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/*
SPDX-FileCopyrightText: 2007 Vladimir Kuznetsov <ks.vladimir@gmail.com>
SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "gslsolver.h"
#ifdef STEPCORE_WITH_GSL
#include "util.h"
#include <cstring>
#include <cmath>
namespace StepCore
{
STEPCORE_META_OBJECT(GslGenericSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslGenericSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "GSL generic solver"), MetaObject::ABSTRACT, STEPCORE_SUPER_CLASS(Solver),)
STEPCORE_META_OBJECT(GslSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "GSL non-adaptive solver"), MetaObject::ABSTRACT,
STEPCORE_SUPER_CLASS(GslGenericSolver),)
STEPCORE_META_OBJECT(GslAdaptiveSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "GSL adaptive solver"), MetaObject::ABSTRACT,
STEPCORE_SUPER_CLASS(GslGenericSolver),)
STEPCORE_META_OBJECT(GslRK2Solver, QT_TRANSLATE_NOOP("ObjectClass", "GslRK2Solver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta second-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRK2Solver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRK2Solver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta second-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
STEPCORE_META_OBJECT(GslRK4Solver, QT_TRANSLATE_NOOP("ObjectClass", "GslRK4Solver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta classical fourth-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRK4Solver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRK4Solver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta classical fourth-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
STEPCORE_META_OBJECT(GslRKF45Solver, QT_TRANSLATE_NOOP("ObjectClass", "GslRKF45Solver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta-Fehlberg (4,5) solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRKF45Solver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRKF45Solver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta-Fehlberg (4,5) solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
STEPCORE_META_OBJECT(GslRKCKSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslRKCKSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta Cash-Karp (4,5) solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRKCKSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRKCKSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta Cash-Karp (4,5) solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
STEPCORE_META_OBJECT(GslRK8PDSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslRK8PDSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta Prince-Dormand (8,9) solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRK8PDSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRK8PDSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta Prince-Dormand (8,9) solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
STEPCORE_META_OBJECT(GslRK2IMPSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslRK2IMPSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta implicit second-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRK2IMPSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRK2IMPSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta implicit second-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
STEPCORE_META_OBJECT(GslRK4IMPSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslRK4IMPSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Runge-Kutta implicit fourth-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslSolver),)
STEPCORE_META_OBJECT(GslAdaptiveRK4IMPSolver, QT_TRANSLATE_NOOP("ObjectClass", "GslAdaptiveRK4IMPSolver"), QT_TRANSLATE_NOOP("ObjectDescription", "Adaptive Runge-Kutta implicit fourth-order solver from GSL library"),
0, STEPCORE_SUPER_CLASS(GslAdaptiveSolver),)
void GslGenericSolver::init()
{
_yerr.resize(_dimension);
_ytemp.resize(_dimension);
_ydiff.resize(_dimension);
_dydt_in.resize(_dimension);
_dydt_out.resize(_dimension);
_gslStep = gsl_odeiv_step_alloc(_gslStepType, _dimension);
STEPCORE_ASSERT_NOABORT(nullptr != _gslStep);
_gslSystem.function = gslFunction;
_gslSystem.jacobian = nullptr;
_gslSystem.dimension = _dimension;
_gslSystem.params = this;
if(_adaptive) {
_gslControl = gsl_odeiv_control_y_new(_toleranceAbs, _toleranceRel);
STEPCORE_ASSERT_NOABORT(nullptr != _gslControl);
_gslEvolve = gsl_odeiv_evolve_alloc(_dimension);
STEPCORE_ASSERT_NOABORT(nullptr != _gslEvolve);
} else {
_gslControl = nullptr;
_gslEvolve = nullptr;
}
}
void GslGenericSolver::fini()
{
if(_gslStep != nullptr) gsl_odeiv_step_free(_gslStep);
if(_gslControl != nullptr) gsl_odeiv_control_free(_gslControl);
if(_gslEvolve != nullptr) gsl_odeiv_evolve_free(_gslEvolve);
}
int GslGenericSolver::gslFunction(double t, const double* y, double* f, void* params)
{
GslGenericSolver* s = static_cast<GslGenericSolver*>(params);
return s->_function(t, y, nullptr, f, nullptr, s->_params);
}
int GslGenericSolver::doCalcFn(double* t, const VectorXd* y,
const VectorXd* yvar, VectorXd* f, VectorXd* fvar)
{
//int ret = GSL_ODEIV_FN_EVAL(&_gslSystem, *t, y, _ydiff);
int ret = _function(*t, y->data(), yvar?yvar->data():nullptr, f ? f->data() : _ydiff.data(),
fvar?fvar->data():nullptr, _params);
//if(f != NULL) std::memcpy(f, _ydiff, _dimension*sizeof(*f));
return ret;
//_hasSavedState = true;
}
int GslGenericSolver::doEvolve(double* t, double t1, VectorXd* y, VectorXd* yvar)
{
STEPCORE_ASSERT_NOABORT(*t + _stepSize != *t);
STEPCORE_ASSERT_NOABORT(*t != t1);
//STEPCORE_ASSERT_NOABORT(_dimension != 0);
/*
if(_hasSavedState) {
std::memcpy(_ydiff_in, _ydiff_out, _dimension*sizeof(*_ydiff_in));
} else {
GSL_ODEIV_FN_EVAL(&_gslSystem, *t, y, _ydiff_in);
_hasSavedState = true;
}
*/
int gsl_result;
_ytemp = *y;
if(!_adaptive) {
gsl_result = GSL_ODEIV_FN_EVAL(&_gslSystem, *t, y->data(), _dydt_in.data());
if(gsl_result != 0) return gsl_result;
}
while(*t < t1) {
double tt = *t;
if(_adaptive) {
gsl_odeiv_evolve_reset(_gslEvolve); // XXX
gsl_result = gsl_odeiv_evolve_apply(_gslEvolve, _gslControl, _gslStep, &_gslSystem,
&tt, t1, &_stepSize, _ytemp.data());
_yerr = VectorXd::Map(_gslEvolve->yerr, _dimension);
} else {
STEPCORE_ASSERT_NOABORT(t1-tt > _stepSize/100);
gsl_result = gsl_odeiv_step_apply(_gslStep, tt, (_stepSize < t1-tt ? _stepSize : t1-tt),
_ytemp.data(), _yerr.data(), _dydt_in.data(),
_dydt_out.data(), &_gslSystem);
tt = _stepSize < t1-tt ? tt + _stepSize : t1;
}
if(gsl_result != 0) return gsl_result;
// XXX: Do we need to check it ?
_localError = 0;
_localErrorRatio = 0;
for(int i=0; i<_dimension; ++i) {
double error = fabs(_yerr[i]);
if(error > _localError) _localError = error;
double errorRatio = error / (_toleranceAbs + _toleranceRel * fabs(_ytemp[i]));
if(errorRatio > _localErrorRatio) _localErrorRatio = errorRatio;
}
if(_localErrorRatio > 1.1) return ToleranceError;
*t = tt;
*y = _ytemp;
if(!_adaptive) _dydt_in = _dydt_out;
}
return OK;
}
} // namespace StepCore
#endif // STEPCORE_WITH_GSL
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