org.ptolemy.optimization

Class ObjectiveFunctionForPhaseI

java.lang.Object

org.ptolemy.optimization.ObjectiveFunction

org.ptolemy.optimization.ObjectiveFunctionForPhaseI

class ObjectiveFunctionForPhaseI
extends ObjectiveFunction

The objective function class which is used in Phase 1 of the interior point method. In the interior point method, a starting point X must be a feasible point that satisfies all constraints. To find the feasible point, the interior point method calculate Phase 1 using this class.

Author:

shuhei emoto

Field Summary

Fields inherited from class org.ptolemy.optimization.ObjectiveFunction

currentX, f0Gradient, f0Hessian, f0Result, fiGradients, fiHessians, fiResults, iterationCounter, quasiNewtonMethod, stopRequested

Constructor Summary

Constructors

Constructor and Description
ObjectiveFunctionForPhaseI(ObjectiveFunction a_source)

Method Summary

Modifier and Type	Method and Description
void	calcFuncInternal(double[] x) Objective function called in Phase I.
boolean	calcFunction(double[] x) Objective function and constraint functions.
boolean	checkPhaseICriteria() Check the termination criteria in phase I.
void	setCurrentPoint(double[] x) Set current searching point X.
boolean	setInitialValue(double tolerance) Set initial residual value s.

Methods inherited from class org.ptolemy.optimization.ObjectiveFunction

checkFeasibility, clearMatrix, getCurrentPoint

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectiveFunctionForPhaseI

public ObjectiveFunctionForPhaseI(ObjectiveFunction a_source)

Method Detail

calcFunction

public boolean calcFunction(double[] x)

Description copied from class: ObjectiveFunction

Objective function and constraint functions. In this function, all results(f0_result, fi_results) and gradients(f0_gradient, fi_gradients) must be updated.

Specified by:

calcFunction in class ObjectiveFunction

Parameters:

x - : input variables

Returns:

If calculation was terminated by user input, return "false".

calcFuncInternal

public void calcFuncInternal(double[] x)

Objective function called in Phase I. (Searching for feasible initial point)

Overrides:

calcFuncInternal in class ObjectiveFunction

Parameters:

x - input variables

checkPhaseICriteria

public boolean checkPhaseICriteria()

Check the termination criteria in phase I.

Returns:

true if all of constraints are negative and Phase I should finish.

setCurrentPoint

public void setCurrentPoint(double[] x)

Set current searching point X.

Parameters:

x - current point which is to be set.

setInitialValue

public boolean setInitialValue(double tolerance)

Set initial residual value s.

Parameters:

tolerance - : the value which defines margin from constraints.

Returns:

true if initial value is already feasible.