agi.foundation.coordinates

(agi.foundation.core-2025r1.jar)

Class DenseMatrix

java.lang.Object

agi.foundation.infrastructure.DefinitionalObject

agi.foundation.coordinates.Matrix

agi.foundation.coordinates.DenseMatrix

All Implemented Interfaces:

ICloneWithContext, IEnumerateDependencies, IEquatableDefinition, IEquatableEpsilon<Matrix>, IFreezable

public class DenseMatrix
extends Matrix

A general implementation of Matrix with no restrictions on element values.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DenseMatrix(DenseMatrix existingInstance, CopyContext context) Initializes a new instance as a copy of an existing instance.
	DenseMatrix(double[][] array) Initializes a new instance from a two-dimensional array of values.
	DenseMatrix(double[][] array, int rowDimension, int columnDimension) Construct a matrix without copying the given array.
	DenseMatrix(double[] elements, int rowDimension) Initializes a new instance from a one-dimensional packed array.
	DenseMatrix(int rowDimension, int columnDimension) Initializes a new instance with the specified row and column dimensions.
	DenseMatrix(int rowDimension, int columnDimension, double elementValue) Initializes a new instance with the specified row and column dimensions.
	DenseMatrix(Matrix matrix) Initializes a new DenseMatrix from an existing Matrix.
	DenseMatrix(Matrix3By3 matrix) Initializes a new instance from an existing Matrix3By3.
	DenseMatrix(Matrix6By6 matrix) Initializes a new instance from an existing Matrix6By6.

Method Summary

Modifier and Type	Method and Description
protected boolean	checkForSameDefinition(DenseMatrix other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
protected boolean	checkForSameDefinition(Matrix other) Checks to determine if another instance has the same definition as this instance and returns true if it does.
void	clear() Sets the value of every value in the matrix to zero.
Object	clone(CopyContext context) Clones this object using the specified context.
protected int	computeCurrentDefinitionHashCode() Computes a hash code based on the current properties of this object.
boolean	equals(Object obj) Indicates whether another object is exactly equal to this instance.
double	get(int rowIndex, int columnIndex) Gets the value at the specified location in the matrix.
int	hashCode() Returns a hash code for this instance, which is suitable for use in hashing algorithms and data structures like a hash table.
static DenseMatrix	identity(int rowDimension, int columnDimension) Generates an identity matrix.
static double[]	multiply(DenseMatrix matrix, double[] vector) Returns the result of the multiplication of a matrix and a vector.
Matrix	multiply(double factor) Creates a new Matrix which has the value of the current matrix multiplied by the given factor.
double[]	multiply(double[] vector) Returns the result of the multiplication of this matrix and a vector.
DenseMatrix	multiplyAssign(double s) Multiply a matrix by a scalar in place, A = s*A
void	set(int rowIndex, int columnIndex, double value) Sets the value at the specified location in the matrix.
double[]	solve(double[] vectorB) Solve A*X = B
Matrix	transpose() Creates a new Matrix which is the transpose of the current matrix.

Methods inherited from class agi.foundation.coordinates.Matrix

add, add, add, add, add, addAssign, checkForSameDefinition, elementDivide, elementDivide, elementDivide, elementDivide, elementDivide, elementDivideAssign, elementMultiply, elementMultiply, elementMultiply, elementMultiply, elementMultiply, elementMultiplyAssign, equals, equalsEpsilon, getColumnDimension, getFrozenCopy, getMatrix, getMatrix, getMatrix, getMatrix, getMatrix, getMatrix, getMatrix, getMatrix, getRowDimension, multiply, multiply, multiply, multiply, multiply, multiply, multiply, multiplyAssign, setMatrix, setMatrix, setMatrix, setMatrix, setMatrix, subtract, subtract, subtract, subtract, subtract, subtractAssign, toString

