Package org.jscience.mathematics.vector

Class Float64Matrix

java.lang.Object

org.jscience.mathematics.vector.Matrix<Float64>

org.jscience.mathematics.vector.Float64Matrix

All Implemented Interfaces:

javolution.lang.Immutable, javolution.lang.Realtime, javolution.lang.ValueType, GroupAdditive<Matrix<Float64>>, Ring<Matrix<Float64>>, Structure<Matrix<Float64>>, VectorSpace<Matrix<Float64>,Float64>

public final class Float64Matrix
extends Matrix<Float64>

This class represents an optimized matrix implementation for 64 bits floating-point numbers.

Instances of this class can be created from Float64Vector, either as rows or columns if the matrix is transposed. For example:[code] Float64Vector column0 = Float64Vector.valueOf(...); Float64Vector column1 = Float64Vector.valueOf(...); Float64Matrix M = Float64Matrix.valueOf(column0, column1).transpose(); [/code]

Field Summary

Fields inherited from class org.jscience.mathematics.vector.Matrix

XML

Method Summary

Modifier and Type	Method	Description
Float64Matrix	adjoint()	Returns the adjoint of this matrix.
Float64	cofactor(int i, int j)	Returns the cofactor of an element in this matrix.
Float64Matrix	copy()	Returns a copy of this matrix allocated by the calling thread (possibly on the stack).
Float64	determinant()	Returns the determinant of this matrix.
Float64	get(int i, int j)	Returns a single element from this matrix.
Float64Vector	getColumn(int j)	Returns the column identified by the specified index in this matrix.
Float64Vector	getDiagonal()	Returns the diagonal vector.
int	getNumberOfColumns()	Returns the number of columns n for this matrix.
int	getNumberOfRows()	Returns the number of rows m for this matrix.
Float64Vector	getRow(int i)	Returns the row identified by the specified index in this matrix.
Float64Matrix	inverse()	Returns the inverse of this matrix (must be square).
Float64Matrix	minus(Matrix<Float64> that)	Returns the difference between this matrix and the one specified.
Float64Matrix	opposite()	Returns the negation of this matrix.
Float64Matrix	plus(Matrix<Float64> that)	Returns the sum of this matrix with the one specified.
Float64Matrix	tensor(Matrix<Float64> that)	Returns the linear algebraic matrix tensor product of this matrix and another (Kronecker product).
Float64Matrix	times(Float64 k)	Returns the product of this matrix by the specified factor.
Float64Matrix	times(Matrix<Float64> that)	Returns the product of this matrix with the one specified.
Float64Vector	times(Vector<Float64> v)	Returns the product of this matrix by the specified vector.
Float64Matrix	transpose()	Returns the transpose of this matrix.
static Float64Matrix	valueOf(double[][] values)	Returns a dense matrix from a 2-dimensional array of double values.
static Float64Matrix	valueOf(List<Float64Vector> rows)	Returns a complex matrix holding the row vectors from the specified collection (column vectors if transposed).
static Float64Matrix	valueOf(Float64Vector... rows)	Returns a complex matrix holding the specified row vectors (column vectors if transposed).
static Float64Matrix	valueOf(Matrix<Float64> that)	Returns a complex matrix equivalent to the specified matrix.
Float64Vector	vectorization()	Returns the vectorization of this matrix.

Methods inherited from class org.jscience.mathematics.vector.Matrix

divide, equals, equals, hashCode, isSquare, pow, pseudoInverse, solve, solve, toString, toText, trace

Methods inherited from class java.lang.Object

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

Method Detail

valueOf

public static Float64Matrix valueOf(double[][] values)

Returns a dense matrix from a 2-dimensional array of double values. The first dimension being the row and the second being the column.

Parameters:

values - the array of double values.

Returns:

the matrix having the specified elements.

Throws:

DimensionException - if rows have different length.

See Also:

Float64Vector

valueOf

public static Float64Matrix valueOf(Float64Vector... rows)

Returns a complex matrix holding the specified row vectors (column vectors if transposed).

Parameters:

rows - the row vectors.

Returns:

the matrix having the specified rows.

Throws:

DimensionException - if the rows do not have the same dimension.

valueOf

public static Float64Matrix valueOf(List<Float64Vector> rows)

Returns a complex matrix holding the row vectors from the specified collection (column vectors if transposed).

Parameters:

rows - the list of row vectors.

Returns:

the matrix having the specified rows.

Throws:

DimensionException - if the rows do not have the same dimension.

valueOf

public static Float64Matrix valueOf(Matrix<Float64> that)

Returns a complex matrix equivalent to the specified matrix.

Parameters:

that - the matrix to convert.

Returns:

that or a complex matrix holding the same elements as the specified matrix.

getNumberOfRows

public int getNumberOfRows()

Description copied from class: Matrix

Returns the number of rows m for this matrix.

Specified by:

getNumberOfRows in class Matrix<Float64>

Returns:

m, the number of rows.

getNumberOfColumns

public int getNumberOfColumns()

Description copied from class: Matrix

Returns the number of columns n for this matrix.

