Examples of org.apache.commons.math.optimization.fitting.CurveFitter.fit()

Package org.apache.commons.math.optimization.fitting

Class org.apache.commons.math.optimization.fitting.CurveFitter

Examples of org.apache.commons.math.optimization.fitting.CurveFitter.fit()

org.apache.commons.math.optimization.fitting.CurveFitter.fit()
Fit a curve.
This method compute the coefficients of the curve that best fit the sample of observed points previously given through calls to the {@link #addObservedPoint(WeightedObservedPoint) addObservedPoint} method.
@param f parametric function to fit @param initialGuess first guess of the function parameters @return fitted parameters @exception FunctionEvaluationException if the objective function throws one during the search @exception OptimizationException if the algorithm failed to converge @exception IllegalArgumentException if the start point dimension is wrong

    @Test
    public void testFit01()
    throws OptimizationException, FunctionEvaluationException {
        CurveFitter fitter = new CurveFitter(new LevenbergMarquardtOptimizer());
        addDatasetToCurveFitter(DATASET1, fitter);
        double[] parameters = fitter.fit(new ParametricGaussianFunction(),
                                         new double[] {8.64753e3, 3.483323e6, 4.06322, 1.946857e-2});
        assertEquals(99200.94715858076, parameters[0], 1e-4);
        assertEquals(3410515.221897707, parameters[1], 1e-4);
        assertEquals(4.054928275257894, parameters[2], 1e-4);
        assertEquals(0.014609868499860, parameters[3], 1e-4);

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    @Test
    public void testFit02()
    throws OptimizationException, FunctionEvaluationException {
        CurveFitter fitter = new CurveFitter(new LevenbergMarquardtOptimizer());
        addDatasetToCurveFitter(DATASET1, fitter);
        double[] parameters = fitter.fit(new ParametricGaussianFunction(),
                                         new double[] {500000.0, 3500000.0, 4.055, 0.025479654});
        assertEquals(99200.81836264656, parameters[0], 1e-4);
        assertEquals(3410515.327151986, parameters[1], 1e-4);
        assertEquals(4.054928275377392, parameters[2], 1e-4);
        assertEquals(0.014609869119806, parameters[3], 1e-4);

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