Package org.esa.snap.core.datamodel

Class RationalFunctionModel

java.lang.Object
org.esa.snap.core.datamodel.RationalFunctionModel
All Implemented Interfaces:
Cloneable
public class RationalFunctionModel extends Object implements Cloneable
Class for approximating a function of two variables with a rational function.
Version:
$Revision$ $Date$

  • Constructor Summary

    Constructors
    Constructor
    Description
    RationalFunctionModel(int degreeP, int degreeQ, double[] x, double[] y, double[] g)
    Constructs a rational function model for approximating a function g(x, y) with a rational function R(x, y) = P(x, y) / Q(x, y) where P and Q are polynomials of up to 4th degree.

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    createCFunctionCode(String compute_x, String lat, String lon)
     
    double
    getMaxError()
    Returns the maximum error of the approximation.
    double
    getRmse()
    Returns the root mean square error (RMSE) of the approximation.
    static int
    getTermCountP(int degreeP)
     
    static int
    getTermCountQ(int degreeQ)
     
    double
    getValue(double x, double y)
    Returns the rational function value approximating g(x, y).

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • RationalFunctionModel

      public RationalFunctionModel(int degreeP, int degreeQ, double[] x, double[] y, double[] g)
      Constructs a rational function model for approximating a function g(x, y) with a rational function R(x, y) = P(x, y) / Q(x, y) where P and Q are polynomials of up to 4th degree.
      Parameters:
      degreeP - the degree of the numerator polynomial P.
      degreeQ - the degree of the denominator polynomial Q.
      x - the x-coordinates corresponding to the function values being approximated.
      y - the y-coordinates corresponding to the function values being approximated.
      g - the function values g(x, y) being approximated.
      Throws:
      IllegalArgumentException - if the degree of the numerator or denominator polynomial is greater than four.
      IllegalArgumentException - if the lengths of x, y, and g are not the same.

  • Method Details

    • getTermCountP

      public static int getTermCountP(int degreeP)

    • getTermCountQ

      public static int getTermCountQ(int degreeQ)

    • getValue

      public double getValue(double x, double y)
      Returns the rational function value approximating g(x, y).
      Parameters:
      x - the x-coordinate.
      y - the y-coordinate.
      Returns:
      the rational function value R(x, y).

    • getRmse

      public double getRmse()
      Returns the root mean square error (RMSE) of the approximation.
      Returns:
      the root mean square error.

    • getMaxError

      public double getMaxError()
      Returns the maximum error of the approximation.
      Returns:
      the maximum error.

    • createCFunctionCode

      public String createCFunctionCode(String compute_x, String lat, String lon)