org.hipparchus.fitting

Class SimpleCurveFitter

java.lang.Object

org.hipparchus.fitting.AbstractCurveFitter

org.hipparchus.fitting.SimpleCurveFitter

public class SimpleCurveFitter
extends AbstractCurveFitter

Fits points to a user-defined function.

Nested Class Summary

Nested classes/interfaces inherited from class org.hipparchus.fitting.AbstractCurveFitter

AbstractCurveFitter.TheoreticalValuesFunction

Method Summary

Modifier and Type	Method and Description
static SimpleCurveFitter	create(ParametricUnivariateFunction f, double[] start) Creates a curve fitter.
protected LeastSquaresProblem	getProblem(Collection<WeightedObservedPoint> observations) Creates a least squares problem corresponding to the appropriate curve.
SimpleCurveFitter	withMaxIterations(int newMaxIter) Configure the maximum number of iterations.
SimpleCurveFitter	withStartPoint(double[] newStart) Configure the start point (initial guess).

Methods inherited from class org.hipparchus.fitting.AbstractCurveFitter

fit, getOptimizer

Methods inherited from class java.lang.Object

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

Method Detail

create

public static SimpleCurveFitter create(ParametricUnivariateFunction f,
                                       double[] start)

Creates a curve fitter. The maximum number of iterations of the optimization algorithm is set to Integer.MAX_VALUE.

Parameters:

f - Function to fit.

start - Initial guess for the parameters. Cannot be null. Its length must be consistent with the number of parameters of the function to fit.

Returns:

a curve fitter.

See Also:

withStartPoint(double[]), withMaxIterations(int)

withStartPoint

public SimpleCurveFitter withStartPoint(double[] newStart)

Configure the start point (initial guess).

Parameters:

newStart - new start point (initial guess)

Returns:

a new instance.

withMaxIterations

public SimpleCurveFitter withMaxIterations(int newMaxIter)

Configure the maximum number of iterations.

Parameters:

newMaxIter - maximum number of iterations

Returns:

a new instance.

getProblem

protected LeastSquaresProblem getProblem(Collection<WeightedObservedPoint> observations)

Creates a least squares problem corresponding to the appropriate curve.

Specified by:

getProblem in class AbstractCurveFitter

Parameters:

observations - Sample points.

Returns:

the least squares problem to use for fitting the curve to the given points.