uavsim.flightdynamicsmodel
Class Matrix

java.lang.Object
  uavsim.flightdynamicsmodel.Matrix

All Implemented Interfaces:

java.lang.Cloneable

public class Matrix
extends java.lang.Object
implements java.lang.Cloneable

Defines a general-purpose 3x3 mathematical matrix. For compatibility with the other classes derived from the original source (Physics for Game Developers by David Bourg), the member variables are public and mutable. Eventually they will be protected appropriately. In addition, some methods inconsistently operate in place, while others behave as expected and return a new affected instance of the matrix.

Author:

Dan Tappan [17.08.11]

Field Summary

double	_e11 the elements with row/column indexing with (1,1) as top left
double	_e12 the elements with row/column indexing with (1,1) as top left
double	_e13 the elements with row/column indexing with (1,1) as top left
double	_e21 the elements with row/column indexing with (1,1) as top left
double	_e22 the elements with row/column indexing with (1,1) as top left
double	_e23 the elements with row/column indexing with (1,1) as top left
double	_e31 the elements with row/column indexing with (1,1) as top left
double	_e32 the elements with row/column indexing with (1,1) as top left
double	_e33 the elements with row/column indexing with (1,1) as top left

Constructor Summary

Matrix()
Creates a matrix with all entries zero.

Matrix(double e11, double e12, double e13, double e21, double e22, double e23, double e31, double e32, double e33)
Creates a matrix with the entries in row/column format.

Method Summary

Matrix	add(Matrix matrix) Calculates the sum of this matrix and another.
Matrix	clone()
double	determinant() Calculates the determinant of this matrix.
Matrix	divide(double scale) Calculates the scaled entries of this matrix.
Matrix	inverse() Calculates the inverse of this matrix.
Matrix	multiply(double scale) Calculates the scaled entries of this matrix.
Matrix	multiply(Matrix matrix) Calculates the product of this matrix and another.
Vector	multiply(Vector vector) Calculates the product of this matrix and a vector.
Matrix	subtract(Matrix matrix) Calculates the difference of this matrix and another.
java.lang.String	toString()
Matrix	transpose() Calculates the transpose of this matrix.

Methods inherited from class java.lang.Object

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

Field Detail

_e11

public double _e11

the elements with row/column indexing with (1,1) as top left

_e12

public double _e12

the elements with row/column indexing with (1,1) as top left

_e13

public double _e13

the elements with row/column indexing with (1,1) as top left

_e21

public double _e21

the elements with row/column indexing with (1,1) as top left

_e22

public double _e22

the elements with row/column indexing with (1,1) as top left

_e23

public double _e23

the elements with row/column indexing with (1,1) as top left

_e31

public double _e31

the elements with row/column indexing with (1,1) as top left

_e32

public double _e32

the elements with row/column indexing with (1,1) as top left

_e33

public double _e33

the elements with row/column indexing with (1,1) as top left

Constructor Detail

Matrix

public Matrix()

Creates a matrix with all entries zero.

Matrix

public Matrix(double e11,
              double e12,
              double e13,
              double e21,
              double e22,
              double e23,
              double e31,
              double e32,
              double e33)

Creates a matrix with the entries in row/column format.

Parameters:

e11 - - element row 1, column 1

e12 - - element row 1, column 2

e13 - - element row 1, column 3

e21 - - element row 2, column 1

e22 - - element row 2, column 2

e23 - - element row 2, column 3

e31 - - element row 3, column 1

e32 - - element row 3, column 2

e33 - - element row 3, column 3

Method Detail

add

public Matrix add(Matrix matrix)

Calculates the sum of this matrix and another.

Parameters:

matrix - - the other matrix

Returns:

the result as a new matrix

clone

public Matrix clone()

Overrides:

clone in class java.lang.Object

determinant

public double determinant()

Calculates the determinant of this matrix.

Returns:

the result

divide

public Matrix divide(double scale)

Calculates the scaled entries of this matrix.

Parameters:

scale - - the scale

Returns:

the result as a new matrix

inverse

public Matrix inverse()

Calculates the inverse of this matrix.

Returns:

the result as a new matrix

multiply

public Matrix multiply(double scale)

Calculates the scaled entries of this matrix.

Parameters:

scale - - the scale

Returns:

the result as a new matrix

multiply

public Matrix multiply(Matrix matrix)

Calculates the product of this matrix and another.

Parameters:

matrix - - the other matrix

Returns:

the result as a new matrix

multiply

public Vector multiply(Vector vector)

Calculates the product of this matrix and a vector.

Parameters:

vector - - the vector

Returns:

the result as a new vector

subtract

public Matrix subtract(Matrix matrix)

Calculates the difference of this matrix and another.

Parameters:

matrix - - the other matrix

Returns:

the result as a new matrix

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

transpose

public Matrix transpose()

Calculates the transpose of this matrix.

Returns:

the result as a new matrix