Package com.titan.math.solver

Class AdamsBashforth2ndOrderSolver

java.lang.Object

com.titan.math.solver.AdamsBashforth2ndOrderSolver

All Implemented Interfaces:

Solver

public class AdamsBashforth2ndOrderSolver
extends Object
implements Solver

Implementation of the Adams-Bashforth 2nd order solver approximation method
wi+1 = wi + (h/2)*(3*f(ti, wi) - f(t-1, w-1))

Constructor Summary

Constructors

Constructor	Description
AdamsBashforth2ndOrderSolver()

Method Summary

Modifier and Type	Method	Description
void	setIsFirstIteration(boolean isFirstIteration)	sets the isFirstIteration variable to a specified boolean value
void	setPreviousState(Vector[] state)	sets the previous state to a specified state vector
Vector[]	solve(Function f, Vector positions, Vector velocities, Vector masses, double h, double t)	takes one step forward and calculates the state of the solar system using the Adams-Bashforth 2nd order method

Methods inherited from class java.lang.Object

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

Constructor Details

AdamsBashforth2ndOrderSolver

public AdamsBashforth2ndOrderSolver()

Method Details

setIsFirstIteration

public void setIsFirstIteration(boolean isFirstIteration)

sets the isFirstIteration variable to a specified boolean value

Parameters:

isFirstIteration - boolean value for the isFirstIteration

setPreviousState

public void setPreviousState(Vector[] state)

sets the previous state to a specified state vector

Parameters:

state - a vector of the state of a celestial object, consisting its positions and velocities

solve

public Vector[] solve(Function f,
 Vector positions,
 Vector velocities,
 Vector masses,
 double h,
 double t)

takes one step forward and calculates the state of the solar system using the Adams-Bashforth 2nd order method

Specified by:

solve in interface Solver

Parameters:

f - Function that is used to estimate the next step

positions - positions of celestial bodies in the system

velocities - velocities of celestial bodies in the system

masses - masses of celestial bodies in the system

h - step-size

t - time step we are currently on

Returns:

returns the state of the system after one step