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

Example 26 with ExpressionsBasedModel

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

the class LinearDesignTestCases method test6LinearModelCase.

/**
 * Simplest possible unbounded model
 */
@Test
public void test6LinearModelCase() {
    final Variable[] tmpVariables = new Variable[] { new Variable("X1").lower(ZERO).weight(ONE), new Variable("X2").lower(ZERO).weight(TWO), new Variable("X3").lower(ZERO).weight(THREE) };
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel(tmpVariables);
    final Optimisation.Result tmpResult = tmpModel.maximise();
    TestUtils.assertEquals(State.UNBOUNDED, tmpResult.getState());
}

Example 27 with ExpressionsBasedModel

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

the class LinearDesignTestCases method test2LinearModelCase.

/**
 * http://www.stats.ox.ac.uk/~yu/4_Simplex_II.pdf
 */
@Test
public void test2LinearModelCase() {
    final Variable[] tmpVariables = new Variable[] { new Variable("X1").lower(ZERO).weight(THREE), new Variable("X2").lower(ZERO).weight(ZERO), new Variable("X3").lower(ZERO).weight(ONE) };
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel(tmpVariables);
    final Expression tmpExprC1 = tmpModel.addExpression("C1");
    for (int i = 0; i < tmpModel.countVariables(); i++) {
        tmpExprC1.set(i, new BigDecimal[] { ONE, TWO, ONE }[i]);
    }
    tmpExprC1.level(TEN);
    final Expression tmpExprC2 = tmpModel.addExpression("C2");
    for (int i = 0; i < tmpModel.countVariables(); i++) {
        tmpExprC2.set(i, new BigDecimal[] { ONE, TWO.negate(), TWO }[i]);
    }
    tmpExprC2.level(SIX);
    final Optimisation.Result tmpResult = tmpModel.maximise();
    final BasicMatrix tmpSolution = RationalMatrix.FACTORY.columns(tmpResult);
    final PhysicalStore<Double> tmpExpX = PrimitiveDenseStore.FACTORY.rows(new double[][] { { 8.0 }, { 1.0 }, { 0.0 } });
    final PhysicalStore<Double> tmpActX = PrimitiveDenseStore.FACTORY.copy(tmpSolution.selectRows(new int[] { 0, 1, 2 }));
    TestUtils.assertEquals(tmpExpX, tmpActX);
}

Example 28 with ExpressionsBasedModel

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

the class LinearDesignTestCases method test4LinearModelCase.

/**
 * http://www.saintmarys.edu/~psmith/338act14.html
 */
@Test
public void test4LinearModelCase() {
    final Variable[] tmpVariables = new Variable[] { new Variable("X1").lower(ZERO).weight(ONE.negate()), new Variable("X2").lower(ZERO).weight(ONE), new Variable("X3").lower(ZERO).weight(ZERO) };
    final ExpressionsBasedModel tmpModel = new ExpressionsBasedModel(tmpVariables);
    final Expression tmpExprC1 = tmpModel.addExpression("C1");
    for (int i = 0; i < tmpModel.countVariables(); i++) {
        tmpExprC1.set(i, new BigDecimal[] { SIX, ONE.negate(), ZERO }[i]);
    }
    tmpExprC1.upper(TEN);
    final Expression tmpExprC2 = tmpModel.addExpression("C2");
    for (int i = 0; i < tmpModel.countVariables(); i++) {
        tmpExprC2.set(i, new BigDecimal[] { ONE, FIVE, ZERO }[i]);
    }
    tmpExprC2.lower(FOUR);
    final Expression tmpExprC3 = tmpModel.addExpression("C3");
    for (int i = 0; i < tmpModel.countVariables(); i++) {
        tmpExprC3.set(i, new BigDecimal[] { ONE, FIVE, ONE }[i]);
    }
    tmpExprC3.level(FIVE);
    final Optimisation.Result tmpResult = tmpModel.minimise();
    final BasicMatrix tmpSolution = RationalMatrix.FACTORY.columns(tmpResult);
    final PhysicalStore<Double> tmpExpX = PrimitiveDenseStore.FACTORY.rows(new double[][] { { 1.74 }, { 0.45 }, { 1.0 } });
    final PhysicalStore<Double> tmpActX = PrimitiveDenseStore.FACTORY.copy(tmpSolution.selectRows(new int[] { 0, 1, 2 }));
    tmpActX.modifyAll(new NumberContext(7, 2).getFunction(PrimitiveFunction.getSet()));
    TestUtils.assertEquals(tmpExpX, tmpActX);
}

Example 29 with ExpressionsBasedModel

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

the class LinearProblems method testP20180310_62.

/**
 * https://github.com/optimatika/ojAlgo/issues/62
 */
@Test
public void testP20180310_62() {
    final Variable x = Variable.make("x").lower(0).weight(1);
    final Variable y = Variable.make("y").lower(0).weight(0);
    final ExpressionsBasedModel model = new ExpressionsBasedModel();
    model.addVariable(x);
    model.addVariable(y);
    model.addExpression("first").set(x, 0).set(y, 1).lower(1);
    model.addExpression("second").set(x, 0).set(y, 1).upper(-1);
    TestUtils.assertEquals(Optimisation.State.INFEASIBLE, model.maximise().getState());
}

Example 30 with ExpressionsBasedModel

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

the class LinearProblems method testP20150127.

/**
 * Problemet var att en av noderna som IntegerSolver genererade var infeasible, men det misslyckades
 * LinearSolver med att identifiera och returnerade en felaktig lösning som OPTIMAL. Detta testfall
 * motsvarar
 */
@Test
public void testP20150127() {
    final ExpressionsBasedModel tmpModel = P20150127b.getModel(true, true);
    // tmpModel.options.debug(LinearSolver.class);
    // Kan få testfallet att gå igenom, men dåsmäller andra testfall
    // tmpModel.options.objective = tmpModel.options.objective.newScale(8);
    final Result tmpResult = tmpModel.minimise();
    // Should be infeasible
    TestUtils.assertStateLessThanFeasible(tmpResult);
    TestUtils.assertFalse(tmpModel.validate(tmpResult));
}