JSci.maths.matrices
Class AbstractDoubleMatrix

java.lang.Object
  JSci.maths.matrices.Matrix
      JSci.maths.matrices.AbstractDoubleMatrix

All Implemented Interfaces:

AbelianGroup.Member, Algebra.Member, Member, Module.Member, Ring.Member, java.io.Serializable, VectorSpace.Member

Direct Known Subclasses:

AbstractDoubleSquareMatrix, DoubleMatrix, DoubleSparseMatrix

public abstract class AbstractDoubleMatrix

extends Matrix

The AbstractDoubleMatrix class provides an object for encapsulating double matrices.

See Also:

Serialized Form

Field Summary

Fields inherited from class JSci.maths.matrices.Matrix

numCols, numRows

Constructor Summary

protected

AbstractDoubleMatrix(int rows, int cols) Constructs a matrix.

Method Summary

AbelianGroup.Member	add(AbelianGroup.Member m) Returns the addition of this matrix and another.
AbstractDoubleMatrix	add(AbstractDoubleMatrix m) Returns the addition of this matrix and another.
AbstractDoubleMatrix	directSum(AbstractDoubleMatrix m) Returns the direct sum of this matrix and another.
boolean	equals(AbstractDoubleMatrix m) Compares two ${nativeTyp} matrices for equality.
boolean	equals(java.lang.Object obj) Compares two ${nativeTyp} matrices for equality.
double	frobeniusNorm() Returns the Frobenius or Hilbert-Schmidt (l2) norm.
abstract double	getElement(int i, int j) Returns an element of the matrix.
int	hashCode() Returns a hashcode for this matrix.
double	infNorm() Returns the l-norm.
AbstractDoubleMatrix	mapElements(Mapping f) Applies a function on all the matrix elements.
AbstractDoubleMatrix	multiply(AbstractDoubleMatrix m) Returns the multiplication of this matrix and another.
AbstractDoubleVector	multiply(AbstractDoubleVector v) Returns the multiplication of a vector by this matrix.
Ring.Member	multiply(Ring.Member m) Returns the multiplication of this matrix and another.
AbelianGroup.Member	negate() Returns the negative of this matrix.
AbstractDoubleMatrix	scalarDivide(double x) Returns the division of this matrix by a scalar.
VectorSpace.Member	scalarDivide(Field.Member x) Returns the division of this matrix by a scalar.
AbstractDoubleMatrix	scalarMultiply(double x) Returns the multiplication of this matrix by a scalar.
Module.Member	scalarMultiply(Ring.Member x) Returns the multiplication of this matrix by a scalar.
double	scalarProduct(AbstractDoubleMatrix m) Returns the scalar product of this matrix and another.
abstract void	setElement(int i, int j, double x) Sets the value of an element of the matrix.
AbelianGroup.Member	subtract(AbelianGroup.Member m) Returns the subtraction of this matrix by another.
AbstractDoubleMatrix	subtract(AbstractDoubleMatrix m) Returns the subtraction of this matrix by another.
AbstractDoubleMatrix	tensor(AbstractDoubleMatrix m) Returns the tensor product of this matrix and another.
AbstractComplexMatrix	toComplexMatrix() Converts this matrix to a complex matrix.
AbstractIntegerMatrix	toIntegerMatrix() Converts this matrix to an integer matrix.
java.lang.String	toString() Returns a string representing this matrix.
Matrix	transpose() Returns the transpose of this matrix.

Methods inherited from class JSci.maths.matrices.Matrix

columns, getInvalidElementMsg, rows

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDoubleMatrix

protected AbstractDoubleMatrix(int rows,
                               int cols)

Constructs a matrix.

Method Detail

equals

public final boolean equals(java.lang.Object obj)

Compares two ${nativeTyp} matrices for equality.

Parameters:

obj - a double matrix

equals

public boolean equals(AbstractDoubleMatrix m)

Compares two ${nativeTyp} matrices for equality. Two matrices are considered to be equal if the Frobenius norm of their difference is within the zero tolerance.

toString

public java.lang.String toString()

Returns a string representing this matrix.

hashCode

public int hashCode()

Returns a hashcode for this matrix.

toIntegerMatrix

public AbstractIntegerMatrix toIntegerMatrix()

Converts this matrix to an integer matrix.

