spring
Class SpringEquation

java.lang.Object

  spring.SpringEquation

All Implemented Interfaces:

Equation

public class SpringEquation

extends java.lang.Object

implements Equation

Spring equation with two monotonic functions in place of damping and stiffness.

dx/dt = v

dv/dt = -f(x)-g(v)

Author:

A.K.Nircan

Field Summary

(package private) Monotonic	f
(package private) java.util.Map	fvg
(package private) Monotonic	g

Constructor Summary

SpringEquation(Monotonic f, Monotonic g)
Constructor with two monotonic functions: f(x) and g(v).

Method Summary

double[]	derivs(double x, double[] y) Returns derivatives using x and y
int	getNVar()

Methods inherited from class java.lang.Object

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

Field Detail

f

Monotonic f

g

Monotonic g

fvg

java.util.Map fvg

Constructor Detail

SpringEquation

public SpringEquation(Monotonic f,
                      Monotonic g)

Constructor with two monotonic functions: f(x) and g(v). Here x is displacement and v is velocity.

Parameters:

f -

g -

Method Detail

derivs

public double[] derivs(double x,
                       double[] y)

Description copied from interface: Equation

Returns derivatives using x and y

Specified by:

derivs in interface Equation

Parameters:

x -

y - is variables

Returns:

derivatives

getNVar

public int getNVar()

Specified by:

getNVar in interface Equation

Returns:

number of variables