org.apache.commons.math.analysis.interpolation
Class SmoothingPolynomialBicubicSplineInterpolator

java.lang.Object
  org.apache.commons.math.analysis.interpolation.BicubicSplineInterpolator
      org.apache.commons.math.analysis.interpolation.SmoothingPolynomialBicubicSplineInterpolator

All Implemented Interfaces:

BivariateRealGridInterpolator

public class SmoothingPolynomialBicubicSplineInterpolator
extends BicubicSplineInterpolator

Generates a bicubic interpolation function. Prior to generating the interpolating function, the input is smoothed using polynomial fitting.

Since:

2.2

Version:

$Revision: 1003892 $ $Date: 2010-10-02 23:28:56 +0200 (sam. 02 oct. 2010) $

Field Summary

private PolynomialFitter	xFitter Fitter for x.
private PolynomialFitter	yFitter Fitter for y.

Constructor Summary

SmoothingPolynomialBicubicSplineInterpolator()
Default constructor.

SmoothingPolynomialBicubicSplineInterpolator(int degree)

SmoothingPolynomialBicubicSplineInterpolator(int xDegree, int yDegree)

Method Summary

BicubicSplineInterpolatingFunction

interpolate(double[] xval, double[] yval, double[][] fval) Computes an interpolating function for the data set.

Methods inherited from class java.lang.Object

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

Field Detail

xFitter

private final PolynomialFitter xFitter

Fitter for x.

yFitter

private final PolynomialFitter yFitter

Fitter for y.

Constructor Detail

SmoothingPolynomialBicubicSplineInterpolator

public SmoothingPolynomialBicubicSplineInterpolator()

Default constructor. The degree of the fitting polynomials is set to 3.

SmoothingPolynomialBicubicSplineInterpolator

public SmoothingPolynomialBicubicSplineInterpolator(int degree)

Parameters:

degree - Degree of the polynomial fitting functions.

SmoothingPolynomialBicubicSplineInterpolator

public SmoothingPolynomialBicubicSplineInterpolator(int xDegree,
                                                    int yDegree)

Parameters:

xDegree - Degree of the polynomial fitting functions along the x-dimension.

yDegree - Degree of the polynomial fitting functions along the y-dimension.

Method Detail

interpolate

public BicubicSplineInterpolatingFunction interpolate(double[] xval,
                                                      double[] yval,
                                                      double[][] fval)
                                               throws MathException

Computes an interpolating function for the data set.

Specified by:

interpolate in interface BivariateRealGridInterpolator

Overrides:

interpolate in class BicubicSplineInterpolator

Parameters:

xval - All the x-coordinates of the interpolation points, sorted in increasing order.

yval - All the y-coordinates of the interpolation points, sorted in increasing order.

fval - The values of the interpolation points on all the grid knots: fval[i][j] = f(xval[i], yval[j]).

Returns:

a function which interpolates the data set.

Throws:

MathException - if arguments violate assumptions made by the interpolation algorithm.