net.sf.cpsolver.studentsct.heuristics.selection
Class RandomUnassignmentSelection

java.lang.Object
  net.sf.cpsolver.studentsct.heuristics.selection.RandomUnassignmentSelection

All Implemented Interfaces:

NeighbourSelection

Direct Known Subclasses:

RndUnProblStudSelection

public class RandomUnassignmentSelection
extends Object
implements NeighbourSelection

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:

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

Version:

StudentSct 1.1 (Student Sectioning)
Copyright (C) 2007 Tomáš Müller
muller@unitime.org
Lazenska 391, 76314 Zlin, Czech Republic

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 2.1 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Nested Class Summary

static class

RandomUnassignmentSelection.UnassignStudentNeighbour Unassignment of all requests of a student

Field Summary

protected double

iRandom

Constructor Summary

RandomUnassignmentSelection(DataProperties properties)
Constructor

Method Summary

void	init(Solver solver) Initialization
Neighbour	selectNeighbour(Solution 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)

Constructor

Parameters:

properties - configuration

Method Detail

init

public void init(Solver solver)

Initialization

Specified by:

init in interface NeighbourSelection

selectNeighbour

public Neighbour selectNeighbour(Solution solution)

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

Specified by:

selectNeighbour in interface NeighbourSelection

Parameters:

solution - given solution

Returns:

a neighbour assignment