nr
Class Mat_array

java.lang.Object
  nr.Mat_array

All Implemented Interfaces:

Mat

public class Mat_array
extends java.lang.Object
implements Mat

Implements a simple Mat based on a fixed array

Author:

Daniel Wachsstock

Constructor Summary

Mat_array(double[][] d)
Creates a new instance of Mat_array from a double[][].

Mat_array(int n)
Creates a new instance of Mat_array

Mat_array(Mat m)
Creates a new instance of Mat_array.

Method Summary

double[][]	asArray() get the data
Mat	copy() return a copy of this, or some version that the user can manipulate at will.
double	get(int i, int j) get an individual element
Vec	getColumn(int j) get a column
Vec	getRow(int i) get a row
static Mat	identity(int n) returns an identity matrix
void	set(int i, int j, double d) set an individual element
int	size() the size of the matrix
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Mat_array

public Mat_array(int n)

Creates a new instance of Mat_array

Parameters:

n - the size of the matrix

Mat_array

public Mat_array(double[][] d)

Creates a new instance of Mat_array from a double[][].

Parameters:

d - the source array

Throws:

java.lang.IndexOutOfBoundsException - if d is not a square array

Mat_array

public Mat_array(Mat m)

Creates a new instance of Mat_array. Copy constructor.

Parameters:

m - the Mat to copy

Method Detail

asArray

public double[][] asArray()

Description copied from interface: Mat

get the data

Specified by:

asArray in interface Mat

Returns:

the data as a double[][]

copy

public Mat copy()

Description copied from interface: Mat

return a copy of this, or some version that the user can manipulate at will. If the implementation of this is immutable, can return the original, or the implementation can do some kind of copy-on-write.

Specified by:

copy in interface Mat

Returns:

a copy of the data

get

public double get(int i,
                  int j)

Description copied from interface: Mat

get an individual element

Specified by:

get in interface Mat

Parameters:

i - the row

j - the column

Returns:

the value at i,j

getColumn

public Vec getColumn(int j)

Description copied from interface: Mat

get a column

Specified by:

getColumn in interface Mat

Parameters:

j - the column

Returns:

the actual column, or a Vec whose changes are reflected in the original matrix

getRow

public Vec getRow(int i)

Description copied from interface: Mat

get a row

Specified by:

getRow in interface Mat

Parameters:

i - the row

Returns:

the actual row, or a Vec whose changes are reflected in the original matrix

set

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

Description copied from interface: Mat

set an individual element

Specified by:

set in interface Mat

Parameters:

i - the row

j - the column

d - the value to set it to

size

public int size()

Description copied from interface: Mat

the size of the matrix

Specified by:

size in interface Mat

Returns:

the size of the square matrix

identity

public static Mat identity(int n)

returns an identity matrix

Parameters:

n - the size

Returns:

an identity matrix (A[i][j] = i==j ? 1 : 0)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object