fr.cnes.sirius.patrius.math.fitting

Class PolynomialChebyshevFitter

java.lang.Object

fr.cnes.sirius.patrius.math.fitting.CurveFitter<PolynomialChebyshevFunction>

fr.cnes.sirius.patrius.math.fitting.PolynomialChebyshevFitter

public class PolynomialChebyshevFitter
extends CurveFitter<PolynomialChebyshevFunction>

Chebyshev polynomial fitting is a very simple case of curve fitting. The estimated coefficients are the Chebyshev polynomial coefficients (see the fit method).

Author:

bonitt

Constructor Summary

Constructors

Constructor and Description
PolynomialChebyshevFitter(double start, double end, MultivariateVectorOptimizer optimizer) Simple constructor.

Method Summary

Modifier and Type	Method and Description
double[]	fit(double[] guess) Get the coefficients of the Chebyshev polynomial fitting the weighted data points.
double[]	fit(int maxEval, double[] guess) Get the coefficients of the Chebyshev polynomial fitting the weighted data points.

Methods inherited from class fr.cnes.sirius.patrius.math.fitting.CurveFitter

addObservedPoint, addObservedPoint, addObservedPoint, clearObservations, fit, fit, getObservations

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PolynomialChebyshevFitter

public PolynomialChebyshevFitter(double start,
                                 double end,
                                 MultivariateVectorOptimizer optimizer)

Simple constructor.

Parameters:

start - Start range

end - End range

optimizer - Optimizer to use for the fitting

Throws:

MathIllegalArgumentException - if start >= end

Method Detail

fit

public double[] fit(int maxEval,
                    double[] guess)

Get the coefficients of the Chebyshev polynomial fitting the weighted data points. The degree of the fitting polynomial is guess.length - 1.

Parameters:

guess - First guess for the coefficients. They must be sorted in increasing order of the polynomial's degree.

maxEval - Maximum number of evaluations of the polynomial

Returns:

the coefficients of the Chebyshev polynomial that best fits the observed points

Throws:

TooManyEvaluationsException - if the number of evaluations exceeds maxEval

ConvergenceException - if the algorithm failed to converge

fit

public double[] fit(double[] guess)

Get the coefficients of the Chebyshev polynomial fitting the weighted data points. The degree of the fitting polynomial is guess.length - 1.

Parameters:

guess - First guess for the coefficients. They must be sorted in increasing order of the polynomial's degree.

Returns:

the coefficients of the Chebyshev polynomial that best fits the observed points

Throws:

ConvergenceException - if the algorithm failed to converge.