Package org.djunits.vecmat.d2

Class AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>

java.lang.Object

org.djunits.vecmat.def.AbsVectorMatrix<A,Q,MA,MQ,MAT>

org.djunits.vecmat.def.AbsTable<A,Q,MA,MQ,MAT>

org.djunits.vecmat.def.AbsMatrix<A,Q,MA,MQ,MA>

org.djunits.vecmat.def.AbsSquareMatrix<A,Q,AbsMatrix2x2<A,Q>,Matrix2x2<Q>>

org.djunits.vecmat.d2.AbsMatrix2x2<A,Q>

Type Parameters:

A - the absolute quantity type

Q - the corresponding relative quantity type

All Implemented Interfaces:

Serializable, Value<AbsMatrix2x2<A,Q>,Q>

public class AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>
extends AbsSquareMatrix<A,Q,AbsMatrix2x2<A,Q>,Matrix2x2<Q>>

AbsMatrix2x2 implements a matrix with 2x2 absolute quantities with a reference point. The matrix is immutable, except for the display unit, which can be changed.

Copyright (c) 2026-2026 Delft University of Technology, Jaffalaan 5, 2628 BX Delft, the Netherlands. All rights reserved. See for project information https://djunits.org. The DJUNITS project is distributed under a three-clause BSD-style license.

Author:

Alexander Verbraeck

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
AbsMatrix2x2(Matrix2x2<Q> relativeMatrix, Reference<?,A,Q> reference)	Create a new AbsMatrix2x2 with a display unit and a reference point.

Method Summary

Modifier and Type	Method	Description
AbsVector2.Col<A,Q>	getColumnVector(int col)	Return a quantity column (0-based) from the vector or matrix.
AbsVector2.Col<A,Q>	getDiagonalVector()	Retrieve the main diagonal of the matrix as a column vector.
AbsVector2.Row<A,Q>	getRowVector(int row)	Return a quantity row (0-based) from the vector or matrix.
AbsMatrix2x2<A,Q>	instantiate(Matrix2x2<Q> relativeMatrix, Reference<?,A,Q> reference)	Return a new vector or matrix with the given SI or BASE values for the relative vector or matrix.
AbsVector2.Col<A,Q>	mgetColumnVector(int mCol)	Return a quantity column (1-based) from the vector or matrix.
AbsVector2.Row<A,Q>	mgetRowVector(int mRow)	Return a quantity row (1-based) from the vector or matrix.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(double[][] gridInUnit, Unit<?,Q> unit, R reference)	Create an AbsMatrix2x2 with a unit, based on a 2-dimensional grid.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(double[] dataInUnit, Unit<?,Q> unit, R reference)	Create an AbsMatrix2x2 without needing generics.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(A[] absData)	Create an AbsMatrix2x2 without needing generics.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(A[][] absGrid)	Create an AbsMatrix2x2 without needing generics.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(Matrix2x2<Q> relativeMatrix, R reference)	Create an AbsMatrix2x2 without needing generics.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(Q[][] grid, R reference)	Create an AbsMatrix2x2 without needing generics.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	of(Q[] data, R reference)	Create an AbsMatrix2x2 without needing generics.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	ofSi(double[][] gridSi, Unit<?,Q> displayUnit, R reference)	Create an AbsMatrix2x2 with a unit, based on a 2-dimensional grid with SI-values.
static <A extends AbsQuantity<A, Q, R>, Q extends Quantity<Q>, R extends Reference<R, A, Q>> AbsMatrix2x2<A,Q>	ofSi(double[] dataSi, Unit<?,Q> displayUnit, R reference)	Create an AbsMatrix2x2 without needing generics.

Methods inherited from class org.djunits.vecmat.def.AbsSquareMatrix

getDiagonalScalars, getDiagonalSi, isSkewSymmetric, isSkewSymmetric, isSymmetric, isSymmetric, order, transpose

Methods inherited from class org.djunits.vecmat.def.AbsMatrix

format, format, format

Methods inherited from class org.djunits.vecmat.def.AbsTable

get, getColumnScalars, getColumnSi, getRowScalars, getRowSi, getScalarArray, getScalarGrid, getSiArray, getSiGrid, mget, mgetColumnScalars, mgetColumnSi, mgetRowScalars, mgetRowSi, msi, si

Methods inherited from class org.djunits.vecmat.def.AbsVectorMatrix

add, add, asAbsMatrix1x1, asAbsMatrix2x2, asAbsMatrix3x3, asAbsMatrixNxM, asAbsMatrixNxN, asAbsQuantityTable, asAbsVector1, asAbsVector2Col, asAbsVector2Row, asAbsVector3Col, asAbsVector3Row, asAbsVectorNCol, asAbsVectorNRow, checkCol, checkRow, cols, equals, getDisplayUnit, getReference, getRelativeVecMat, hashCode, instantiateSi, isRelative, max, mcheckCol, mcheckRow, median, min, rows, setDisplayUnit, subtract, subtract, subtract, subtract, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.djunits.value.Value

isAbsolute, setDisplayUnit

Constructor Details

AbsMatrix2x2

public AbsMatrix2x2(Matrix2x2<Q> relativeMatrix,
 Reference<?,A,Q> reference)

Create a new AbsMatrix2x2 with a display unit and a reference point.

