uk.ac.starlink.diva.interp

Class LinearInterp

java.lang.Object

uk.ac.starlink.diva.interp.AbstractInterpolator

uk.ac.starlink.diva.interp.LinearInterp

All Implemented Interfaces:

Interpolator

Direct Known Subclasses:

AkimaSplineInterp, CubicSplineInterp, HermiteSplineInterp, PolynomialInterp

public class LinearInterp
extends AbstractInterpolator

Interpolate values using a linear scheme.

Version:

$Id$

Author:

Peter W. Draper

Field Summary

Fields inherited from class uk.ac.starlink.diva.interp.AbstractInterpolator

c, decr, x, y

Constructor Summary

Constructors

Constructor and Description
LinearInterp() Create an instance with no coordinates.
LinearInterp(double[] x, double[] y) Create an instance with the given coordinates.

Method Summary

Modifier and Type	Method and Description
int	guessStep()
double	interpolate(double xp) Return the interpolated value corresponding to some arbitrary X coordinate.
static void	main(String[] args) Simple test entry point

Methods inherited from class uk.ac.starlink.diva.interp.AbstractInterpolator

appendValue, binarySearch, evalYData, evalYDataArray, getCount, getXCoord, getXCoords, getYCoord, getYCoords, isFull, isIncreasing, setCoords, stepGuess

Methods inherited from class java.lang.Object

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

Constructor Detail

LinearInterp

public LinearInterp()

Create an instance with no coordinates. A call to setValues must be made before any other methods.

LinearInterp

public LinearInterp(double[] x,
                    double[] y)

Create an instance with the given coordinates. Interpolation is by X coordinate see the interpolate method. The X coordinates should be monotonic, either increasing or decreasing. Same value X coordinates are not allowed.

Parameters:

x - the X coordinates.

y - the Y coordinates.

Method Detail

interpolate

public double interpolate(double xp)

Description copied from interface: Interpolator

Return the interpolated value corresponding to some arbitrary X coordinate.

Specified by:

interpolate in interface Interpolator

Specified by:

interpolate in class AbstractInterpolator

Parameters:

xp - the X coordinate at which an interpolated Y coordinate is required.

Returns:

the interpolated value.

guessStep

public int guessStep()

main

public static void main(String[] args)

Simple test entry point