org.lcsim.math.interpolation

Class BilinearInterpolator

java.lang.Object

org.lcsim.math.interpolation.BilinearInterpolator

public class BilinearInterpolator
extends Object

A class to provide interpolated values for values determined at discrete points on a 2D grid

Author:

Norman Graf

Field Summary

Fields

Modifier and Type	Field and Description
private double[][]	_val
private double[]	_x
private int	_xDim
private double	_xmax
private double	_xmin
private double[]	_y
private int	_yDim
private double	_ymax
private double	_ymin

Constructor Summary

Constructors

Constructor and Description
BilinearInterpolator(double[] x, double[] y, double[][] z) Creates a new instance of BilinearInterpolator

Method Summary

Methods

Modifier and Type	Method and Description
double	interpolateValueAt(double x, double y) Return the value at an arbitrary x,y point, using bilinear interpolation
(package private) double	polin2(double[] x1a, double[] x2a, double[][] ya, double x1, double x2)
(package private) double	polint(double[] xa, double[] ya, double x)
(package private) double	trueBilinear(double x, double y)

Methods inherited from class java.lang.Object

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

Field Detail

_x

private double[] _x

_xmin

private double _xmin

_xmax

private double _xmax

_xDim

private int _xDim

_y

private double[] _y

_ymin

private double _ymin

_ymax

private double _ymax

_yDim

private int _yDim

_val

private double[][] _val

Constructor Detail

BilinearInterpolator

public BilinearInterpolator(double[] x,
                    double[] y,
                    double[][] z)

Creates a new instance of BilinearInterpolator

Parameters:

x - Array of first independent variable at which values are known

y - Array of second independent variable at which values are known

z - Array of values at the (x,y) points

Method Detail

interpolateValueAt

public double interpolateValueAt(double x,
                        double y)

Return the value at an arbitrary x,y point, using bilinear interpolation

Parameters:

x - the first independent variable

y - the second independent variable

Returns:

the interpolated value at (x,y)

polin2

double polin2(double[] x1a,
            double[] x2a,
            double[][] ya,
            double x1,
            double x2)

polint

double polint(double[] xa,
            double[] ya,
            double x)

trueBilinear

double trueBilinear(double x,
                  double y)