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

java.lang.Object
  extended by net.sf.cpsolver.studentsct.heuristics.selection.RandomUnassignmentSelection
      extended by net.sf.cpsolver.studentsct.heuristics.selection.RndUnProblStudSelection
All Implemented Interfaces:
NeighbourSelection<Request,Enrollment>

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 1.2 (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
 
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<Request,Enrollment> solver)
          Initialization -- ProblemStudentsProvider.getProblemStudents() is called
 Neighbour<Request,Enrollment> selectNeighbour(Solution<Request,Enrollment> 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<Request,Enrollment> solver)
Initialization -- ProblemStudentsProvider.getProblemStudents() is called

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

selectNeighbour

public Neighbour<Request,Enrollment> selectNeighbour(Solution<Request,Enrollment> solution)
With the given probabilty, a problematic student is randomly selected to be unassigned. Null is returned otherwise.

Specified by:
selectNeighbour in interface NeighbourSelection<Request,Enrollment>
Overrides:
selectNeighbour in class RandomUnassignmentSelection
Parameters:
solution - given solution
Returns:
a neighbour assignment


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