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

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

All Implemented Interfaces:

NeighbourSelection

public class RndUnProblStudSelection
extends RandomUnassignmentSelection

Random unassignment of some problematic students. Problematic students are to be provided by a neighbour selection that was used before this one by RoundRobinNeighbourSelection.

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

Parameters:

Parameter	Type	Comment
Neighbour.RandomUnassignmentOfProblemStudentProb	Double	Probability of a random selection of a student from the given set of problematic students.

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

Nested classes/interfaces inherited from class net.sf.cpsolver.studentsct.heuristics.selection.RandomUnassignmentSelection

RandomUnassignmentSelection.UnassignStudentNeighbour

Field Summary

Fields inherited from class net.sf.cpsolver.studentsct.heuristics.selection.RandomUnassignmentSelection

iRandom

Constructor Summary

RndUnProblStudSelection(DataProperties properties, ProblemStudentsProvider psp)
Constructor

Method Summary

void	init(Solver solver) Initialization -- ProblemStudentsProvider.getProblemStudents() is called
Neighbour	selectNeighbour(Solution solution) With the given probabilty, a problematic 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

Constructor Detail

RndUnProblStudSelection

public RndUnProblStudSelection(DataProperties properties,
                               ProblemStudentsProvider psp)

Constructor

Parameters:

properties - configuration

psp - a class that provides the set of problematic students

Method Detail

init

public void init(Solver solver)

Initialization -- ProblemStudentsProvider.getProblemStudents() is called

Specified by:

init in interface NeighbourSelection

Overrides:

init in class RandomUnassignmentSelection

selectNeighbour

public Neighbour selectNeighbour(Solution solution)

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

Specified by:

selectNeighbour in interface NeighbourSelection

Overrides:

selectNeighbour in class RandomUnassignmentSelection

Parameters:

solution - given solution

Returns:

a neighbour assignment