JSci.maths.matrices
Class DoubleSparseMatrix

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

All Implemented Interfaces:

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

public final class DoubleSparseMatrix

extends AbstractDoubleMatrix

The DoubleSparseMatrix class provides an object for encapsulating sparse matrices. Uses compressed row storage.

See Also:

Serialized Form

Field Summary

Fields inherited from class JSci.maths.matrices.Matrix

numCols, numRows

Constructor Summary

DoubleSparseMatrix(double[][] array)
Constructs a matrix from an array.

DoubleSparseMatrix(int rowCount, int colCount)
Constructs an empty matrix.

Method Summary

AbstractDoubleMatrix	add(AbstractDoubleMatrix m) Returns the addition of this matrix and another.
DoubleMatrix	add(DoubleMatrix m)
DoubleSparseMatrix	add(DoubleSparseMatrix m) Returns the addition of this matrix and another.
boolean	equals(AbstractDoubleMatrix m) Compares two double sparse matrices for equality.
boolean	equals(DoubleSparseMatrix m)
double	frobeniusNorm() Returns the Frobenius (l2) norm.
double	getElement(int i, int j) Returns an element of the 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.
AbstractDoubleMatrix	multiply(DoubleMatrix m)
AbstractDoubleMatrix	multiply(DoubleSparseMatrix m) Returns the multiplication of this matrix and another.
AbstractDoubleMatrix	scalarDivide(double x) Returns the division of this matrix by a scalar.
AbstractDoubleMatrix	scalarMultiply(double x) Returns the multiplication of this matrix by a scalar.
double	scalarProduct(AbstractDoubleMatrix m) Returns the scalar product of this matrix and another.
double	scalarProduct(DoubleMatrix m)
void	setElement(int i, int j, double x) Sets the value of an element of the matrix.
AbstractDoubleMatrix	subtract(AbstractDoubleMatrix m) Returns the subtraction of this matrix and another.
DoubleMatrix	subtract(DoubleMatrix m)
DoubleSparseMatrix	subtract(DoubleSparseMatrix m) Returns the addition 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.AbstractDoubleMatrix

add, directSum, equals, hashCode, multiply, negate, scalarDivide, scalarMultiply, subtract, tensor

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

DoubleSparseMatrix

public DoubleSparseMatrix(int rowCount,
                          int colCount)

Constructs an empty matrix.

Parameters:

rowCount - the number of rows

colCount - the number of columns

DoubleSparseMatrix

public DoubleSparseMatrix(double[][] array)

Constructs a matrix from an array.

Parameters:

array - an assigned value

Method Detail

equals

public boolean equals(AbstractDoubleMatrix m)

Compares two double sparse matrices for equality.

Overrides:

equals in class AbstractDoubleMatrix

Parameters:

m - a double matrix

equals

public boolean equals(DoubleSparseMatrix m)

toString

public java.lang.String toString()

Returns a string representing this matrix.

Overrides:

toString in class AbstractDoubleMatrix

toIntegerMatrix

public AbstractIntegerMatrix toIntegerMatrix()

Converts this matrix to an integer matrix.

Overrides:

toIntegerMatrix in class AbstractDoubleMatrix

Returns:

an integer matrix

toComplexMatrix

public AbstractComplexMatrix toComplexMatrix()

Converts this matrix to a complex matrix.

Overrides:

toComplexMatrix in class AbstractDoubleMatrix

Returns:

a complex matrix

getElement

public double getElement(int i,
                         int j)

Returns an element of the matrix.

Specified by:

getElement in class AbstractDoubleMatrix

Parameters:

i - row index of the element

j - column index of the element

Throws:

MatrixDimensionException - If attempting to access an invalid element.

setElement

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

Sets the value of an element of the matrix.

Specified by:

setElement in class AbstractDoubleMatrix

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.

Overrides:

infNorm in class AbstractDoubleMatrix

frobeniusNorm

public double frobeniusNorm()

Returns the Frobenius (l²) norm.

Overrides:

frobeniusNorm in class AbstractDoubleMatrix

add

public AbstractDoubleMatrix add(AbstractDoubleMatrix m)

Returns the addition of this matrix and another.

Overrides:

add in class AbstractDoubleMatrix

Parameters:

m - a double matrix

Throws:

MatrixDimensionException - If the matrices are different sizes.

add

public DoubleMatrix add(DoubleMatrix m)

add

public DoubleSparseMatrix add(DoubleSparseMatrix m)

Returns the addition of this matrix and another.

Parameters:

m - a double sparse matrix

Throws:

MatrixDimensionException - If the matrices are different sizes.

subtract

public AbstractDoubleMatrix subtract(AbstractDoubleMatrix m)

Returns the subtraction of this matrix and another.

Overrides:

subtract in class AbstractDoubleMatrix

Parameters:

m - a double matrix

Throws:

MatrixDimensionException - If the matrices are different sizes.

subtract

public DoubleMatrix subtract(DoubleMatrix m)

subtract

public DoubleSparseMatrix subtract(DoubleSparseMatrix m)

Returns the addition of this matrix and another.

Parameters:

m - a double sparse matrix

Throws:

MatrixDimensionException - If the matrices are different sizes.

scalarMultiply

public AbstractDoubleMatrix scalarMultiply(double x)

Returns the multiplication of this matrix by a scalar.

Overrides:

scalarMultiply in class AbstractDoubleMatrix

Parameters:

x - a double

Returns:

a double sparse matrix

scalarDivide

public AbstractDoubleMatrix scalarDivide(double x)

Description copied from class: AbstractDoubleMatrix

Returns the division of this matrix by a scalar.

Overrides:

scalarDivide in class AbstractDoubleMatrix

Parameters:

x - a double.

Returns:

a double matrix.

scalarProduct

public double scalarProduct(AbstractDoubleMatrix m)

Returns the scalar product of this matrix and another.

Overrides:

scalarProduct in class AbstractDoubleMatrix

Parameters:

m - a double matrix.

Throws:

MatrixDimensionException - If the matrices are different sizes.

scalarProduct

public double scalarProduct(DoubleMatrix m)

multiply

public AbstractDoubleVector multiply(AbstractDoubleVector v)

Returns the multiplication of a vector by this matrix.

Overrides:

multiply in class AbstractDoubleMatrix

Parameters:

v - a double vector

Throws:

DimensionException - If the matrix and vector are incompatible.

multiply

public AbstractDoubleMatrix multiply(AbstractDoubleMatrix m)

Returns the multiplication of this matrix and another.

Overrides:

multiply in class AbstractDoubleMatrix

Parameters:

m - a double matrix

Returns:

a AbstractDoubleMatrix or a AbstractDoubleSquareMatrix as appropriate

Throws:

MatrixDimensionException - If the matrices are incompatible.

multiply

public AbstractDoubleMatrix multiply(DoubleMatrix m)

multiply

public AbstractDoubleMatrix multiply(DoubleSparseMatrix m)

Returns the multiplication of this matrix and another.

Parameters:

m - a double sparse matrix

Throws:

MatrixDimensionException - If the matrices are incompatible.

transpose

public Matrix transpose()

Returns the transpose of this matrix.

Overrides:

transpose in class AbstractDoubleMatrix

Returns:

a double sparse matrix

mapElements

public AbstractDoubleMatrix mapElements(Mapping f)

Applies a function on all the matrix elements.

Overrides:

mapElements in class AbstractDoubleMatrix

Parameters:

f - a user-defined function

Returns:

a double sparse matrix