Methods inherited from class agi.foundation.infrastructure.DefinitionalObject

areSameDefinition, areSameDefinition, areSameDefinition, areSameDefinition, areSameDefinition, collectionItemsAreSameDefinition, collectionItemsAreSameDefinition, collectionItemsAreSameDefinition, dictionaryItemsAreSameDefinition, enumerateDependencies, freeze, freezeAggregatedObjects, getCollectionHashCode, getCollectionHashCode, getCollectionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDefinitionHashCode, getDictionaryHashCode, getIsFrozen, isSameDefinition, throwIfFrozen

Methods inherited from class java.lang.Object

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

Constructor Detail

DenseMatrix

public DenseMatrix(int rowDimension,
                   int columnDimension)

Initializes a new instance with the specified row and column dimensions. All elements of the matrix will default to zero.

Parameters:

rowDimension - The number of rows in the matrix.

columnDimension - The number of columns in the matrix.

Throws:

ArgumentOutOfRangeException - Thrown when rowDimension or columnDimension are less than zero.

DenseMatrix

public DenseMatrix(int rowDimension,
                   int columnDimension,
                   double elementValue)

Initializes a new instance with the specified row and column dimensions. All elements of the matrix will be set to the provided value.

Parameters:

rowDimension - The number of rows in the matrix.

columnDimension - The number of columns in the matrix.

elementValue - The value that all elements in the matrix will be set to.

Throws:

ArgumentOutOfRangeException - Thrown when rowDimension or columnDimension are less than zero.

DenseMatrix

public DenseMatrix(@Nonnull
                   double[][] array)

Initializes a new instance from a two-dimensional array of values.

Parameters:

array - A two-dimensional array of doubles.

Throws:

IllegalStateException - Thrown when all rows are not the same length.

ArgumentNullException - Thrown when array is null.

DenseMatrix

public DenseMatrix(@Nonnull
                   double[][] array,
                   int rowDimension,
                   int columnDimension)

Construct a matrix without copying the given array.

Parameters:

array - Rectangular two-dimensional array of doubles.

rowDimension - Number of rows, this must match the first dimension of the given array.

columnDimension - Number of columns, this must match the second dimensions of the given array.

Throws:

ArgumentNullException - Thrown when array is null.

ArgumentOutOfRangeException - Thrown when rowDimension or columnDimension are less than zero.

DenseMatrix

public DenseMatrix(@Nonnull
                   double[] elements,
                   int rowDimension)

Initializes a new instance from a one-dimensional packed array.

Parameters:

elements - A one-dimensional array of doubles containing the values of all of the elements.

rowDimension - The number of rows in the matrix.

Throws:

ArgumentOutOfRangeException - Thrown when rowDimension is less than zero.

ArgumentException - Thrown when the length of elements is not a multiple of the column dimension.

ArgumentNullException - Thrown when elements is null.

DenseMatrix

public DenseMatrix(@Nonnull
                   Matrix3By3 matrix)

Initializes a new instance from an existing Matrix3By3.

Parameters:

matrix - The existing Matrix3By3 to copy.

DenseMatrix

public DenseMatrix(@Nonnull
                   Matrix6By6 matrix)

Initializes a new instance from an existing Matrix6By6.

Parameters:

matrix - The existing Matrix6By6 to copy.

Throws:

ArgumentNullException - Thrown when matrix is null.

DenseMatrix

public DenseMatrix(@Nonnull
                   Matrix matrix)

Initializes a new DenseMatrix from an existing Matrix.

Parameters:

matrix - The existing Matrix to copy.

Throws:

ArgumentNullException - Thrown when matrix is null.

DenseMatrix

protected DenseMatrix(@Nonnull
                      DenseMatrix existingInstance,
                      @Nonnull
                      CopyContext context)

Initializes a new instance as a copy of an existing instance.

See ICloneWithContext.clone(CopyContext) for more information about how to implement this constructor in a derived class.

Parameters:

existingInstance - The existing instance to copy.

context - A CopyContext that controls the depth of the copy.

Throws:

ArgumentNullException - Thrown when existingInstance or context is null.

