org.omegahat.Numerics.Optimizers
Class BasicDerivativeValues

java.lang.Object
  |
  +--org.omegahat.Numerics.Optimizers.BasicDerivativeValues

All Implemented Interfaces:

DerivativeValues

public class BasicDerivativeValues

extends java.lang.Object

implements DerivativeValues

Represents a particular value of the first and second derivatives of a function, stored together to facilitate computing them in a single to avoid repeating computations for each. Note that this is for storing values of derivatives and not the objects which compute them (i.e. Gradient and Hessian).

Field Summary

protected double[]	gradient The value of the gradient (not the object from which it is computed).
protected Matrix	hessian The value of the second derivative

Constructor Summary

BasicDerivativeValues()

BasicDerivativeValues(double[] gradient)

BasicDerivativeValues(double[] gradient, Matrix hessian)

Method Summary

double[]	gradient() Access to gradient field.
double[]	gradient(double[] g) Access to set the gradient field value.
Matrix	hessian() Access to hessian field.
Matrix	hessian(Matrix m) Access to set the hessian field value.

Methods inherited from class java.lang.Object

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

Field Detail

gradient

protected double[] gradient

The value of the gradient (not the object from which it is computed).

hessian

protected Matrix hessian

The value of the second derivative

Constructor Detail

BasicDerivativeValues

public BasicDerivativeValues()

BasicDerivativeValues

public BasicDerivativeValues(double[] gradient)

BasicDerivativeValues

public BasicDerivativeValues(double[] gradient,
                             Matrix hessian)

Method Detail

gradient

public double[] gradient()

Access to gradient field.

Specified by:

gradient in interface DerivativeValues

gradient

public double[] gradient(double[] g)

Access to set the gradient field value.

hessian

public Matrix hessian()

Access to hessian field.

Specified by:

hessian in interface DerivativeValues

hessian

public Matrix hessian(Matrix m)

Access to set the hessian field value.