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

Example 36 with Variable

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

the class P20150127a method getModel.

public static ExpressionsBasedModel getModel() {
    final ExpressionsBasedModel retVal = new ExpressionsBasedModel();
    final Variable x = Variable.make("x").integer(true);
    final Variable y = Variable.make("y").integer(true);
    retVal.addVariable(x);
    retVal.addVariable(y);
    int counter = 0;
    for (final int[] coeff : P20150127a.getCoefficients()) {
        final Expression tmpExpression = retVal.addExpression("inequality_" + ++counter);
        // We want coeff[0] * x + coeff[1] * y < 0. Since our
        // solutions are integer, we can do "<= -1".
        tmpExpression.upper(BigDecimal.ONE.negate());
        tmpExpression.set(x, coeff[0]);
        tmpExpression.set(y, coeff[1]);
    }
    return retVal;
}

Example 37 with Variable

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

the class P20150127b method getModel.

public static ExpressionsBasedModel getModel(final boolean branch, final boolean old) {
    final ExpressionsBasedModel retVal = new ExpressionsBasedModel();
    final Variable x = Variable.make("x").integer(true);
    final Variable y = Variable.make("y").integer(true);
    retVal.addVariable(x);
    retVal.addVariable(y);
    final List<int[]> coefficients = P20150127b.getCoefficients();
    int counter = 0;
    for (final int[] coeff : coefficients) {
        final Expression c = retVal.addExpression("inequality_" + ++counter);
        // We want coeff[0] * x + coeff[1] * y < 0. Since our
        // solutions are integer, we can do "<= -1".
        c.upper(BigDecimal.ONE.negate());
        c.set(x, coeff[0]);
        c.set(y, coeff[1]);
    }
    // the Branch&Bounde node which produces a wrong result uses.
    if (branch) {
        x.lower(1).upper(20);
        y.upper(-1);
        if (old) {
            // The integer solver used to set this lower limit in place of "no limit"
            y.lower(Integer.MIN_VALUE);
            retVal.relax(true);
        }
    }
    return retVal;
}

Example 38 with Variable

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

the class DesignCase method testFacilityLocation.

/**
 * http://www.ohio.edu/people/melkonia/math3050/slides/IPextendedintro.ppt Slide 8
 */
@Test
public void testFacilityLocation() {
    final ArrayList<Variable> tmpVariables = new ArrayList<>();
    tmpVariables.add(Variable.makeBinary("Factory in LA").weight(9));
    tmpVariables.add(Variable.makeBinary("Factory in SF").weight(5));
    tmpVariables.add(Variable.makeBinary("Warehouse in LA").weight(6));
    tmpVariables.add(Variable.makeBinary("Warehouse in SF").weight(4));
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel();
    tmpModel.addVariables(tmpVariables);
    final Expression tmpBudgetCost = tmpModel.addExpression("Budget").upper(10);
    tmpBudgetCost.set(tmpVariables.get(0), 6);
    tmpBudgetCost.set(tmpVariables.get(1), 3);
    tmpBudgetCost.set(tmpVariables.get(2), 5);
    tmpBudgetCost.set(tmpVariables.get(3), 2);
    // tmpModel.options.debug(GenericSolver.class);
    final Result tmpResult = tmpModel.maximise();
    TestUtils.assertStateNotLessThanOptimal(tmpResult);
    TestUtils.assertEquals(15.0, tmpResult.getValue());
    TestUtils.assertEquals(0.0, tmpResult.doubleValue(0));
    TestUtils.assertEquals(1.0, tmpResult.doubleValue(1));
    TestUtils.assertEquals(1.0, tmpResult.doubleValue(2));
    TestUtils.assertEquals(1.0, tmpResult.doubleValue(3));
}

Example 39 with Variable

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

the class IntegerProblems method testP20130409a.