Specified by:

getNumberOfColumns in class Matrix<Float64>

Returns:

n, the number of columns.

get

public Float64 get(int i,
                   int j)

Description copied from class: Matrix

Returns a single element from this matrix.

Specified by:

get in class Matrix<Float64>

Parameters:

i - the row index (range [0..m[).

j - the column index (range [0..n[).

Returns:

the element read at [i,j].

getRow

public Float64Vector getRow(int i)

Description copied from class: Matrix

Returns the row identified by the specified index in this matrix.

Specified by:

getRow in class Matrix<Float64>

Parameters:

i - the row index (range [0..m[).

Returns:

the vector holding the specified row.

getColumn

public Float64Vector getColumn(int j)

Description copied from class: Matrix

Returns the column identified by the specified index in this matrix.

Specified by:

getColumn in class Matrix<Float64>

Parameters:

j - the column index (range [0..n[).

Returns:

the vector holding the specified column.

getDiagonal

public Float64Vector getDiagonal()

Description copied from class: Matrix

Returns the diagonal vector.

Specified by:

getDiagonal in class Matrix<Float64>

Returns:

the vector holding the diagonal elements.

opposite

public Float64Matrix opposite()

Description copied from class: Matrix

Returns the negation of this matrix.

Specified by:

opposite in interface GroupAdditive<Matrix<Float64>>

Specified by:

opposite in class Matrix<Float64>

Returns:

-this.

plus

public Float64Matrix plus(Matrix<Float64> that)

Description copied from class: Matrix

Returns the sum of this matrix with the one specified.

Specified by:

plus in interface GroupAdditive<Matrix<Float64>>

Specified by:

plus in class Matrix<Float64>

Parameters:

that - the matrix to be added.

Returns:

this + that.

minus

public Float64Matrix minus(Matrix<Float64> that)

Description copied from class: Matrix

Returns the difference between this matrix and the one specified.

Overrides:

minus in class Matrix<Float64>

Parameters:

that - the matrix to be subtracted.

Returns:

this - that.

times

public Float64Matrix times(Float64 k)

Description copied from class: Matrix

Returns the product of this matrix by the specified factor.

Specified by:

times in interface VectorSpace<Matrix<Float64>,Float64>

Specified by:

times in class Matrix<Float64>

Parameters:

k - the coefficient multiplier.

Returns:

this · k

times

public Float64Vector times(Vector<Float64> v)

Description copied from class: Matrix

Returns the product of this matrix by the specified vector.

Specified by:

times in class Matrix<Float64>

Parameters:

v - the vector.

Returns:

this · v

times

public Float64Matrix times(Matrix<Float64> that)

Description copied from class: Matrix

Returns the product of this matrix with the one specified.

Specified by:

times in interface Ring<Matrix<Float64>>

Specified by:

times in class Matrix<Float64>

Parameters:

that - the matrix multiplier.

Returns:

this · that.

inverse

public Float64Matrix inverse()

Description copied from class: Matrix

Returns the inverse of this matrix (must be square).

Specified by:

inverse in class Matrix<Float64>

Returns:

1 / this

determinant

public Float64 determinant()

Description copied from class: Matrix

Returns the determinant of this matrix.

Specified by:

determinant in class Matrix<Float64>

Returns:

this matrix determinant.

transpose

public Float64Matrix transpose()

Description copied from class: Matrix

Returns the transpose of this matrix.

Specified by:

transpose in class Matrix<Float64>

Returns:

A'.

cofactor

public Float64 cofactor(int i,
                        int j)

Description copied from class: Matrix

Returns the cofactor of an element in this matrix. It is the value obtained by evaluating the determinant formed by the elements not in that particular row or column.

Specified by:

cofactor in class Matrix<Float64>

Parameters:

i - the row index.

j - the column index.

Returns:

the cofactor of THIS[i,j].

adjoint

public Float64Matrix adjoint()

Description copied from class: Matrix

Returns the adjoint of this matrix. It is obtained by replacing each element in this matrix with its cofactor and applying a + or - sign according (-1)**(i+j), and then finding the transpose of the resulting matrix.

Specified by:

adjoint in class Matrix<Float64>

Returns:

the adjoint of this matrix.

tensor

public Float64Matrix tensor(Matrix<Float64> that)

Description copied from class: Matrix

Returns the linear algebraic matrix tensor product of this matrix and another (Kronecker product). The default implementation returns a DenseMatrix.

Specified by:

tensor in class Matrix<Float64>

Parameters:

that - the second matrix.

Returns:

this ⊗ that

See Also:

Wikipedia: Kronecker Product

vectorization

public Float64Vector vectorization()

Description copied from class: Matrix

Returns the vectorization of this matrix. The vectorization of a matrix is the column vector obtain by stacking the columns of the matrix on top of one another. The default implementation returns a DenseVector.

Specified by:

vectorization in class Matrix<Float64>

Returns:

the vectorization of this matrix.

See Also:

Wikipedia: Vectorization.

copy

public Float64Matrix copy()

Description copied from class: Matrix

Returns a copy of this matrix allocated by the calling thread (possibly on the stack).

Specified by:

copy in interface javolution.lang.ValueType

Specified by:

copy in class Matrix<Float64>

Returns:

an identical and independant copy of this matrix.