Package org.shredzone.commons.suncalc.util

Class QuadraticInterpolation

java.lang.Object

org.shredzone.commons.suncalc.util.QuadraticInterpolation

public class QuadraticInterpolation
extends Object

Calculates the roots and extremum of a quadratic equation.

Constructor Summary

Constructors

Constructor	Description
QuadraticInterpolation(double yMinus, double y0, double yPlus)	Creates a new quadratic equation.

Method Summary

Modifier and Type	Method	Description
int	getNumberOfRoots()	Returns the number of roots found in [-1 ..
double	getRoot1()	Returns the first root that was found.
double	getRoot2()	Returns the second root that was found.
double	getXe()	Returns X of extremum.
double	getYe()	Returns the Y value at the extremum.
boolean	isMaximum()	Returns whether the extremum is a minimum or a maximum.

Methods inherited from class java.lang.Object

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

Constructor Details

QuadraticInterpolation

public QuadraticInterpolation(double yMinus,
 double y0,
 double yPlus)

Creates a new quadratic equation.

Parameters:

yMinus - y at x == -1

y0 - y at x == 0

yPlus - y at x == 1

Method Details

getXe

public double getXe()

Returns X of extremum. Can be outside [-1 .. 1].

Returns:

X

getYe

public double getYe()

Returns the Y value at the extremum.

Returns:

Y

getRoot1

public double getRoot1()

Returns the first root that was found.

Returns:

X of first root

getRoot2

public double getRoot2()

Returns the second root that was found.

Returns:

X of second root

getNumberOfRoots

public int getNumberOfRoots()

Returns the number of roots found in [-1 .. 1].

Returns:

Number of roots

isMaximum

public boolean isMaximum()

Returns whether the extremum is a minimum or a maximum.

Returns:

true: Extremum at xe is a maximum. false: Extremum at xe is a minimum.