org.orekit.parameter
Class LinearFunction

java.lang.Object
  org.orekit.parameter.Parameterizable
      org.orekit.parameter.ParamDiffFunction
          org.orekit.parameter.LinearFunction

All Implemented Interfaces:

Serializable, IParamDiffFunction, IParameterizable, IParameterizableFunction

public class LinearFunction
extends ParamDiffFunction

This class is used to define parameterizable linear function a(t -t0) + b.

Since:

2.3

Version:

$Id: LinearFunction.java 12327 2015-02-11 13:43:46Z maggiorani $

Author:

auguief

See Also:

Serialized Form

Concurrency :

not thread-safe, uses internal mutable attributes

Field Summary

static String	A Default function slope name.
static String	B Default ordinate origin name.

Constructor Summary

LinearFunction(AbsoluteDate t0, double slope, double zeroValue)
Simple constructor of a linear function a * (t - t0) + b using input constant a, b and initial date.

LinearFunction(AbsoluteDate t0, Parameter slope, Parameter zeroValue)
Simple constructor of a linear function a * (t - t0) + b using input Parameter and initial date.

Method Summary

double	derivativeValue(Parameter p, SpacecraftState state) Compute the derivative value with respect to the input parameter.
ArrayList<Parameter>	getParameters() Get the supported parameters.
double	value(SpacecraftState s) Getting the value of the function.

Methods inherited from class org.orekit.parameter.ParamDiffFunction

isDifferentiableBy, supportsParameter

Methods inherited from class org.orekit.parameter.Parameterizable

addParameter

Methods inherited from class java.lang.Object

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

Field Detail

A

public static final String A

Default function slope name.

See Also:

Constant Field Values

B

public static final String B

Default ordinate origin name.

See Also:

Constant Field Values

Constructor Detail

LinearFunction

public LinearFunction(AbsoluteDate t0,
                      Parameter slope,
                      Parameter zeroValue)

Simple constructor of a linear function a * (t - t0) + b using input Parameter and initial date.

Parameters:

t0 - initial date

slope - Function's slope : a

zeroValue - Function's value when t=0 : b

LinearFunction

public LinearFunction(AbsoluteDate t0,
                      double slope,
                      double zeroValue)

Simple constructor of a linear function a * (t - t0) + b using input constant a, b and initial date.

Parameters:

t0 - initial date

slope - Function's slope : a

zeroValue - Function's value when t=0 : b

Method Detail

value

public double value(SpacecraftState s)

Getting the value of the function.

Parameters:

s - the spacecraft state

Returns:

the value of the function.

derivativeValue

public double derivativeValue(Parameter p,
                              SpacecraftState state)

Compute the derivative value with respect to the input parameter.

Parameters:

p - parameter

state - current state

Returns:

the derivative value

getParameters

public ArrayList<Parameter> getParameters()

Get the supported parameters.

Specified by:

getParameters in interface IParameterizable

Overrides:

getParameters in class Parameterizable

Returns:

list of supported parameters