edu.harvard.econcs.jopt.solver.mip

Class MIPWrapper

java.lang.Object

edu.harvard.econcs.jopt.solver.mip.MIP

edu.harvard.econcs.jopt.solver.mip.MIPWrapper

All Implemented Interfaces:

IMIP, Serializable, Cloneable

public class MIPWrapper
extends MIP

This wrapper goes even further in simplicity than the other MIP classes and might help you get started with your MIP programming. See ExampleSimpleWrapper.java for an example.

Since:

Nov 26, 2004

Version:

$Revision: 1.2 $ on $Date: 2017/11/08 12:55:46 $

Author:

Jeff Shneidman; Last modified by $Author: blubin $

See Also:

Serialized Form

Field Summary

Fields inherited from class edu.harvard.econcs.jopt.solver.mip.MIP

MAX_VALUE

Method Summary

Modifier and Type	Method and Description
Constraint	beginNewEQConstraint(double constant) Creates a new Less Equals constraint
Constraint	beginNewGEQConstraint(double constant) Creates a new Less Than or Equals constraint
Constraint	beginNewLEQConstraint(double constant) Creates a new Less Than or Equals constraint This example makes a constraint "-2y <= 3" (assumes earlier call like:MIPWrapper mip = makeNewMaxMIP(), and a Variable y) Constraint c = beginNewLEQConstraint(3); c.addTerm(y, -2); mip.endConstraint(c); * @param constant is the value that is on the right hand side of the equation.
void	endConstraint(Constraint constraint) Call this when you are done building up a constraint.
static MIPWrapper	makeMIPWithoutObjective(IMIP mip)
Variable	makeNewBooleanVar(String name) Makes a new indicator (boolean) variable that can range from 0 to 1
Variable	makeNewDoubleVar(String name) Makes a new double variable that can range from -inf to inf
Variable	makeNewIntegerVar(String name) Makes a new Integer variable that can range from -inf to inf
static MIPWrapper	makeNewMaxMIP() Create a new MIP that is has a MAXimization as it's objective function.
static MIPWrapper	makeNewMinMIP() Create a new MIP that is has a MINimization as it's objective function.

Methods inherited from class edu.harvard.econcs.jopt.solver.mip.MIP

add, add, addObjectiveTerm, addObjectiveTerm, addObjectiveTerm, addObjectiveTerm, clearObjective, clearProposedValues, clearSolveParams, clone, getBooleanSolveParam, getBooleanSolveParam, getBooleanSolveParam, getConstraints, getDoubleSolveParam, getDoubleSolveParam, getDoubleSolveParam, getIntSolveParam, getIntSolveParam, getIntSolveParam, getLinearObjectiveTerms, getNumConstraints, getNumVars, getObjectiveTerms, getProposedBooleanValue, getProposedDoubleValue, getProposedIntValue, getProposedValuesMap, getQuadraticObjectiveTerms, getSolveParam, getSortedLinearObjectiveTerms, getSortedQuadraticObjectiveTerms, getSpecifiedSolveParams, getStringSolveParam, getStringSolveParam, getVar, getVars, getVarsWithProposedValues, isObjectiveMax, isObjectiveMin, isSolveParamSpecified, proposeValue, proposeValue, proposeValue, remove, remove, removeObjectiveTerm, removeObjectiveTerm, removeProposedValue, resetDefaultSolveParams, setObjectiveMax, setProposedValues, setSolveParam, setSolveParam, toString, typedClone

Methods inherited from class java.lang.Object

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

Method Detail

makeNewMaxMIP

public static MIPWrapper makeNewMaxMIP()

Create a new MIP that is has a MAXimization as it's objective function. You would then add some objective terms. The following code makes a new MIP with "MAX 3X" as the objective.

MIPWrapper mip = makeNewMaxMIP();
Variable x = makeNewDoubleVar("x");
mip.addObjectiveTerm(x, 3);

Returns:

a mip object.

makeNewMinMIP

public static MIPWrapper makeNewMinMIP()

Create a new MIP that is has a MINimization as it's objective function. You would then add some objective terms. The following code makes a new MIP with "MIN 3X" as the objective.

MIPWrapper mip = makeNewMinMIP();
Variable x = makeNewDoubleVar("x");
mip.addObjectiveTerm(x, 3);

makeMIPWithoutObjective

public static MIPWrapper makeMIPWithoutObjective(IMIP mip)

Parameters:

mip -

Returns:

a new MIP that has the same constraints and vars as the old mip but no objective The Vars and Constraints are the same Objects so altering them will have an affect on both objects. Adding and removing constraints is independent though.

makeNewDoubleVar

public Variable makeNewDoubleVar(String name)

Makes a new double variable that can range from -inf to inf

makeNewIntegerVar

public Variable makeNewIntegerVar(String name)

Makes a new Integer variable that can range from -inf to inf

makeNewBooleanVar

public Variable makeNewBooleanVar(String name)

Makes a new indicator (boolean) variable that can range from 0 to 1

endConstraint

public void endConstraint(Constraint constraint)

Call this when you are done building up a constraint.

beginNewLEQConstraint

public Constraint beginNewLEQConstraint(double constant)

Creates a new Less Than or Equals constraint This example makes a constraint "-2y <= 3"
(assumes earlier call like:MIPWrapper mip = makeNewMaxMIP(), and a Variable y)

Constraint c = beginNewLEQConstraint(3);
c.addTerm(y, -2);
mip.endConstraint(c); * @param constant is the value that is on the right hand side of the equation.

Returns:

the new constraint. You will want to add terms to the constraint.

beginNewGEQConstraint

public Constraint beginNewGEQConstraint(double constant)

Creates a new Less Than or Equals constraint

See Also:

beginNewLEQConstraint

beginNewEQConstraint

public Constraint beginNewEQConstraint(double constant)

Creates a new Less Equals constraint

See Also:

beginNewLEQConstraint