Method Detail

clone

public Object clone(CopyContext context)

Clones this object using the specified context.

This method should be implemented to call a copy constructor on the class of the object being cloned. The copy constructor should take the CopyContext as a parameter in addition to the existing instance to copy. The copy constructor should first call CopyContext.addObjectMapping(T, T) to identify the newly constructed instance as a copy of the existing instance. It should then copy all fields, using CopyContext.updateReference(T) to copy any reference fields.

A typical implementation of ICloneWithContext:

public static class MyClass implements ICloneWithContext {
    public MyClass(MyClass existingInstance, CopyContext context) {
        context.addObjectMapping(existingInstance, this);
        someReference = context.updateReference(existingInstance.someReference);
    }

    @Override
    public final Object clone(CopyContext context) {
        return new MyClass(this, context);
    }

    private Object someReference;
}

In general, all fields that are reference types should be copied with a call to CopyContext.updateReference(T). There are a couple of exceptions:

1. Fields that are aggregate parts of the object should always be copied. A referenced object is an aggregate if properties or methods on the object being copied can modify the externally-visible value of the referenced object.
2. If the semantics of the referenced object require that it have a single parent, owner, context, etc., and the object being copied is that parent, owner, or context, then the referenced object should always be copied.

If one of these exceptions applies, the CopyContext should be given an opportunity to update the reference before the reference is copied explicitly. Use CopyContext.updateReference(T) to update the reference. If CopyContext.updateReference(T) returns the original object, indicating that the context does not have a replacement registered, then copy the object manually by invoking a Clone method, a copy constructor, or by manually constructing a new instance and copying the values.

alwaysCopy = context.updateReference(existingInstance.alwaysCopy);
if (existingInstance.alwaysCopy != null && alwaysCopy == existingInstance.alwaysCopy) {
    alwaysCopy = (AlwaysCopy) existingInstance.alwaysCopy.clone(context);
}

If you are implementing an evaluator (a class that implements IEvaluator), the IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) method shares some responsibilities with the copy context constructor. Code duplication can be avoided by doing the following:

1. For references to other evaluators ONLY, simply assign the reference in the constructor instead of calling CopyContext.updateReference(T). You should still call CopyContext.updateReference(T) on any references to non-evaluators.
2. Call IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) as the last line in the constructor and pass it the same CopyContext passed to the constructor.
3. Implement IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) as normal. See the reference documentation for IEvaluator.updateEvaluatorReferences(agi.foundation.infrastructure.CopyContext) for more information on implementing that method.

public MyClass(MyClass existingInstance, CopyContext context) {
    super(existingInstance, context);
    someReference = context.updateReference(existingInstance.someReference);
    evaluatorReference = existingInstance.evaluatorReference;
    updateEvaluatorReferences(context);
}

@Override
public void updateEvaluatorReferences(CopyContext context) {
    evaluatorReference = context.updateReference(evaluatorReference);
}

@Override
public Object clone(CopyContext context) {
    return new MyClass(this, context);
}

private Object someReference;
private IEvaluator evaluatorReference;

Specified by:

clone in interface ICloneWithContext

Specified by:

clone in class DefinitionalObject

Parameters:

context - The context to use to perform the copy.

Returns:

A new instance which is a copy of this object.

checkForSameDefinition

protected final boolean checkForSameDefinition(Matrix other)

Checks to determine if another instance has the same definition as this instance and returns true if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return false for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IEquatableDefinition.isSameDefinition(java.lang.Object).

Specified by:

checkForSameDefinition in class Matrix

Parameters:

other - The other instance to compare to this one.

Returns:

true if the two objects are defined equivalently; otherwise false.

checkForSameDefinition

protected boolean checkForSameDefinition(DenseMatrix other)

Checks to determine if another instance has the same definition as this instance and returns true if it does. Derived classes MUST override this method and check all new fields introduced by the derived class for definitional equivalence. It is NOT necessary to check base class fields because the base class will already have done that. When overriding this method, you should NOT call the base implementation because it will return false for all derived-class instances. Derived classes should check the type of other to preserve the symmetric nature of IEquatableDefinition.isSameDefinition(java.lang.Object).