Returns:

an integer matrix

toComplexMatrix

public AbstractComplexMatrix toComplexMatrix()

Converts this matrix to a complex matrix.

Returns:

a complex matrix

getElement

public abstract double getElement(int i,
                                  int j)

Returns an element of the matrix.

Parameters:

i - row index of the element

j - column index of the element

Throws:

MatrixDimensionException - If attempting to access an invalid element.

setElement

public abstract void setElement(int i,
                                int j,
                                double x)

Sets the value of an element of the matrix. Should only be used to initialise this matrix.

Parameters:

i - row index of the element

j - column index of the element

x - a number

Throws:

MatrixDimensionException - If attempting to access an invalid element.

infNorm

public double infNorm()

Returns the l-norm.

frobeniusNorm

public double frobeniusNorm()

Returns the Frobenius or Hilbert-Schmidt (l²) norm.

PlanetMath references:

FrobeniusMatrixNorm

negate

public AbelianGroup.Member negate()

Returns the negative of this matrix.

add

public final AbelianGroup.Member add(AbelianGroup.Member m)

Returns the addition of this matrix and another.

Parameters:

m - a group member

add

public AbstractDoubleMatrix add(AbstractDoubleMatrix m)

Returns the addition of this matrix and another.

Parameters:

m - a double matrix

Throws:

MatrixDimensionException - If the matrices are different sizes.

subtract

public final AbelianGroup.Member subtract(AbelianGroup.Member m)

Returns the subtraction of this matrix by another.

Parameters:

m - a group member

subtract

public AbstractDoubleMatrix subtract(AbstractDoubleMatrix m)

Returns the subtraction of this matrix by another.

Parameters:

m - a double matrix

Throws:

MatrixDimensionException - If the matrices are different sizes.

scalarMultiply

public final Module.Member scalarMultiply(Ring.Member x)

Returns the multiplication of this matrix by a scalar.

Parameters:

x - a ring member

scalarMultiply

public AbstractDoubleMatrix scalarMultiply(double x)

Returns the multiplication of this matrix by a scalar.

Parameters:

x - a double.

Returns:

a double matrix.

scalarDivide

public final VectorSpace.Member scalarDivide(Field.Member x)

Returns the division of this matrix by a scalar. Always throws an exception.

Parameters:

x - a field member

scalarDivide

public AbstractDoubleMatrix scalarDivide(double x)

Returns the division of this matrix by a scalar.

Parameters:

x - a double.

Returns:

a double matrix.

scalarProduct

public double scalarProduct(AbstractDoubleMatrix m)

Returns the scalar product of this matrix and another.

Parameters:

m - a double matrix.

Throws:

MatrixDimensionException - If the matrices are different sizes.

multiply

public AbstractDoubleVector multiply(AbstractDoubleVector v)

Returns the multiplication of a vector by this matrix.

Parameters:

v - a double vector.

Throws:

DimensionException - If the matrix and vector are incompatible.

multiply

public final Ring.Member multiply(Ring.Member m)

Returns the multiplication of this matrix and another.

Parameters:

m - a ring member

multiply

public AbstractDoubleMatrix multiply(AbstractDoubleMatrix m)

Returns the multiplication of this matrix and another.

Parameters:

m - a double matrix

Returns:

a AbstractDoubleMatrix or a AbstractDoubleSquareMatrix as appropriate

Throws:

MatrixDimensionException - If the matrices are incompatible.

directSum

public AbstractDoubleMatrix directSum(AbstractDoubleMatrix m)

Returns the direct sum of this matrix and another.

tensor

public AbstractDoubleMatrix tensor(AbstractDoubleMatrix m)

Returns the tensor product of this matrix and another.

transpose

public Matrix transpose()

Returns the transpose of this matrix.

Specified by:

transpose in class Matrix

Returns:

a double matrix

mapElements

public AbstractDoubleMatrix mapElements(Mapping f)

Applies a function on all the matrix elements.

Parameters:

f - a user-defined function

Returns:

a double matrix