org.geotools.referencing.operation.matrix

Class Matrix2

Object

Matrix2

All Implemented Interfaces:

Serializable, Cloneable, XMatrix, Matrix

public class Matrix2
extends Object
implements XMatrix, Serializable

A matrix of fixed 2×2 size.

Since:

2.2

Author:

Martin Desruisseaux (IRD)

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
double	m00 The first matrix element in the first row.
double	m01 The second matrix element in the first row.
double	m10 The first matrix element in the second row.
double	m11 The second matrix element in the second row.
static int	SIZE The matrix size, which is 2.

Constructor Summary

Constructors

Constructor and Description
Matrix2() Creates a new identity matrix.
Matrix2(double m00, double m01, double m10, double m11) Creates a new matrix initialized to the specified values.
Matrix2(Matrix matrix) Creates a new matrix initialized to the same value than the specified one.

Method Summary

Modifier and Type	Method and Description
void	add(double scalar) Performs an in-place scalar addition.
void	add(double scalar, XMatrix matrix) Set to the scalar addition of scalar+matrix
void	add(XMatrix matrix) Set to the matrix addition of this+matrix.
void	add(XMatrix matrix1, XMatrix matrix2) Set to the matrix addition of matrix1+matrix2.
Matrix2	clone() Returns a clone of this matrix.
double	determinate() Computes the determinant
boolean	equals(Matrix matrix, double tolerance) Compares the element values.
boolean	equals(Object object) Returns true if the specified object is of type Matrix2 and all of the data members are equal to the corresponding data members in this matrix.
void	getColumn(int column, double[] array) Extract col to provided array.
double	getElement(int row, int col) Returns the element at the specified index.
int	getNumCol() Returns the number of colmuns in this matrix, which is always 2 in this implementation.
int	getNumRow() Returns the number of rows in this matrix, which is always 2 in this implementation.
void	getRow(int row, double[] array) Extract row to provided array
int	hashCode() Returns a hash code value based on the data values in this object.
void	invert() Inverts this matrix in place.
void	invert(Matrix matrix) Set to the inverse of the provided matrix.
boolean	isAffine() Returns true if this matrix is an affine transform.
boolean	isIdentity() Returns true if this matrix is an identity matrix.
boolean	isIdentity(double tolerance) Returns true if this matrix is an identity matrix using the provided tolerance.
void	mul(double scalar) Sets this matrix to the result of multiplying itself with the provided scalar.
void	mul(double scalar, Matrix matrix) Sets the value of this matrix to the result of multiplying the provided scalar and matrix.
void	mul(Matrix matrix) Sets the value of this matrix to the result of multiplying itself with the specified matrix.
void	mul(Matrix matrix1, Matrix matrix2) Sets the value of this matrix to the result of multiplying matrix1 and matrix2.
void	multiply(Matrix matrix) Sets the value of this matrix to the result of multiplying itself with the specified matrix.
void	negate() Negates the value of this matrix: this = -this.
void	negate(Matrix matrix) Negates the value of this matrix: this = -matrix.
void	setColumn(int column, double... values) Sets the value of the column using an array of values.
void	setElement(int row, int col, double value) Modifies the value at the specified row and column of this matrix.
void	setIdentity() Sets this matrix to the identity matrix.
void	setRow(int row, double... values) Sets the value of the row using an array of values.
void	setZero() Sets all the values in this matrix to zero.
void	sub(double scalar) In-place matrix subtraction: this - scalar.
void	sub(double scalar, Matrix matrix) Set to the difference of scalar - matrix2.
void	sub(Matrix matrix) In-place matrix subtraction: this - matrix.
void	sub(Matrix matrix1, Matrix matrix2) Set to the difference of matrix1 - matrix2.
String	toString() Returns a string representation of this matrix.
void	transpose() Sets the value of this matrix to its transpose.
void	transpose(Matrix matrix) Set to the transpose of the provided matrix.

Methods inherited from class Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

SIZE

public static final int SIZE

The matrix size, which is 2.

See Also:

Constant Field Values

m00

public double m00

The first matrix element in the first row.

m01

public double m01

The second matrix element in the first row.

m10

public double m10

The first matrix element in the second row.

m11

public double m11

The second matrix element in the second row.

Constructor Detail

Matrix2

public Matrix2()

Creates a new identity matrix.

