org.orekit.propagation.analytical.twod
Class DateIntervalLinearFunction

java.lang.Object
  org.orekit.propagation.analytical.twod.AbstractDateIntervalFunction
      org.orekit.propagation.analytical.twod.DateIntervalLinearFunction

All Implemented Interfaces:

UnivariateDateFunction

public class DateIntervalLinearFunction
extends AbstractDateIntervalFunction

This class represents a piecewise linear function of date.
The function is defined by an initial condition x0 at a date t[0] and all first derivatives xDot[i] on intervals [t[i],t[i+1]]. For date out of bounds, 1st derivative is considered as zero.

Since:

3.0

Version:

$Id: DateIntervalLinearFunction.java 13151 2015-05-05 13:09:30Z bignon $

Author:

Emmanuel Bignon

Concurrency :

thread-safe

Constructor Summary

DateIntervalLinearFunction(DateIntervalLinearFunction function)
Clone constructor.

DateIntervalLinearFunction(double ax0, AbsoluteDate[] timeIntervals, double[] axDotIntervals)
Constructor.

Method Summary

double	getX0() Returns value at first date.
double[]	getxDotIntervals() 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 org.orekit.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

DateIntervalLinearFunction

public DateIntervalLinearFunction(double ax0,
                                  AbsoluteDate[] timeIntervals,
                                  double[] axDotIntervals)

Constructor.

Parameters:

ax0 - value at first date t[0]

timeIntervals - date intervals (must be chronologically sorted)

axDotIntervals - 1st order derivatives on date intervals (size of vector must be of timeIntervals size - 1)

DateIntervalLinearFunction

public DateIntervalLinearFunction(DateIntervalLinearFunction 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

getxDotIntervals

public double[] getxDotIntervals()

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