num * num

sqr

public static float sqr(float num)

getStdDev

public static double getStdDev(double sum,
                               double sum_sqr,
                               int num)

Returns the standard deviation. Sum is the sum of the values, sum_sqr is the sum of the squares of the values, and num is the number of values.

getStdDev

public static float getStdDev(float sum,
                              float sum_sqr,
                              int num)

setRandomSeed

public static void setRandomSeed(int seed)

random

public static float random()

random

public static float random(int mode)

randNeg

public static float randNeg(int mode)

randomInt

public static int randomInt(int min,
                            int max)

Returns an integer between min and max - 1.

pickRandomLinear

public static float pickRandomLinear(float min,
                                     float max)

pickRandomLogarithmic

public static float pickRandomLogarithmic(float min,
                                          float max)

randomize

public static void randomize(int[] array)

Randomizes the elements in the array.

calcJacobian

public static void calcJacobian(float[] matrix,
                                Cell cell,
                                int num_nodes,
                                float epsilon)

Calculates the jacobian matrix for the equations in a network around the Node values of the input cell. epsilon determines the amount to change each Node when finding the derivative.

eigenvalues

public static void eigenvalues(float[] a,
                               int n,
                               float[] wr,
                               float[] wi)
                        throws java.lang.Exception

Numerical recipes in C code for finding eigenvalues of a general, real, non-symmetric matrix. Note - this function destroys the matrix a. a is the square input matrix, n is the length of a, wr are the real parts of the eigenvalues, wi are the imaginary parts.

Throws:

java.lang.Exception

sort

public static void sort(java.lang.Object[] a,
                        MoreMath.Comparer comparer)

sort

public static void sort(java.lang.Object[] a,
                        java.lang.Object[] b,
                        int from,
                        int to,
                        boolean ascending,
                        MoreMath.Comparer comparer)

Sort a and b, using a as the reference - stolen from somewhere on internet