Matrix2

public Matrix2(double m00,
               double m01,
               double m10,
               double m11)

Creates a new matrix initialized to the specified values.

Matrix2

public Matrix2(Matrix matrix)

Creates a new matrix initialized to the same value than the specified one. The specified matrix size must be 2×2.

Method Detail

getNumRow

public final int getNumRow()

Returns the number of rows in this matrix, which is always 2 in this implementation.

Specified by:

getNumRow in interface XMatrix

Specified by:

getNumRow in interface Matrix

Returns:

The number of rows in this matrix.

getNumCol

public final int getNumCol()

Returns the number of colmuns in this matrix, which is always 2 in this implementation.

Specified by:

getNumCol in interface XMatrix

Specified by:

getNumCol in interface Matrix

Returns:

The number of columns in this matrix.

getElement

public final double getElement(int row,
                               int col)

Returns the element at the specified index.

Specified by:

getElement in interface XMatrix

Specified by:

getElement in interface Matrix

Parameters:

row - The row number to be retrieved (zero indexed).

col - The column number to be retrieved (zero indexed).

Returns:

The value at the indexed element.

setElement

public final void setElement(int row,
                             int col,
                             double value)

Modifies the value at the specified row and column of this matrix.

Specified by:

setElement in interface Matrix

Parameters:

row - The row number to be retrieved (zero indexed).

col - The column number to be retrieved (zero indexed).

value - The new matrix element value.

setZero

public final void setZero()

Sets all the values in this matrix to zero.

Specified by:

setZero in interface XMatrix

setIdentity

public final void setIdentity()

Sets this matrix to the identity matrix.

Specified by:

setIdentity in interface XMatrix

isIdentity

public final boolean isIdentity()

Returns true if this matrix is an identity matrix.

Specified by:

isIdentity in interface Matrix

Returns:

true if this matrix is an identity matrix.

isIdentity

public final boolean isIdentity(double tolerance)

Returns true if this matrix is an identity matrix using the provided tolerance. This method is equivalent to computing the difference between this matrix and an identity matrix of identical size, and returning true if and only if all differences are smaller than or equal to tolerance.

Specified by:

isIdentity in interface XMatrix

Parameters:

tolerance - The tolerance value.

Returns:

true if this matrix is close enough to the identity matrix given the tolerance value.

isAffine

public final boolean isAffine()

Returns true if this matrix is an affine transform. A transform is affine if the matrix is square and last row contains only zeros, except in the last column which contains 1.

Specified by:

isAffine in interface XMatrix

Returns:

true if this matrix is affine.

negate

public final void negate()

Negates the value of this matrix: this = -this.

Specified by:

negate in interface XMatrix

negate

public void negate(Matrix matrix)

Description copied from interface: XMatrix

Negates the value of this matrix: this = -matrix.

Specified by:

negate in interface XMatrix

Parameters:

matrix - Matrix to negated

transpose

public final void transpose()

Sets the value of this matrix to its transpose.

Specified by:

transpose in interface XMatrix

transpose

public void transpose(Matrix matrix)

Description copied from interface: XMatrix

Set to the transpose of the provided matrix.

Specified by:

transpose in interface XMatrix

Parameters:

matrix - The original matrix. Not modified.

invert

public final void invert()

Inverts this matrix in place.

Specified by:

invert in interface XMatrix

invert

public void invert(Matrix matrix)
            throws SingularMatrixException

Description copied from interface: XMatrix

Set to the inverse of the provided matrix.

Specified by:

invert in interface XMatrix

Parameters:

matrix - The matrix that is to be inverted. Not modified.

Throws:

SingularMatrixException - if this matrix is not invertible.

multiply

public final void multiply(Matrix matrix)

Description copied from interface: XMatrix

Sets the value of this matrix to the result of multiplying itself with the specified matrix. In other words, performs this = this × matrix. In the context of coordinate transformations, this is equivalent to AffineTransform.concatenate: first transforms by the supplied transform and then transform the result by the original transform.

Specified by:

multiply in interface XMatrix

Parameters:

matrix - The matrix to multiply to this matrix.

equals

public boolean equals(Matrix matrix,
                      double tolerance)

Compares the element values.

Specified by:

equals in interface XMatrix

Parameters:

matrix - The matrix to compare.

tolerance - The tolerance value.

