Class Matrix

java.lang.Object

Matrix

public class Matrix
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
(package private) double[][]	m The values of the Matrix

Constructor Summary

Constructors

Constructor and Description
Matrix(double[][] mat) Creates a matrix from a bidimensional array
Matrix(java.io.InputStream is) Creates a matrix from an InputStream in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns.
Matrix(java.io.Reader r) Creates a matrix from a Reader in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object mi) Tells if an Object is equal to this Matrix
int	getColumnsNumber() Returns the number of columns of this Matrix
double[][]	getMatrix() Gets the bidimensional array representing this Matrix
int	getRowsNumber() Returns the number of rows of this Matrix
static double[][]	identity(int n) Returns a bidimensional array containing an identity matrix
static boolean	isRect(double[][] m) Tells if a bidimensional array is a rectangle
void	load(java.io.InputStream is) Loads a matrix from an InputStream in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns.
void	load(java.io.Reader r) Loads a matrix from an InputStream in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns.
static void	main(java.lang.String[] ar)
static double[][]	nullMatrix(int n) Returns a bidimensional array containing an zero matrix
static Matrix	one(int n) Returns the identity Matrix
int	order() Returns the order of this Matrix if it is a square matrix
static double[][]	pow(double[][] m, int n) Returns the n-th power of a bidimensional array.
Matrix	pow(int n) Returns the Matrix that n-th power of this Matrix to another Matrix
static double[][]	prod(double[][] m1, double[][] m2) Returns the cartesian product of two bidimensional arrays.
Matrix	prod(Matrix mat) Returns the Matrix that is the cartesian product of this Matrix to another Matrix
static double[][]	sum(double[][] m1, double[][] m2) Returns the sum of two bidimensional arrays.
Matrix	sum(Matrix mat) Returns the Matrix that is the sum of this Matrix to another Matrix
java.lang.String	toString() Returns a String representing this Matrix
static Matrix	zero(int n) Returns the zero Matrix

Methods inherited from class java.lang.Object

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

Field Detail

m

double[][] m

The values of the Matrix

Constructor Detail

Matrix

public Matrix(double[][] mat)

Creates a matrix from a bidimensional array

Parameters:

mat - the bidimensional array

Matrix

public Matrix(java.io.InputStream is)

Creates a matrix from an InputStream in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns. The following rows*columnes double values are the values of the Matrix

Parameters:

is - the InputStream

Matrix

public Matrix(java.io.Reader r)

Creates a matrix from a Reader in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns. The following rows*columnes double values are the values of the Matrix

Parameters:

r - the Reader

Method Detail

load

public void load(java.io.InputStream is)

Loads a matrix from an InputStream in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns. The following rows*columnes double values are the values of the Matrix

Parameters:

is - the InputStream

load

public void load(java.io.Reader r)

Loads a matrix from an InputStream in which the first integer value is the number of rows of the Matrix and the second integer value is the number of columns. The following rows*columnes double values are the values of the Matrix

Parameters:

r - the Reader

sum

public Matrix sum(Matrix mat)

Returns the Matrix that is the sum of this Matrix to another Matrix

Parameters:

mat - the Matrix to sum

Returns:

the resulting sum Matrix

sum

public static double[][] sum(double[][] m1,
             double[][] m2)

Returns the sum of two bidimensional arrays.

Parameters:

m1 - the first bidimensional array

m2 - the second bidimensional array

Returns:

the bidimensional array that is the sum of m1 and m2

isRect

public static boolean isRect(double[][] m)

Tells if a bidimensional array is a rectangle

Parameters:

m - the bidimensional array

Returns:

true if the array is a rectangle, false otherwise

prod

public Matrix prod(Matrix mat)

Returns the Matrix that is the cartesian product of this Matrix to another Matrix

Parameters:

mat - the Matrix to make the product with

Returns:

the resulting cartesian product Matrix

prod

public static double[][] prod(double[][] m1,
              double[][] m2)

Returns the cartesian product of two bidimensional arrays.

Parameters:

m1 - the first bidimensional array

m2 - the second bidimensional array

Returns:

the bidimensional array that is the cartesian product of m1 and m2

pow

public Matrix pow(int n)

Returns the Matrix that n-th power of this Matrix to another Matrix

Parameters:

n - the esponent of the power

Returns:

the resulting power Matrix

pow

public static double[][] pow(double[][] m,
             int n)

Returns the n-th power of a bidimensional array.

Parameters:

m - the first bidimensional array

n - the esponent of the power

Returns:

the bidimensional array that is the elevation of m to the n-th power

getRowsNumber

public int getRowsNumber()

Returns the number of rows of this Matrix

Returns:

the number of rows

getColumnsNumber

public int getColumnsNumber()

Returns the number of columns of this Matrix

Returns:

the number of columns

order

public int order()

Returns the order of this Matrix if it is a square matrix

Returns:

the order of this Matrix if it is a square matrix, -1 otherwise

getMatrix

public double[][] getMatrix()

Gets the bidimensional array representing this Matrix

Returns:

the bidimensional array

one

public static Matrix one(int n)

Returns the identity Matrix

Parameters:

n - the order of the identity Matrix

Returns:

the identity Matrix

identity

public static double[][] identity(int n)

Returns a bidimensional array containing an identity matrix

Parameters:

n - the order of the identity matrix

Returns:

the identity matrix bidimensional array

zero

public static Matrix zero(int n)

Returns the zero Matrix

Parameters:

n - the order of the zero Matrix

Returns:

the zero Matrix

nullMatrix

public static double[][] nullMatrix(int n)

Returns a bidimensional array containing an zero matrix

Parameters:

n - the order of the zero matrix

Returns:

the zero matrix bidimensional array

toString

public java.lang.String toString()

Returns a String representing this Matrix

Overrides:

toString in class java.lang.Object

Returns:

the String to represent this Matrix

equals

public boolean equals(java.lang.Object mi)

Tells if an Object is equal to this Matrix

Overrides:

equals in class java.lang.Object

Parameters:

mi - the Object to compare

Returns:

true if mi is a Matrix with the same elements, false otherwise

main

public static void main(java.lang.String[] ar)