Parameters:

relativeMatrix - the matrix values {a11} expressed in the displayUnit

reference - the reference point for the absolute values

Method Details

instantiate

public AbsMatrix2x2<A,Q> instantiate(Matrix2x2<Q> relativeMatrix,
 Reference<?,A,Q> reference)

Description copied from class: AbsVectorMatrix

Return a new vector or matrix with the given SI or BASE values for the relative vector or matrix.

Specified by:

instantiate in class AbsVectorMatrix<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>,Matrix2x2<Q extends Quantity<Q>>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>>

Parameters:

relativeMatrix - the underlying relative vector or matrix with SI values relative to the reference point

reference - the reference point for the relative SI values

Returns:

a new matrix with the provided SI or BASE values

getRowVector

public AbsVector2.Row<A,Q> getRowVector(int row)

Description copied from class: AbsTable

Return a quantity row (0-based) from the vector or matrix. Note that the specific vector to return can be tightened by the implementing class.

Specified by:

getRowVector in class AbsTable<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>,Matrix2x2<Q extends Quantity<Q>>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>>

Parameters:

row - the row number to retrieve (0-based)

Returns:

a row vector with the data at the given row

mgetRowVector

public AbsVector2.Row<A,Q> mgetRowVector(int mRow)

Description copied from class: AbsTable

Return a quantity row (1-based) from the vector or matrix. Note that the specific vector to return can be tightened by the implementing class.

Specified by:

mgetRowVector in class AbsTable<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>,Matrix2x2<Q extends Quantity<Q>>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>>

Parameters:

mRow - the row number to retrieve (1-based)

Returns:

a row vector with the data at the given row

getColumnVector

public AbsVector2.Col<A,Q> getColumnVector(int col)

Description copied from class: AbsTable

Return a quantity column (0-based) from the vector or matrix. Note that the specific vector to return can be tightened by the implementing class.

Specified by:

getColumnVector in class AbsTable<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>,Matrix2x2<Q extends Quantity<Q>>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>>

Parameters:

col - the column number to retrieve (0-based)

Returns:

a column vector with the data at the given column

mgetColumnVector

public AbsVector2.Col<A,Q> mgetColumnVector(int mCol)

Description copied from class: AbsTable

Return a quantity column (1-based) from the vector or matrix. Note that the specific vector to return can be tightened by the implementing class.

Specified by:

mgetColumnVector in class AbsTable<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>,Matrix2x2<Q extends Quantity<Q>>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>>

Parameters:

mCol - the column number to retrieve (1-based)

Returns:

a column vector with the data at the given column

getDiagonalVector

public AbsVector2.Col<A,Q> getDiagonalVector()

Description copied from class: AbsSquareMatrix

Retrieve the main diagonal of the matrix as a column vector.

Specified by:

getDiagonalVector in class AbsSquareMatrix<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>,AbsMatrix2x2<A extends AbsQuantity<A,Q,?>,Q extends Quantity<Q>>,Matrix2x2<Q extends Quantity<Q>>>

Returns:

the main diagonal as a Vector

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(double[] dataInUnit,
 Unit<?,Q> unit,
 R reference)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

dataInUnit - the matrix values {a11, a12, a21, a22} expressed as an array in the display unit

unit - the unit of the data, which will also be used as the display unit

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit

ofSi

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> ofSi(double[] dataSi,
 Unit<?,Q> displayUnit,
 R reference)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

dataSi - the matrix values {a11, a12, a21, a22} expressed as an array in the SI units

displayUnit - the display unit to use

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(Q[] data,
 R reference)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

data - the matrix values {a11, a12, a21, a22} expressed as an array of quantities

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(A[] absData)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

absData - the {a11, a12, a21, a22} values expressed as an array of absolute quantities

Returns:

a new Matrix2x2 with a unit

ofSi

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> ofSi(double[][] gridSi,
 Unit<?,Q> displayUnit,
 R reference)

Create an AbsMatrix2x2 with a unit, based on a 2-dimensional grid with SI-values.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

gridSi - the matrix values {{a11, a12}, {a21, a22}} expressed in the SI or base unit

displayUnit - the unit of the data, which will also be used as the display unit

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(double[][] gridInUnit,
 Unit<?,Q> unit,
 R reference)

Create an AbsMatrix2x2 with a unit, based on a 2-dimensional grid.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

gridInUnit - the matrix values {{a11, a12}, {a21, a22}} expressed in the unit

unit - the unit of the data, which will also be used as the display unit

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(Q[][] grid,
 R reference)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

grid - the matrix values {{a11, a12}, {a21, a22}} expressed as an array of quantities

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(A[][] absGrid)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

absGrid - the {{a11, a12}, {a21, a22}} values expressed as an grid [][] of absolute quantities

Returns:

a new Matrix2x2 with a unit

of

public static <A extends AbsQuantity<A,
Q,
R>,
Q extends Quantity<Q>,
R extends Reference<R,
A,
Q>>
AbsMatrix2x2<A,Q> of(Matrix2x2<Q> relativeMatrix,
 R reference)

Create an AbsMatrix2x2 without needing generics.

Type Parameters:

A - the absolute quantity type

Q - the quantity type

R - the reference type

Parameters:

relativeMatrix - the relative matrix with values relative to the reference point

reference - the reference point for the absolute quantities

Returns:

a new Matrix2x2 with a unit