Package jline.solvers.fluid

Class LSODAExt

java.lang.Object

odesolver.LSODA

jline.solvers.fluid.LSODAExt

All Implemented Interfaces:

org.apache.commons.math3.ode.FirstOrderIntegrator, org.apache.commons.math3.ode.ODEIntegrator

public class LSODAExt
extends LSODA

Extended LSODA solver that supports configurable maximum internal steps. The upstream lsoda-java library hardcodes mxstep=1000000 inside the lsoda() method, ignoring any reflection-based field setting. This subclass overrides integrate() to call the public lsoda() method directly with the desired mxstep value.

Field Summary

Fields inherited from class odesolver.LSODA

istate, ode, tn, write, y

Constructor Summary

Constructors

Constructor	Description
LSODAExt(double minStep, double maxStep, double rtol, double atol, int meth, int miter, int maxSteps)	Create an LSODAExt solver with configurable max steps.

Method Summary

Modifier and Type	Method	Description
static long	getFirstNegativeIstate()	The first negative istate code observed, or 0 if none.
static long	getIntegrateCallCount()	Total integrate() calls since the last reset.
static long	getNegativeIstateCount()	Calls that returned normally with a negative istate, i.e.
double	integrate(org.apache.commons.math3.ode.FirstOrderDifferentialEquations equations, double t0, double[] y0, double t, double[] yOut)	the ODE integrating method
static void	resetIstateCounters()

Methods inherited from class odesolver.LSODA

addEventHandler, addEventHandler, addStepHandler, clearEventHandlers, clearStepHandlers, FirstOrderSystem, getCurrentSignedStepsize, getCurrentStepStart, getEvaluations, getEventHandlers, getJacobianEvaluations, getMaxComponent, getMaxEvaluations, getName, getStepHandlers, getStepsTaken, getTvec, getYvec, isForceStiff, lsoda, setForceStiff, setMaxEvaluations, setOutputTimes, setStopCondition

Methods inherited from class java.lang.Object

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

Constructor Details

LSODAExt

public LSODAExt(double minStep,
 double maxStep,
 double rtol,
 double atol,
 int meth,
 int miter,
 int maxSteps)

Create an LSODAExt solver with configurable max steps.

Parameters:

minStep - minimum step size (absolute value)

maxStep - maximum step size (absolute value)

rtol - relative tolerance

atol - absolute tolerance

meth - method flag (12 = nonstiff/stiff auto)

miter - iteration method (5 = diagonal Jacobian)

maxSteps - maximum number of internal steps (replaces hardcoded 1000000)

Method Details

getIntegrateCallCount

public static long getIntegrateCallCount()

Total integrate() calls since the last reset.

getNegativeIstateCount

public static long getNegativeIstateCount()

Calls that returned normally with a negative istate, i.e. silent failures.

getFirstNegativeIstate

public static long getFirstNegativeIstate()

The first negative istate code observed, or 0 if none.

resetIstateCounters

public static void resetIstateCounters()

integrate

public double integrate(org.apache.commons.math3.ode.FirstOrderDifferentialEquations equations,
 double t0,
 double[] y0,
 double t,
 double[] yOut)

Description copied from class: LSODA

the ODE integrating method

Specified by:

integrate in interface org.apache.commons.math3.ode.FirstOrderIntegrator

Overrides:

integrate in class LSODA

Parameters:

equations - the definition of the ordinary differential equations

t0 - the initial value of t

y0 - the initial values

t - the output station

yOut - the array used to store the integrating result