ch.akuhn.matrix

Class SymmetricMatrix

java.lang.Object

ch.akuhn.matrix.Matrix

ch.akuhn.matrix.DenseMatrix

ch.akuhn.matrix.SymmetricMatrix

public class SymmetricMatrix
extends DenseMatrix

Matrix where aij = aji for all elements.

Author:

Adrian Kuhn

Field Summary

Fields inherited from class ch.akuhn.matrix.DenseMatrix

values

Constructor Summary

Constructors

Constructor and Description
SymmetricMatrix(double[][] values) Construct with given values, which must be jagged and represent the lower triangular values
SymmetricMatrix(int size) Construct with given size

Method Summary

Modifier and Type	Method and Description
protected void	assertInvariant()
int	columnCount() Get the number of columns
static DenseMatrix	fromJagged(double[][] values) Create from jagged low triangular values
static DenseMatrix	fromSquare(double[][] square) Create from a square matrix
double	get(int row, int column)
protected double[][]	makeValues(int rows, int columns)
Vector	mult(Vector v) Returns y = Ax.
double	put(int row, int column, double value) Set the value at the given row/column
int	rowCount()
double[]	rowwiseMean()
double[][]	unwrap()

Methods inherited from class ch.akuhn.matrix.DenseMatrix

add, applyMultiplication, fill, newInstance, rows, used

Methods inherited from class ch.akuhn.matrix.Matrix

asArray, asColumnMajorArray, column, columns, dense, density, elementCount, from, getHistogram, indexOf, isSquare, max, mean, min, newInstance, row, sparse, storeSparseOn, storeSparseOn, toString, transposeMultiply, transposeNonTransposeMultiply

Methods inherited from class java.lang.Object

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

Constructor Detail

SymmetricMatrix

public SymmetricMatrix(int size)

Construct with given size

Parameters:

size -

SymmetricMatrix

public SymmetricMatrix(double[][] values)

Construct with given values, which must be jagged and represent the lower triangular values

Parameters:

values -

Method Detail

assertInvariant

protected void assertInvariant()
                        throws IllegalArgumentException

Overrides:

assertInvariant in class DenseMatrix

Throws:

IllegalArgumentException

makeValues

protected double[][] makeValues(int rows,
                                int columns)

Overrides:

makeValues in class DenseMatrix

columnCount

public int columnCount()

Description copied from class: Matrix

Get the number of columns

Overrides:

columnCount in class DenseMatrix

Returns:

the number of columns

get

public double get(int row,
                  int column)

Overrides:

get in class DenseMatrix

Returns:

the value at the given row and column

put

public double put(int row,
                  int column,
                  double value)

Description copied from class: Matrix

Set the value at the given row/column

Overrides:

put in class DenseMatrix

Returns:

the value being set

rowCount

public int rowCount()

Overrides:

rowCount in class DenseMatrix

Returns:

the number of rows

fromSquare

public static DenseMatrix fromSquare(double[][] square)

Create from a square matrix

Parameters:

square -

Returns:

the matrix

fromJagged

public static DenseMatrix fromJagged(double[][] values)

Create from jagged low triangular values

Parameters:

values -

Returns:

the matrix

unwrap

public double[][] unwrap()

Overrides:

unwrap in class DenseMatrix

Returns:

unwrapped matrix

rowwiseMean

public double[] rowwiseMean()

Overrides:

rowwiseMean in class Matrix

Returns:

mean of each row

mult

public Vector mult(Vector v)

Description copied from class: Matrix

Returns y = Ax.

Overrides:

mult in class Matrix

Returns:

the result