agi.foundation.numericalmethods

(agi.foundation.core-2023r2.jar)

Class MultivariableFunctionEvaluationAndDerivativeResults<TResults,TDerivativeResults>

java.lang.Object

agi.foundation.numericalmethods.MultivariableFunctionEvaluationAndDerivativeResults<TResults,TDerivativeResults>

Type Parameters:

TResults - The results type of the function evaluation.

TDerivativeResults - The results type of the function derivative evaluation.

All Implemented Interfaces:

ICloneWithContext

public class MultivariableFunctionEvaluationAndDerivativeResults<TResults,TDerivativeResults>
extends Object
implements ICloneWithContext

Contains the evaluated value and derivative results of a multivariable function.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MultivariableFunctionEvaluationAndDerivativeResults(MultivariableFunctionEvaluationAndDerivativeResults<TResults,TDerivativeResults> existingInstance, CopyContext context) Initializes a new instance as a copy of an existing instance.
	MultivariableFunctionEvaluationAndDerivativeResults(TResults value, TDerivativeResults firstDerivative) Initializes a new instance.

Method Summary

Modifier and Type	Method and Description
Object	clone(CopyContext context) Clones this object using the specified context.
TDerivativeResults	getDerivativeResults() Gets the derivative results from the evaluation of the multivariable function.
TResults	getValue() Gets the results from the evaluation of the multivariable function.

Methods inherited from class java.lang.Object

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

Constructor Detail

MultivariableFunctionEvaluationAndDerivativeResults

public MultivariableFunctionEvaluationAndDerivativeResults(TResults value,
                                                           TDerivativeResults firstDerivative)

Initializes a new instance.

Parameters:

value - The results from the evaluation of the SolvableMultivariableFunction.

firstDerivative - The derivative results from the evaluation of the SolvableMultivariableFunction.

MultivariableFunctionEvaluationAndDerivativeResults

protected MultivariableFunctionEvaluationAndDerivativeResults(@Nonnull
                                                              MultivariableFunctionEvaluationAndDerivativeResults<TResults,TDerivativeResults> 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

Parameters:

context - The context to use to perform the copy.

Returns:

A new instance which is a copy of this object.

getValue

public final TResults getValue()

Gets the results from the evaluation of the multivariable function.

getDerivativeResults

public final TDerivativeResults getDerivativeResults()

Gets the derivative results from the evaluation of the multivariable function.