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

java.lang.Object
  net.sf.cpsolver.studentsct.heuristics.selection.BranchBoundSelection
      net.sf.cpsolver.studentsct.heuristics.selection.OnlineSelection

All Implemented Interfaces:

NeighbourSelection

public class OnlineSelection
extends BranchBoundSelection

Section given student using branch & bound algorithm with no unassignments allowed.

Parameters:

Parameter	Type	Comment
Sectioning.UseStudentPreferencePenalties	Boolean	If true, StudentPreferencePenalties are used
Sectioning.Distribution	Integer	When student preference penalties are used, defines which distribution is to be used (one of StudentPreferencePenalties.sDistTypePreference, StudentPreferencePenalties.sDistTypePreferenceQuadratic, StudentPreferencePenalties.sDistTypePreferenceReverse, StudentPreferencePenalties.sDistTypeUniform)
Sectioning.UseOnlinePenalties	Boolean	If true, online sectioning penalties computed based on held/expected space are used.
Sectioning.Epsilon	Double	When both online penalties and student preference penalties are used: a solution based on online penalties is computed first, this solution (and the given epsilon) is then used to setup bounds on online penalties for the solution that minimizes student preference penalties. Limit on online penalty is computed as (1+Section.Epsilon)*BranchBoundSelection.Selection.getPenalty(), i.e., only sections with penalty equal or below this limit can be used -- among these the solution that minimizes student preference penalties is computed.

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

class

OnlineSelection.EpsilonSelection Branch & bound selection for a student

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

BranchBoundSelection.BranchBoundNeighbour, BranchBoundSelection.Selection

Field Summary

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

iDistanceConflict, iDistConfWeight, iMinimizePenalty, iOrder, iStudentsEnumeration, iTimeout, sDebug

Constructor Summary

OnlineSelection(DataProperties properties)
Constructor

Method Summary

BranchBoundSelection.Selection	getSelection(Student student) Branch & bound selection for a student
void	init(Solver solver) Criterion initialization
boolean	isUsePenalties() Use online penalties
boolean	isUseStudentPrefPenalties() Use student preference penalties
void	updateSpace(Student student) Update online sectioning info after the given student is sectioned

Methods inherited from class net.sf.cpsolver.studentsct.heuristics.selection.BranchBoundSelection

init, selectNeighbour

Methods inherited from class java.lang.Object

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

Constructor Detail

OnlineSelection

public OnlineSelection(DataProperties properties)

Constructor

Parameters:

properties - configuration

Method Detail

init

public void init(Solver solver)

Description copied from interface: NeighbourSelection

Criterion initialization

Specified by:

init in interface NeighbourSelection

Overrides:

init in class BranchBoundSelection

isUseStudentPrefPenalties

public boolean isUseStudentPrefPenalties()

Use student preference penalties

isUsePenalties

public boolean isUsePenalties()

Use online penalties

updateSpace

public void updateSpace(Student student)

Update online sectioning info after the given student is sectioned

getSelection

public BranchBoundSelection.Selection getSelection(Student student)

Branch & bound selection for a student

Overrides:

getSelection in class BranchBoundSelection