Returns:

true if this matrix is close enough to the given matrix given the tolerance value.

equals

public boolean equals(Object object)

Returns true if the specified object is of type Matrix2 and all of the data members are equal to the corresponding data members in this matrix.

Overrides:

equals in class Object

hashCode

public int hashCode()

Returns a hash code value based on the data values in this object.

Overrides:

hashCode in class Object

toString

public String toString()

Returns a string representation of this matrix. The returned string is implementation dependent. It is usually provided for debugging purposes only.

Overrides:

toString in class Object

clone

public Matrix2 clone()

Returns a clone of this matrix.

Specified by:

clone in interface Matrix

Overrides:

clone in class Object

Returns:

A clone of this matrix.

See Also:

Object.clone()

getRow

public void getRow(int row,
                   double[] array)

Description copied from interface: XMatrix

Extract row to provided array

Specified by:

getRow in interface XMatrix

setRow

public void setRow(int row,
                   double... values)

Description copied from interface: XMatrix

Sets the value of the row using an array of values.

Specified by:

setRow in interface XMatrix

getColumn

public void getColumn(int column,
                      double[] array)

Description copied from interface: XMatrix

Extract col to provided array.

Specified by:

getColumn in interface XMatrix

setColumn

public void setColumn(int column,
                      double... values)

Description copied from interface: XMatrix

Sets the value of the column using an array of values.

Specified by:

setColumn in interface XMatrix

add

public void add(double scalar)

Description copied from interface: XMatrix

Performs an in-place scalar addition.

Specified by:

add in interface XMatrix

Parameters:

scalar - The value that's added to each element.

add

public void add(double scalar,
                XMatrix matrix)

Description copied from interface: XMatrix

Set to the scalar addition of scalar+matrix

Specified by:

add in interface XMatrix

Parameters:

scalar - The value that's added to each element.

matrix - The matrix that is to be added. Not modified.

add

public void add(XMatrix matrix)

Description copied from interface: XMatrix

Set to the matrix addition of this+matrix.

Specified by:

add in interface XMatrix

Parameters:

matrix - The matrix that is to be added. Not modified.

add

public void add(XMatrix matrix1,
                XMatrix matrix2)

Description copied from interface: XMatrix

Set to the matrix addition of matrix1+matrix2.

Specified by:

add in interface XMatrix

Parameters:

matrix1 - First matrix to be added. Not modified.

matrix2 - Second matrix to be added. Not modified.

determinate

public double determinate()

Description copied from interface: XMatrix

Computes the determinant

Specified by:

determinate in interface XMatrix

mul

public void mul(double scalar)

Description copied from interface: XMatrix

Sets this matrix to the result of multiplying itself with the provided scalar.

Specified by:

mul in interface XMatrix

mul

public void mul(double scalar,
                Matrix matrix)

Description copied from interface: XMatrix

Sets the value of this matrix to the result of multiplying the provided scalar and matrix.

Specified by:

mul in interface XMatrix

mul

public void mul(Matrix matrix)

Description copied from interface: XMatrix

Sets the value of this matrix to the result of multiplying itself with the specified matrix. In other words, performs this = this × matrix. In the context of coordinate transformations, this is equivalent to AffineTransform.concatenate: first transforms by the supplied transform and then transform the result by the original transform.

Specified by:

mul in interface XMatrix

Parameters:

matrix - The matrix to multiply to this matrix.

mul

public void mul(Matrix matrix1,
                Matrix matrix2)

Description copied from interface: XMatrix

Sets the value of this matrix to the result of multiplying matrix1 and matrix2.

Specified by:

mul in interface XMatrix

sub

public void sub(double scalar)

Description copied from interface: XMatrix

In-place matrix subtraction: this - scalar.

Specified by:

sub in interface XMatrix

sub

public void sub(double scalar,
                Matrix matrix)

Description copied from interface: XMatrix

Set to the difference of scalar - matrix2.

Specified by:

sub in interface XMatrix

sub

public void sub(Matrix matrix)

Description copied from interface: XMatrix

In-place matrix subtraction: this - matrix.

Specified by:

sub in interface XMatrix

sub

public void sub(Matrix matrix1,
                Matrix matrix2)

Description copied from interface: XMatrix

Set to the difference of matrix1 - matrix2.

Specified by:

sub in interface XMatrix

Parameters:

matrix1 - matrix, not modified

matrix2 - matrix, not modified