* Copyright 2007-2008, Christof Lutteroth, lutteroth@cs.auckland.ac.nz
* Copyright 2007-2008, James Kim, jkim202@ec.auckland.ac.nz
* Distributed under the terms of the MIT License.
*/
#include <SupportDefs.h>
#include "LinearSpec.h"
#include <stdio.h>
using namespace LinearProgramming;
void
PrintResults(const VariableList& list)
{
for (int32 i = 0; i < list.CountItems(); i++)
printf("Variable %i = %f\n", (int)i, list.ItemAt(i)->Value());
}
void
Test1()
{
LinearSpec ls;
Variable* x1 = ls.AddVariable();
Variable* x2 = ls.AddVariable();
Constraint* c1 = ls.AddConstraint(1.0, x1, OperatorType(kLE), 108);
Constraint* c2 = ls.AddConstraint(1.0, x2, OperatorType(kGE), 113);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
ls.RemoveConstraint(c2);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
c2 = ls.AddConstraint(1.0, x2, OperatorType(kGE), 113);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
}
void
SoftConstraints()
{
printf("SoftConstraints\n\n");
LinearSpec ls;
Variable* x1 = ls.AddVariable();
x1->SetLabel("label_x1");
Variable* x2 = ls.AddVariable();
x2->SetLabel("label_x2");
Variable* x3 = ls.AddVariable();
x3->SetLabel("label_x3");
Constraint* c1 = ls.AddConstraint(1, x1, kEQ, 0);
Constraint* c2 = ls.AddConstraint(1, x1, -1, x2, kLE, 0);
Constraint* c3 = ls.AddConstraint(1, x2, -1, x3, kLE, 0);
Constraint* c4 = ls.AddConstraint(1, x3, -1, x1, kEQ, 20);
Constraint* c5 = ls.AddConstraint(1, x2, -1, x1, kEQ, 10, 5, 5);
Constraint* c6 = ls.AddConstraint(1, x3, -1, x2, kEQ, 5, 5, 5);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
PrintResults(ls.AllVariables());
ls.RemoveConstraint(c6);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
PrintResults(ls.UsedVariables());
}
void
SoftInequalityConstraints()
{
printf("SoftInequalityConstraints\n\n");
LinearSpec ls;
Variable* x1 = ls.AddVariable();
x1->SetLabel("label_x1");
Variable* x2 = ls.AddVariable();
x2->SetLabel("label_x2");
Variable* x3 = ls.AddVariable();
x3->SetLabel("label_x3");
Constraint* c1 = ls.AddConstraint(1, x1, kEQ, 0);
Constraint* c2 = ls.AddConstraint(1, x1, -1, x2, kLE, 0);
Constraint* c3 = ls.AddConstraint(1, x2, -1, x3, kLE, 0);
Constraint* c4 = ls.AddConstraint(1, x3, -1, x1, kEQ, 20);
Constraint* c5 = ls.AddConstraint(1, x2, -1, x1, kEQ, 15, 5, 5);
Constraint* c6 = ls.AddConstraint(1, x3, -1, x2, kGE, 10, 5000, 5);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
PrintResults(ls.AllVariables());
ls.RemoveConstraint(c6);
ls.Solve();
printf("ls: %s\n", ls.ToString().String());
PrintResults(ls.UsedVariables());
}
int
main()
{
Test1();
SoftConstraints();
SoftInequalityConstraints();
}
