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

java.lang.Object
  extended by net.sf.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:

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


Version:
StudentSct 1.2 (Student Sectioning)
Copyright (C) 2007 - 2010 Tomas Muller
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/.

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<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)
Constructor

Parameters:
properties - configuration
Method Detail

init

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

Specified by:
init in interface NeighbourSelection<Request,Enrollment>

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


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