fr.cnes.sirius.patrius.propagation.analytical.twod

Class DateIntervalParabolicFunction

java.lang.Object

fr.cnes.sirius.patrius.propagation.analytical.twod.AbstractDateIntervalFunction

fr.cnes.sirius.patrius.propagation.analytical.twod.DateIntervalParabolicFunction

All Implemented Interfaces:

UnivariateDateFunction

public class DateIntervalParabolicFunction
extends AbstractDateIntervalFunction

This class represents a piecewise 2nd order polynomial function of date.
The function is defined by an initial condition (x0, xDot0) at a date t[0] and all second derivatives xDotDot[i] on intervals [t[i],t[i+1]]. For date out of bounds, 2nd derivative is considered as zero.

Since:

3.0

Version:

$Id: DateIntervalParabolicFunction.java 17582 2017-05-10 12:58:16Z bignon $

Author:

Emmanuel Bignon

Concurrency :

thread-safe

Constructor Summary

Constructors

Constructor and Description
DateIntervalParabolicFunction(DateIntervalParabolicFunction function) Clone constructor.
DateIntervalParabolicFunction(double ax0, double axDot0, AbsoluteDate[] timeIntervals, double[] axDotDotIntervals) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
double	getX0() Returns value at first date.
double	getxDot0() Returns first derivative value at first date.
double[]	getxDotDotIntervals() Returns a copy of 1st order derivatives on date intervals.
double	value(AbsoluteDate t) Returns value of function at provided date.

Methods inherited from class fr.cnes.sirius.patrius.propagation.analytical.twod.AbstractDateIntervalFunction

getDateIntervals, getIndexInterval

Methods inherited from class java.lang.Object

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

Constructor Detail

DateIntervalParabolicFunction

public DateIntervalParabolicFunction(double ax0,
                             double axDot0,
                             AbsoluteDate[] timeIntervals,
                             double[] axDotDotIntervals)

Constructor.

Parameters:

ax0 - value at first date t[0]

axDot0 - 1st derivative at first date t[0]

timeIntervals - date intervals (must be chronologically sorted)

axDotDotIntervals - 2nd order derivatives on date intervals (size of vector must be of timeIntervals size - 1)

DateIntervalParabolicFunction

public DateIntervalParabolicFunction(DateIntervalParabolicFunction function)

Clone constructor.

Parameters:

function - function to copy

Method Detail

getX0

public double getX0()

Returns value at first date.

Returns:

x0 value at first date

getxDot0

public double getxDot0()

Returns first derivative value at first date.

Returns:

first derivative value at first date

getxDotDotIntervals

public double[] getxDotDotIntervals()

Returns a copy of 1st order derivatives on date intervals.

Returns:

1st order derivatives on date intervals

value

public double value(AbsoluteDate t)

Returns value of function at provided date.

Parameters:

t - a date

Returns:

value of function at provided date