org.simulator.math
Class Mathematics

java.lang.Object
  org.simulator.math.Mathematics

public class Mathematics
extends Object

This class contains a collection of mathematical functions like the faculty, logarithms and several trigonometric functions.

Since:

0.9

Version:

$Rev: 331 $

Author:

Marcel Kronfeld, Andreas Dräger, Diedonné Motsuo Wouamba

Constructor Summary

Mathematics()

Method Summary

static double	factorial(double n) This method computes the factorial!
static int	min(int x, int y, int z) This just computes the minimum of three integer values.
static void	scale(double scale, double[] vec) Scales a vector with the given scalar.
static void	svMult(double s, double[] v, double[] res) Multiplies (scales) every element of the array v with s in place.
static void	svvAddAndScale(double s, double[] v, double[] w, double[] res) Add vectors scaled: res[i] = s*(v[i] + w[i])
static void	svvAddScaled(double s, double[] v, double[] w, double[] res) Add vectors scaled: res[i] = s*v[i] + w[i]
static void	swap(double a, double b) Swaps a and b if a is greater then b.
static void	vvAdd(double[] v1, double[] v2, double[] res) Add vectors in place setting res = v1 + v2.
static void	vvAddOffs(double[] v1, int v1Offs, double[] v2, int v2Offs, double[] res, int resOffs, int len) Add vectors in place setting with an offset within the target vector, meaning that res[resOffs+i]=v1[v1Offs+i]+v2[v2Offs+i] for i in length.
static double[]	vvSub(double[] a, double[] b) Subtract vectors returning a new vector c = a - b.
static void	vvSub(double[] a, double[] b, double[] res) Subtract vectors returning a new vector c = a - b.

Methods inherited from class java.lang.Object

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

Constructor Detail

Mathematics

public Mathematics()

Method Detail

factorial

public static final double factorial(double n)

This method computes the factorial! function.

Parameters:

n -

Returns:

result

swap

public static final void swap(double a,
                              double b)

Swaps a and b if a is greater then b.

Parameters:

a -

b -

min

public static int min(int x,
                      int y,
                      int z)

This just computes the minimum of three integer values.

Parameters:

x -

y -

z -

Returns:

Gives the minimum of three integers

scale

public static void scale(double scale,
                         double[] vec)

Scales a vector with the given scalar.

Parameters:

scale -

vec -

svMult

public static void svMult(double s,
                          double[] v,
                          double[] res)

Multiplies (scales) every element of the array v with s in place.

Parameters:

s - a scalar

v - an array to be multiplied with s.

svvAddAndScale

public static void svvAddAndScale(double s,
                                  double[] v,
                                  double[] w,
                                  double[] res)

Add vectors scaled: res[i] = s*(v[i] + w[i])

Parameters:

s -

v -

w -

svvAddScaled

public static void svvAddScaled(double s,
                                double[] v,
                                double[] w,
                                double[] res)

Add vectors scaled: res[i] = s*v[i] + w[i]

Parameters:

s -

v -

w -

vvAdd

public static void vvAdd(double[] v1,
                         double[] v2,
                         double[] res)

Add vectors in place setting res = v1 + v2.

Parameters:

v1 -

v2 -

vvAddOffs

public static void vvAddOffs(double[] v1,
                             int v1Offs,
                             double[] v2,
                             int v2Offs,
                             double[] res,
                             int resOffs,
                             int len)

Add vectors in place setting with an offset within the target vector, meaning that res[resOffs+i]=v1[v1Offs+i]+v2[v2Offs+i] for i in length.

Parameters:

v1 -

v2 -

vvSub

public static double[] vvSub(double[] a,
                             double[] b)

Subtract vectors returning a new vector c = a - b.

Parameters:

a -

b -

Returns:

a new vector c = a - b

vvSub

public static void vvSub(double[] a,
                         double[] b,
                         double[] res)

Subtract vectors returning a new vector c = a - b.

Parameters:

a -

b -