/**
 * apete's implementation of the original problem description.
 * <a href="http://bugzilla.optimatika.se/show_bug.cgi?id=178">BugZilla</a>
 */
@Test
public void testP20130409a() {
    final Variable[] tmpVariables = new Variable[] { new Variable("x1").lower(BigMath.ZERO).weight(BigMath.ONE), new Variable("x2013").lower(BigMath.ZERO).integer(true), new Variable("x2014").lower(BigMath.ZERO).integer(true) };
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel(tmpVariables);
    final Expression tmpExpr1 = tmpModel.addExpression("Expr1");
    tmpExpr1.set(0, -1);
    tmpExpr1.set(1, 5100);
    tmpExpr1.set(2, -5000);
    tmpExpr1.upper(BigMath.ZERO);
    final Expression tmpExpr2 = tmpModel.addExpression("Expr2");
    tmpExpr2.set(0, 1);
    tmpExpr2.set(1, 5100);
    tmpExpr2.set(2, -5000);
    tmpExpr2.lower(BigMath.ZERO);
    final Expression tmpExpr3 = tmpModel.addExpression("Expr3");
    tmpExpr3.set(1, 5000);
    tmpExpr3.set(2, 5000);
    tmpExpr3.level(new BigDecimal(19105000));
    final BigArray tmpExpSol = BigArray.wrap(new BigDecimal[] { BigDecimal.valueOf(4200.000000000075), BigDecimal.valueOf(1892), BigDecimal.valueOf(1929) });
    TestUtils.assertTrue("Expected Solution Not Valid", tmpModel.validate(tmpExpSol));
    // tmpModel.options.debug(GenericSolver.class);
    // tmpModel.options.problem = NumberContext.getGeneral(12);
    final Result tmpResult = tmpModel.minimise();
    // BasicLogger.debug(tmpResult.toString());
    TestUtils.assertEquals("Solution Not Correct", tmpExpSol, tmpResult, new NumberContext(8, 8));
    TestUtils.assertTrue("Solver State Not Optimal", tmpResult.getState().isOptimal());
}

Example 40 with Variable

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

the class IntegerProblems method testP20130409b.

/**
 * Test case sent in by the user / problem reporter
 * <a href="http://bugzilla.optimatika.se/show_bug.cgi?id=178">BugZilla</a>
 */
@Test
public void testP20130409b() {
    final Variable x1 = Variable.make("x1");
    final Variable x2013 = Variable.make("x2013");
    final Variable x2014 = Variable.make("x2014");
    final Variable x2015 = Variable.make("x2015");
    x2013.setInteger(true);
    x2014.setInteger(true);
    x2015.setInteger(true);
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel();
    tmpModel.addVariable(x1);
    tmpModel.addVariable(x2013);
    tmpModel.addVariable(x2014);
    tmpModel.addVariable(x2015);
    final Expression obj = tmpModel.addExpression("obj");
    obj.set(x1, 1);
    obj.weight(BigDecimal.valueOf(1));
    final Expression c1 = tmpModel.addExpression("c1");
    c1.set(x1, 1);
    c1.lower(BigDecimal.valueOf(0));
    final Expression c2 = tmpModel.addExpression("c2");
    c2.set(x2014, -5000);
    c2.set(x2013, 5100);
    c2.set(x1, -1);
    c2.upper(BigDecimal.valueOf(0));
    final Expression c3 = tmpModel.addExpression("c3");
    c3.set(x2014, -5000);
    c3.set(x2013, 5100);
    c3.set(x1, 1);
    c3.lower(BigDecimal.valueOf(0));
    final Expression c4 = tmpModel.addExpression("c4");
    c4.set(x2014, 150);
    c4.set(x2013, 5100);
    c4.set(x2015, -5000);
    c4.set(x1, -1);
    c4.upper(BigDecimal.valueOf(0));
    final Expression c5 = tmpModel.addExpression("c5");
    c5.set(x2014, 150);
    c5.set(x2013, 5100);
    c5.set(x2015, -5000);
    c5.set(x1, 1);
    c5.lower(BigDecimal.valueOf(0));
    final Expression c6 = tmpModel.addExpression("c6");
    c6.set(x2015, 5000);
    c6.set(x2014, 5000);
    c6.set(x2013, 5000);
    c6.level(BigDecimal.valueOf(19105000));
    final BigArray tmpExpSol = BigArray.wrap(new BigDecimal[] { BigDecimal.valueOf(4849.999999997941), BigDecimal.valueOf(1245), BigDecimal.valueOf(1269), BigDecimal.valueOf(1307) });
    TestUtils.assertTrue("Expected Solution Not Valid", tmpModel.validate(tmpExpSol));
    // tmpModel.options.debug(IntegerSolver.class);
    // tmpModel.options.problem = NumberContext.getGeneral(8);
    final Result tmpResult = tmpModel.minimise();
    // BasicLogger.debug(tmpResult.toString());
    TestUtils.assertEquals("Solution Not Correct", tmpExpSol, tmpResult, new NumberContext(8, 8));
    TestUtils.assertTrue("Solver State Not Optimal", tmpResult.getState().isOptimal());
}