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Java example source code file (StepNormalizerOutputTestBase.java)

This example Java source code file (StepNormalizerOutputTestBase.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

arraylist, dimensionmismatchexception, firstorderdifferentialequations, firstorderintegrator, fixedstephandler, graggbulirschstoerintegrator, list, maxcountexceededexception, nobracketingexception, numberistoosmallexception, stepnormalizerbounds, stepnormalizeroutputtestbase, test, util

The StepNormalizerOutputTestBase.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.math3.ode.sampling;

import org.junit.Assert;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.math3.exception.DimensionMismatchException;
import org.apache.commons.math3.exception.MaxCountExceededException;
import org.apache.commons.math3.exception.NoBracketingException;
import org.apache.commons.math3.exception.NumberIsTooSmallException;
import org.apache.commons.math3.ode.FirstOrderDifferentialEquations;
import org.apache.commons.math3.ode.FirstOrderIntegrator;
import org.apache.commons.math3.ode.nonstiff.GraggBulirschStoerIntegrator;
import org.junit.Test;

/** Base class for step normalizer output tests. */
public abstract class StepNormalizerOutputTestBase
    implements FirstOrderDifferentialEquations, FixedStepHandler {

    /** The normalized output time values. */
    private List<Double> output;

    /**
     * Returns the start time.
     * @return the start time
     */
    protected abstract double getStart();

    /**
     * Returns the end time.
     * @return the end time
     */
    protected abstract double getEnd();

    /**
     * Returns the expected normalized output time values for increment mode.
     * @return the expected normalized output time values for increment mode
     */
    protected abstract double[] getExpInc();

    /**
     * Returns the expected reversed normalized output time values for
     * increment mode.
     * @return the expected reversed normalized output time values for
     * increment mode
     */
    protected abstract double[] getExpIncRev();

    /**
     * Returns the expected normalized output time values for multiples mode.
     * @return the expected normalized output time values for multiples mode
     */
    protected abstract double[] getExpMul();

    /**
     * Returns the expected reversed normalized output time values for
     * multiples mode.
     * @return the expected reversed normalized output time values for
     * multiples mode
     */
    protected abstract double[] getExpMulRev();

    /**
     * Returns the offsets for the unit tests below, in the order they are
     * given below. For each test, the left and right offsets are returned.
     * @return the offsets for the unit tests below, in the order they are
     * given below
     */
    protected abstract int[][] getO();

    /**
     * Get the array, given left and right offsets.
     * @param a the input array
     * @param offsetL the left side offset
     * @param offsetR the right side offset
     * @return the modified array
     */
    private double[] getArray(double[] a, int offsetL, int offsetR) {
        double[] copy = new double[a.length - offsetR - offsetL];
        System.arraycopy(a, offsetL, copy, 0, copy.length);
        return copy;
    }

    @Test
    public void testIncNeither()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpInc(), getO()[0][0], getO()[0][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.NEITHER, exp, false);
    }

    @Test
    public void testIncNeitherRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpIncRev(), getO()[1][0], getO()[1][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.NEITHER, exp, true);
    }

    @Test
    public void testIncFirst()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpInc(), getO()[2][0], getO()[2][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.FIRST, exp, false);
    }

    @Test
    public void testIncFirstRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpIncRev(), getO()[3][0], getO()[3][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.FIRST, exp, true);
    }

    @Test
    public void testIncLast()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpInc(), getO()[4][0], getO()[4][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.LAST, exp, false);
    }

    @Test
    public void testIncLastRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpIncRev(), getO()[5][0], getO()[5][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.LAST, exp, true);
    }

    @Test
    public void testIncBoth()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpInc(), getO()[6][0], getO()[6][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.BOTH, exp, false);
    }

    @Test
    public void testIncBothRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpIncRev(), getO()[7][0], getO()[7][1]);
        doTest(StepNormalizerMode.INCREMENT, StepNormalizerBounds.BOTH, exp, true);
    }

    @Test
    public void testMulNeither()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMul(), getO()[8][0], getO()[8][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.NEITHER, exp, false);
    }

    @Test
    public void testMulNeitherRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMulRev(), getO()[9][0], getO()[9][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.NEITHER, exp, true);
    }

    @Test
    public void testMulFirst()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMul(), getO()[10][0], getO()[10][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.FIRST, exp, false);
    }

    @Test
    public void testMulFirstRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMulRev(), getO()[11][0], getO()[11][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.FIRST, exp, true);
    }

    @Test
    public void testMulLast()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMul(), getO()[12][0], getO()[12][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.LAST, exp, false);
    }

    @Test
    public void testMulLastRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMulRev(), getO()[13][0], getO()[13][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.LAST, exp, true);
    }

    @Test
    public void testMulBoth()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMul(), getO()[14][0], getO()[14][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.BOTH, exp, false);
    }

    @Test
    public void testMulBothRev()
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        double[] exp = getArray(getExpMulRev(), getO()[15][0], getO()[15][1]);
        doTest(StepNormalizerMode.MULTIPLES, StepNormalizerBounds.BOTH, exp, true);
    }

    /**
     * The actual step normalizer output test code, shared by all the unit
     * tests.
     *
     * @param mode the step normalizer mode to use
     * @param bounds the step normalizer bounds setting to use
     * @param expected the expected output (normalized time points)
     * @param reverse whether to reverse the integration direction
     * @throws NoBracketingException
     * @throws MaxCountExceededException
     * @throws NumberIsTooSmallException
     * @throws DimensionMismatchException
     */
    private void doTest(StepNormalizerMode mode, StepNormalizerBounds bounds,
                        double[] expected, boolean reverse)
        throws DimensionMismatchException, NumberIsTooSmallException,
               MaxCountExceededException, NoBracketingException {
        // Forward test.
        FirstOrderIntegrator integ = new GraggBulirschStoerIntegrator(
                                                        1e-8, 1.0, 1e-5, 1e-5);
        integ.addStepHandler(new StepNormalizer(0.5, this, mode, bounds));
        double[] y   = {0.0};
        double start = reverse ? getEnd()   : getStart();
        double end   = reverse ? getStart() : getEnd();
        output       = new ArrayList<Double>();
        integ.integrate(this, start, y, end, y);
        double[] actual = new double[output.size()];
        for(int i = 0; i < actual.length; i++) {
            actual[i] = output.get(i);
        }
        Assert.assertArrayEquals(expected, actual, 1e-5);
    }

    /** {@inheritDoc} */
    public int getDimension() {
        return 1;
    }

    /** {@inheritDoc} */
    public void computeDerivatives(double t, double[] y, double[] yDot) {
        yDot[0] = y[0];
    }

    /** {@inheritDoc} */
    public void init(double t0, double[] y0, double t) {
    }

    /** {@inheritDoc} */
    public void handleStep(double t, double[] y, double[] yDot, boolean isLast) {
        output.add(t);
    }

}

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