VirtualOrganization.Math
Class Matrix

java.lang.Object
  |
  +--VirtualOrganization.Math.Matrix

public class Matrix

extends java.lang.Object

Field Summary

double[][]	array
int	columns
int	rows

Constructor Summary

Matrix()

Matrix(double[][] arr)

Matrix(int m, int n)

Matrix(int m, int n, double v)

Matrix(VirtualOrganization.Math.Matrix other)

Method Summary

void	checkMatrixDimensions(VirtualOrganization.Math.Matrix other) Check if size(A) == size(B)
double	determinant() Matrix determinant
double	get(int i, int j)
double[][]	getArray()
double[][]	getArrayCopy()
int	getColumnDimension()
VirtualOrganization.Math.Matrix	getMatrix(int[] r, int j0, int j1) Get a submatrix.
VirtualOrganization.Math.Matrix	getMatrix(int i0, int i1, int j0, int j1) Get a submatrix.
int	getRowDimension()
static VirtualOrganization.Math.Matrix	identity(int m, int n) Generate identity matrix
VirtualOrganization.Math.Matrix	inverse() Matrix inverse or pseudoinverse
VirtualOrganization.Math.Matrix	minus(VirtualOrganization.Math.Matrix other)
VirtualOrganization.Math.Matrix	plus(VirtualOrganization.Math.Matrix other)
void	print(int w, int d) Print the matrix to stdout.
void	print(java.io.PrintWriter output, int w, int d)
void	print(java.io.PrintWriter output, java.text.NumberFormat format, int width)
void	set(int i, int j, double s)
void	setMatrix(int i0, int i1, int j0, int j1, VirtualOrganization.Math.Matrix other) Set a submatrix.
VirtualOrganization.Math.Matrix	solve(VirtualOrganization.Math.Matrix B)
VirtualOrganization.Math.Matrix	times(double s)
VirtualOrganization.Math.Matrix	times(VirtualOrganization.Math.Matrix other)
double	trace() Matrix trace.
VirtualOrganization.Math.Matrix	transpose()

Methods inherited from class java.lang.Object

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

Field Detail

array

public double[][] array

rows

public int rows

columns

public int columns

Constructor Detail

Matrix

public Matrix(VirtualOrganization.Math.Matrix other)

Matrix

public Matrix()

Matrix

public Matrix(int m,
              int n)

Matrix

public Matrix(int m,
              int n,
              double v)

Matrix

public Matrix(double[][] arr)

Method Detail

getRowDimension

public int getRowDimension()

getColumnDimension

public int getColumnDimension()

getArray

public double[][] getArray()

getArrayCopy

public double[][] getArrayCopy()

get

public double get(int i,
                  int j)

getMatrix

public VirtualOrganization.Math.Matrix getMatrix(int i0,
                                                 int i1,
                                                 int j0,
                                                 int j1)

Get a submatrix.

Parameters:

i0 - Initial row index

i1 - Final row index

j0 - Initial column index

j1 - Final column index

Returns:

A(i0:i1,j0:j1)

Throws:

java.lang.ArrayIndexOutOfBoundsException - Submatrix indices

getMatrix

public VirtualOrganization.Math.Matrix getMatrix(int[] r,
                                                 int j0,
                                                 int j1)

Get a submatrix.

Parameters:

r - Array of row indices.

Returns:

A(r(:),j0:j1)

Throws:

java.lang.ArrayIndexOutOfBoundsException - Submatrix indices

set

public void set(int i,
                int j,
                double s)

setMatrix

public void setMatrix(int i0,
                      int i1,
                      int j0,
                      int j1,
                      VirtualOrganization.Math.Matrix other)

Set a submatrix.

Parameters:

i0 - Initial row index

i1 - Final row index

j0 - Initial column index

j1 - Final column index

Throws:

java.lang.ArrayIndexOutOfBoundsException - Submatrix indices

plus

public VirtualOrganization.Math.Matrix plus(VirtualOrganization.Math.Matrix other)

minus

public VirtualOrganization.Math.Matrix minus(VirtualOrganization.Math.Matrix other)

times

public VirtualOrganization.Math.Matrix times(double s)

times

public VirtualOrganization.Math.Matrix times(VirtualOrganization.Math.Matrix other)

transpose

public VirtualOrganization.Math.Matrix transpose()

determinant

public double determinant()

Matrix determinant

Returns:

determinant

trace

public double trace()

Matrix trace.

Returns:

sum of the diagonal elements.

inverse

public VirtualOrganization.Math.Matrix inverse()

Matrix inverse or pseudoinverse

Returns:

inverse(A) if A is square, pseudoinverse otherwise.

solve

public VirtualOrganization.Math.Matrix solve(VirtualOrganization.Math.Matrix B)

identity

public static VirtualOrganization.Math.Matrix identity(int m,
                                                       int n)

Generate identity matrix

Parameters:

m - Number of rows.

n - Number of colums.

Returns:

An m-by-n matrix with ones on the diagonal and zeros elsewhere.

checkMatrixDimensions

public void checkMatrixDimensions(VirtualOrganization.Math.Matrix other)

Check if size(A) == size(B)

print

public void print(int w,
                  int d)

Print the matrix to stdout. Line the elements up in columns with a Fortran-like 'Fw.d' style format.

Parameters:

w - Column width.

d - Number of digits after the decimal.

print

public void print(java.io.PrintWriter output,
                  int w,
                  int d)

print

public void print(java.io.PrintWriter output,
                  java.text.NumberFormat format,
                  int width)