Package org.apache.commons.math.analysis

Examples of org.apache.commons.math.analysis.Expm1Function

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     * Test of interpolator for the exponential function.
     * <p>
     * |expm1^(n)(zeta)| <= e, zeta in [-1, 1]
     */
    public void testExpm1Function() throws MathException {
        UnivariateRealFunction f = new Expm1Function();
        UnivariateRealInterpolator interpolator = new NevilleInterpolator();
        double x[], y[], z, expected, result, tolerance;

        // 5 interpolating points on interval [-1, 1]
        int n = 5;
        double min = -1.0, max = 1.0;
        x = new double[n];
        y = new double[n];
        for (int i = 0; i < n; i++) {
            x[i] = min + i * (max - min) / n;
            y[i] = f.value(x[i]);
        }
        double derivativebound = Math.E;
        UnivariateRealFunction p = interpolator.interpolate(x, y);

        z = 0.0; expected = f.value(z); result = p.value(z);
        tolerance = Math.abs(derivativebound * partialerror(x, z));
        assertEquals(expected, result, tolerance);

        z = 0.5; expected = f.value(z); result = p.value(z);
        tolerance = Math.abs(derivativebound * partialerror(x, z));
        assertEquals(expected, result, tolerance);

        z = -0.5; expected = f.value(z); result = p.value(z);
        tolerance = Math.abs(derivativebound * partialerror(x, z));
        assertEquals(expected, result, tolerance);
    }
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     * Test of interpolator for the exponential function.
     * <p>
     * |expm1^(n)(zeta)| <= e, zeta in [-1, 1]
     */
    public void testExpm1Function() throws MathException {
        UnivariateRealFunction f = new Expm1Function();
        UnivariateRealInterpolator interpolator = new DividedDifferenceInterpolator();
        double x[], y[], z, expected, result, tolerance;

        // 5 interpolating points on interval [-1, 1]
        int n = 5;
        double min = -1.0, max = 1.0;
        x = new double[n];
        y = new double[n];
        for (int i = 0; i < n; i++) {
            x[i] = min + i * (max - min) / n;
            y[i] = f.value(x[i]);
        }
        double derivativebound = Math.E;
        UnivariateRealFunction p = interpolator.interpolate(x, y);

        z = 0.0; expected = f.value(z); result = p.value(z);
        tolerance = Math.abs(derivativebound * partialerror(x, z));
        assertEquals(expected, result, tolerance);

        z = 0.5; expected = f.value(z); result = p.value(z);
        tolerance = Math.abs(derivativebound * partialerror(x, z));
        assertEquals(expected, result, tolerance);

        z = -0.5; expected = f.value(z); result = p.value(z);
        tolerance = Math.abs(derivativebound * partialerror(x, z));
        assertEquals(expected, result, tolerance);
    }
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    /**
     * Test of solver for the exponential function.
     */
    public void testExpm1Function() throws MathException {
        UnivariateRealFunction f = new Expm1Function();
        UnivariateRealSolver solver = new RiddersSolver();
        double min, max, expected, result, tolerance;

        min = -1.0; max = 2.0; expected = 0.0;
        tolerance = Math.max(solver.getAbsoluteAccuracy(),
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     * It takes 10 to 15 iterations for the last two tests to converge.
     * In fact, if not for the bisection alternative, the solver would
     * exceed the default maximal iteration of 100.
     */
    public void testExpm1Function() throws MathException {
        UnivariateRealFunction f = new Expm1Function();
        UnivariateRealSolver solver = new MullerSolver();
        double min, max, expected, result, tolerance;

        min = -1.0; max = 2.0; expected = 0.0;
        tolerance = Math.max(solver.getAbsoluteAccuracy(),
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     * Test of solver for the exponential function using solve2().
     * <p>
     * It takes 25 to 50 iterations for the last two tests to converge.
     */
    public void testExpm1Function2() throws MathException {
        UnivariateRealFunction f = new Expm1Function();
        MullerSolver solver = new MullerSolver();
        double min, max, expected, result, tolerance;

        min = -1.0; max = 2.0; expected = 0.0;
        tolerance = Math.max(solver.getAbsoluteAccuracy(),
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Related Classes of org.apache.commons.math.analysis.Expm1Function

  • org.apache.commons.math.analysis.interpolation.DividedDifferenceInterpolatorTest
  • org.apache.commons.math.analysis.interpolation.NevilleInterpolatorTest
  • org.apache.commons.math.analysis.solvers.MullerSolverTest
  • org.apache.commons.math.analysis.solvers.RiddersSolverTest
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