org.cpsolver.studentsct.heuristics.selection

Class RandomUnassignmentSelection

java.lang.Object

org.cpsolver.studentsct.heuristics.selection.RandomUnassignmentSelection

All Implemented Interfaces:

NeighbourSelection<Request,Enrollment>

Direct Known Subclasses:

RndUnProblStudSelection

public class RandomUnassignmentSelection
extends Object
implements NeighbourSelection<Request,Enrollment>

Random unassignment of some (randomly selected) students.

In each step a student is randomly selected with the given probabilty. Null is returned otherwise (controll is passed to the following NeighbourSelection).

Parameters:

Related Solver Parameters

Parameter	Type	Comment
Neighbour.RandomUnassignmentProb	Double	Probability of a random selection of a student.

Version:

StudentSct 1.3 (Student Sectioning)
Copyright (C) 2007 - 2014 Tomáš Müller
muller@unitime.org
http://muller.unitime.org

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not see http://www.gnu.org/licenses/.

Author:

Tomáš Müller

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RandomUnassignmentSelection.UnassignStudentNeighbour Unassignment of all requests of a student

Field Summary

Fields

Modifier and Type	Field and Description
protected double	iRandom

Constructor Summary

Constructors

Constructor and Description
RandomUnassignmentSelection(DataProperties properties)
RandomUnassignmentSelection(DataProperties properties, Request.RequestPriority priority) Constructor

Method Summary

Modifier and Type	Method and Description
void	init(Solver<Request,Enrollment> solver) Initialization
Neighbour<Request,Enrollment>	selectNeighbour(Solution<Request,Enrollment> solution) With the given probabilty, a student is randomly selected to be unassigned.

Methods inherited from class java.lang.Object

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

Field Detail

iRandom

protected double iRandom

Constructor Detail

RandomUnassignmentSelection

public RandomUnassignmentSelection(DataProperties properties,
                                   Request.RequestPriority priority)

Constructor

Parameters:

properties - configuration

RandomUnassignmentSelection

public RandomUnassignmentSelection(DataProperties properties)

Method Detail

init

public void init(Solver<Request,Enrollment> solver)

Initialization

Specified by:

init in interface NeighbourSelection<Request,Enrollment>

Parameters:

solver - current solver

selectNeighbour

public Neighbour<Request,Enrollment> selectNeighbour(Solution<Request,Enrollment> solution)

With the given probabilty, a student is randomly selected to be unassigned. Null is returned otherwise.

Specified by:

selectNeighbour in interface NeighbourSelection<Request,Enrollment>

Parameters:

solution - given solution

Returns:

a neighbour assignment