Examples with ExpressionsBasedModel org.ojalgo.optimisation.ExpressionsBasedModel used on opensource projects

Example 91 with ExpressionsBasedModel

use of org.ojalgo.optimisation.ExpressionsBasedModel in project ojAlgo by optimatika.

the class LinearProblems method testP20180311_66.

/**
 * https://github.com/optimatika/ojAlgo/issues/66
 */
@Test
public void testP20180311_66() {
    final Variable x = Variable.make("x").lower(0).weight(2);
    final Variable y = Variable.make("y").lower(0).weight(-1);
    final Variable z = Variable.make("z").lower(0).weight(4);
    final ExpressionsBasedModel model = new ExpressionsBasedModel();
    model.addVariable(x);
    model.addVariable(y);
    model.addVariable(z);
    model.addExpression().set(x, 3).set(y, 2).set(z, 2).upper(0);
    model.addExpression().set(x, 0).set(y, 3).set(z, -2).lower(2);
    final Optimisation.Result result = model.maximise();
    TestUtils.assertEquals(Optimisation.State.INFEASIBLE, result.getState());
    TestUtils.assertFalse(model.validate(result));
}

Example 92 with ExpressionsBasedModel

use of org.ojalgo.optimisation.ExpressionsBasedModel in project ojAlgo by optimatika.

the class LinearProblems method testP20180312_69.

/**
 * https://github.com/optimatika/ojAlgo/issues/69
 */
@Test
public void testP20180312_69() {
    final Variable x = Variable.make("x").lower(0).weight(3);
    final Variable y = Variable.make("y").lower(0).weight(2);
    final Variable z = Variable.make("z").lower(0).weight(-2);
    final ExpressionsBasedModel model = new ExpressionsBasedModel();
    model.addVariable(x);
    model.addVariable(y);
    model.addVariable(z);
    model.addExpression().set(x, 0).set(y, 1).set(z, -2).level(4);
    model.addExpression().set(x, 0).set(y, 4).set(z, -2).upper(1);
    // ExpressionsBasedModel.clearPresolvers();
    final Optimisation.Result result = model.maximise();
    TestUtils.assertFalse(model.validate(result));
    TestUtils.assertEquals(Optimisation.State.INFEASIBLE, result.getState());
}

Example 93 with ExpressionsBasedModel

use of org.ojalgo.optimisation.ExpressionsBasedModel in project ojAlgo by optimatika.

the class LinearProblems method testP20111010.

/**
 * Depending on how the constraints were constructed the solver could fail to solve and report the problem
 * to be unbounded.
 */
@Test
public void testP20111010() {
    final Variable[] tmpVariables = new Variable[] { new Variable("X").lower(ZERO).weight(ONE), new Variable("Y").lower(ZERO).weight(ZERO), new Variable("Z").lower(ZERO).weight(ZERO) };
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel(tmpVariables);
    final Expression tmpExprC1 = tmpModel.addExpression("C1");
    tmpExprC1.level(ZERO);
    tmpExprC1.set(0, ONE);
    final Expression tmpExprC2 = tmpModel.addExpression("C2");
    tmpExprC2.level(ZERO);
    tmpExprC2.set(0, ONE);
    tmpExprC2.set(1, NEG);
    final Expression tmpExprC3 = tmpModel.addExpression("C3");
    tmpExprC3.level(ZERO);
    tmpExprC3.set(0, ONE);
    tmpExprC3.set(2, NEG);
    final BasicMatrix tmpExpectedSolution = PrimitiveMatrix.FACTORY.makeZero(3, 1);
    final Optimisation.Result tmpResult11 = tmpModel.minimise();
    // TestUtils.assertEquals(tmpExpectedState, tmpResult11.getState());
    TestUtils.assertStateNotLessThanOptimal(tmpResult11);
    TestUtils.assertEquals(tmpExpectedSolution, RationalMatrix.FACTORY.columns(tmpResult11));
    tmpExprC2.set(0, NEG);
    tmpExprC2.set(1, ONE);
    tmpExprC3.set(0, ONE);
    tmpExprC3.set(2, NEG);
    final Optimisation.Result tmpResultN1 = tmpModel.minimise();
    // TestUtils.assertEquals(tmpExpectedState, tmpResultN1.getState());
    TestUtils.assertStateNotLessThanOptimal(tmpResultN1);
    TestUtils.assertEquals(tmpExpectedSolution, RationalMatrix.FACTORY.columns(tmpResultN1));
    tmpExprC2.set(0, ONE);
    tmpExprC2.set(1, NEG);
    tmpExprC3.set(0, NEG);
    tmpExprC3.set(2, ONE);
    final Optimisation.Result tmpResult1N = tmpModel.minimise();
    // TestUtils.assertEquals(tmpExpectedState, tmpResult1N.getState());
    TestUtils.assertStateNotLessThanOptimal(tmpResult1N);
    TestUtils.assertEquals(tmpExpectedSolution, RationalMatrix.FACTORY.columns(tmpResult1N));
    tmpExprC2.set(0, NEG);
    tmpExprC2.set(1, ONE);
    tmpExprC3.set(0, NEG);
    tmpExprC3.set(2, ONE);
    final Optimisation.Result tmpResultNN = tmpModel.minimise();
    // TestUtils.assertEquals(tmpExpectedState, tmpResultNN.getState());
    TestUtils.assertStateNotLessThanOptimal(tmpResultNN);
    TestUtils.assertEquals(tmpExpectedSolution, RationalMatrix.FACTORY.columns(tmpResultNN));
}

Example 94 with ExpressionsBasedModel

use of org.ojalgo.optimisation.ExpressionsBasedModel in project ojAlgo by optimatika.

the class NetlibCase method testShare2b.

/**
 * OK! 2010-04-19 lp_solve => -415.73224074
 */
@Test
public void testShare2b() {
    final File tmpFile = new File(PATH + "share2b.mps");
    final MathProgSysModel tmpMPS = MathProgSysModel.make(tmpFile);
    final ExpressionsBasedModel tmpModel = tmpMPS.getExpressionsBasedModel();
    this.assertMinMaxVal(tmpModel, new BigDecimal("-4.1573224074E+02"), null);
}

Example 95 with ExpressionsBasedModel

use of org.ojalgo.optimisation.ExpressionsBasedModel in project ojAlgo by optimatika.

the class NetlibCase method testKb2.

/**
 * OK! 2010-04-19 lp_solve => -1749.90012991
 */
@Test
public void testKb2() {
    final File tmpFile = new File(PATH + "kb2.mps");
    final MathProgSysModel tmpMPS = MathProgSysModel.make(tmpFile);
    final ExpressionsBasedModel tmpModel = tmpMPS.getExpressionsBasedModel();
    this.assertMinMaxVal(tmpModel, new BigDecimal("-1.74990012991E+03"), null);
}