Package com.powsybl.math.matrix

Class DenseMatrix

java.lang.Object

com.powsybl.math.matrix.AbstractMatrix

com.powsybl.math.matrix.DenseMatrix

All Implemented Interfaces:

Matrix

public class DenseMatrix
extends AbstractMatrix

Dense matrix implementation based on an array of rowCount * columnCount double values.

Author:

Geoffroy Jamgotchian

Nested Class Summary

Nested classes/interfaces inherited from interface com.powsybl.math.matrix.Matrix

Matrix.Element, Matrix.ElementHandler

Constructor Summary

Constructors

Constructor	Description
DenseMatrix(int rowCount, int columnCount)
DenseMatrix(int rowCount, int columnCount, double[] values)
DenseMatrix(int rowCount, int columnCount, Supplier<ByteBuffer> bufferSupplier)
DenseMatrix(Jama.Matrix matrix)

Method Summary

Modifier and Type	Method	Description
void	add(int i, int j, double value)	Add value at row i and column j.
Matrix.Element	addAndGetElement(int i, int j, double value)	Add value at row i and column j and get an #Element to later update the element.
LUDecomposition	decomposeLU()	Get LU decomposition utility class for this matrix.
boolean	equals(Object obj)
double	get(int i, int j)	Get value at row i and column j.
int	getColumnCount()	Get column count.
protected int	getEstimatedNonZeroValueCount()	Get an estimation of non zero value count.
int	getRowCount()	Get row count.
double	getValue(int i, int j)	Deprecated. Use get(int, int) instead.
int	hashCode()
void	iterateNonZeroValue(Matrix.ElementHandler handler)	Iterate over non zero values of the matrix.
void	iterateNonZeroValueOfColumn(int j, Matrix.ElementHandler handler)	Iterate over non zero values of the j column of the matrix.
void	print(PrintStream out)	Print the matrix to a stream.
void	print(PrintStream out, List<String> rowNames, List<String> columnNames)	Print the matrix to a stream.
void	reset()	Fill matrix with zeros.
void	set(int i, int j, double value)	Set value at row i and column j.
Matrix	times(Matrix other)	Multiply the matrix by another one (this*other).
Matrix	to(MatrixFactory factory)	Copy this matrix using another implementation.
DenseMatrix	toDense()	Copy this matrix using a dense implementation.
com.powsybl.math.matrix.SparseMatrix	toSparse()	Copy this matrix using a sparse implementation.

Methods inherited from class com.powsybl.math.matrix.AbstractMatrix

checkBounds, copy

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.powsybl.math.matrix.Matrix

addValue, getM, getN, setValue

Constructor Detail

DenseMatrix

public DenseMatrix(int rowCount,
                   int columnCount,
                   double[] values)

DenseMatrix

public DenseMatrix(int rowCount,
                   int columnCount)

DenseMatrix

public DenseMatrix(int rowCount,
                   int columnCount,
                   Supplier<ByteBuffer> bufferSupplier)

DenseMatrix

public DenseMatrix(Jama.Matrix matrix)

Method Detail

get

public double get(int i,
                  int j)

Get value at row i and column j.

Parameters:

i - row index

j - column index

Returns:

value at row i and column j

getValue

@Deprecated
public double getValue(int i,
                       int j)

Deprecated.

Use get(int, int) instead.

set

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

Description copied from interface: Matrix

Set value at row i and column j.

Parameters:

i - row index

j - column index

value - the value to set at row i and column j

add

public void add(int i,
                int j,
                double value)

Description copied from interface: Matrix

Add value at row i and column j.

Parameters:

i - row index

j - column index

value - the value to add at row i and column j

addAndGetElement

public Matrix.Element addAndGetElement(int i,
                                       int j,
                                       double value)

Description copied from interface: Matrix

Add value at row i and column j and get an #Element to later update the element.

Parameters:

i - row index

j - column index

value - the value to add at row i and column j

Returns:

an element at row i and column j

reset

public void reset()

Description copied from interface: Matrix

Fill matrix with zeros.

getRowCount

public int getRowCount()

Description copied from interface: Matrix

Get row count.

Returns:

row count

getColumnCount

public int getColumnCount()

Description copied from interface: Matrix

Get column count.

Returns:

column count

decomposeLU

public LUDecomposition decomposeLU()

Description copied from interface: Matrix

Get LU decomposition utility class for this matrix.

Returns:

LU decomposition utility class for this matrix

times

public Matrix times(Matrix other)

Description copied from interface: Matrix

Multiply the matrix by another one (this*other).

Parameters:

other - the other matrix

Returns:

the result of the multiplication of this matrix by the other one

iterateNonZeroValue

public void iterateNonZeroValue(Matrix.ElementHandler handler)

Description copied from interface: Matrix

Iterate over non zero values of the matrix. At each non zero value Matrix.ElementHandler.onElement(int, int, double) is called.

Parameters:

handler - the element handler

iterateNonZeroValueOfColumn

public void iterateNonZeroValueOfColumn(int j,
                                        Matrix.ElementHandler handler)

Description copied from interface: Matrix

Iterate over non zero values of the j column of the matrix. At each non zero value Matrix.ElementHandler.onElement(int, int, double) is called.

Parameters:

j - column index

handler - the element handler

toDense

public DenseMatrix toDense()

Description copied from interface: Matrix

Copy this matrix using a dense implementation. If already a dense matrix, this method is allowed to return this.

Returns:

a copy of the matrix with a dense implementation.

toSparse

public com.powsybl.math.matrix.SparseMatrix toSparse()

Description copied from interface: Matrix

Copy this matrix using a sparse implementation. If already a sparse matrix, this method is allowed to return this.

Returns:

a copy of the matrix with a sparse implementation.

to

public Matrix to(MatrixFactory factory)

Description copied from interface: Matrix

Copy this matrix using another implementation. If already with the right implementation, this method is allowed to return this.

Parameters:

factory - a matrix factory to create the copy.

Returns:

a copy of the matrix

getEstimatedNonZeroValueCount

protected int getEstimatedNonZeroValueCount()

Description copied from class: AbstractMatrix

Get an estimation of non zero value count.

Specified by:

getEstimatedNonZeroValueCount in class AbstractMatrix

Returns:

an estimation of non zero value count

print

public void print(PrintStream out)

Description copied from interface: Matrix

Print the matrix to a stream.

Parameters:

out - the stream

print

public void print(PrintStream out,
                  List<String> rowNames,
                  List<String> columnNames)

Description copied from interface: Matrix

Print the matrix to a stream. Row and column names are also printed to facilitate debugging.

Parameters:

out - the stream

rowNames - row names

columnNames - column names

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object