Parameters:

other - The other instance to compare to this one.

Returns:

true if the two objects are defined equivalently; otherwise false.

computeCurrentDefinitionHashCode

protected int computeCurrentDefinitionHashCode()

Computes a hash code based on the current properties of this object. Derived classes MUST override this method and compute a hash code that combines: a unique hash code seed, the base implementation result, and the hash codes of all new fields introduced by the derived class which are used in the DenseMatrix.checkForSameDefinition(agi.foundation.coordinates.Matrix) method.

Overrides:

computeCurrentDefinitionHashCode in class Matrix

Returns:

The computed hash code.

get

public double get(int rowIndex,
                  int columnIndex)

Gets the value at the specified location in the matrix.

Specified by:

get in class Matrix

Parameters:

rowIndex - The row index of the element being queried.

columnIndex - The column index of the element being queried.

Returns:

The value in the matrix.

Throws:

IndexOutOfBoundsException - Thrown when rowIndex is greater than RowDimension (get), or when columnIndex is greater than ColumnDimension (get), or when either are less than zero.

set

public void set(int rowIndex,
                int columnIndex,
                double value)

Sets the value at the specified location in the matrix.

Specified by:

set in class Matrix

Parameters:

rowIndex - The row index of the element being queried.

columnIndex - The column index of the element being queried.

Throws:

IndexOutOfBoundsException - Thrown when rowIndex is greater than RowDimension (get), or when columnIndex is greater than ColumnDimension (get), or when either are less than zero.

equals

public boolean equals(Object obj)

Indicates whether another object is exactly equal to this instance.

Overrides:

equals in class Object

Parameters:

obj - The object to compare to this instance.

Returns:

true if obj is an instance of this type and represents the same value as this instance; otherwise false.

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns a hash code for this instance, which is suitable for use in hashing algorithms and data structures like a hash table.

Overrides:

hashCode in class Object

Returns:

A hash code for the current object.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)

clear

public final void clear()

Sets the value of every value in the matrix to zero.

multiply

public Matrix multiply(double factor)

Creates a new Matrix which has the value of the current matrix multiplied by the given factor.

Specified by:

multiply in class Matrix

Parameters:

factor - The 'scalar' to multiply by the current Matrix.

Returns:

The new matrix.

multiplyAssign

@Nonnull
public final DenseMatrix multiplyAssign(double s)

Multiply a matrix by a scalar in place, A = s*A

Parameters:

s - The scalar.

Returns:

A reference to this matrix, for convenience in performing multiple operations in a single line of code.

multiply

@Nonnull
public final double[] multiply(@Nonnull
                                         double[] vector)

Returns the result of the multiplication of this matrix and a vector.

Parameters:

vector - The vector to be multiplied.

Returns:

The resultant vector.

multiply

public static double[] multiply(DenseMatrix matrix,
                                double[] vector)

Returns the result of the multiplication of a matrix and a vector.

Parameters:

matrix - The matrix to multiply by the vector.

vector - The vector being multiplied.

Returns:

The array of doubles which is the product of the given matrix and vector.

solve

public final double[] solve(double[] vectorB)

Solve A*X = B

Parameters:

vectorB - right hand side

Returns:

solution if A is square, least squares solution otherwise

identity

@Nonnull
public static DenseMatrix identity(int rowDimension,
                                             int columnDimension)

Generates an identity matrix.

Parameters:

rowDimension - Number of rows.

columnDimension - Number of columns.

Returns:

An m-by-n matrix with ones on the diagonal and zeros elsewhere.

transpose

public Matrix transpose()

Creates a new Matrix which is the transpose of the current matrix.

Specified by:

transpose in class Matrix

Returns:

The new matrix.