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NOX_StatusTest_SgnChange.C
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NOX_StatusTest_SgnChange.C
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#include <Solver/Nox/NOX_StatusTest_SgnChange.H>
#include "NOX_Common.H"
#include "NOX_LAPACK_Group.H"
#include "NOX_Abstract_Vector.H"
#include "NOX_Abstract_Group.H"
NOX::StatusTest::SgnChange::SgnChange(double tol) :
_tol(tol),
_status(NOX::StatusTest::Unevaluated),
_numSignChanges(0),
_firstCall(true),
_dimSys(0)
{
}
NOX::StatusTest::SgnChange::~SgnChange()
{
}
void NOX::StatusTest::SgnChange::initialize(const NOX::Solver::Generic& problem)
{
_dimSys = problem.getSolutionGroup().getX().length();
_x0=Teuchos::rcp(new NOX::LAPACK::Vector(_dimSys));
_x1=Teuchos::rcp(new NOX::LAPACK::Vector(_dimSys));
_f0=Teuchos::rcp(new NOX::LAPACK::Vector(_dimSys));
_f1=Teuchos::rcp(new NOX::LAPACK::Vector(_dimSys));
_firstCall=false;
}
NOX::StatusTest::StatusType NOX::StatusTest::SgnChange::checkStatus(const NOX::Solver::Generic& problem, NOX::StatusTest::CheckType checkType)
{
if(_firstCall) initialize(problem);
std::vector<bool> fSignChange(_dimSys, false);
Teuchos::RCP<NOX::LAPACK::Group> grp=Teuchos::rcp(new NOX::LAPACK::Group(dynamic_cast<const NOX::LAPACK::Group&>(problem.getSolutionGroup())));//(problem.getSolutionGroup());//solutiongroup is constant, thus we need to assign it to be able to modify it.//throws an error if used in conjunction with lapack
*_x1=*_x0=grp->getX();
grp->computeF();
*_f0=grp->getF();
for (int i=0;i<_dimSys;i++){
// compute F at x1=x0+2*eps*e_i and save in f1
(*_x1)(i)=std::nextafter(std::nextafter((*_x1)(i),std::numeric_limits<double>::max()),std::numeric_limits<double>::max());
grp->setX(*_x1);
grp->computeF();
*_f1=grp->getF();
// compare
for(int j=0;j<_dimSys;j++){
if ((*_f0)(j)*(*_f1)(j)<=0.0){
fSignChange[j]= true;
}
}
(*_x1)(i)=(*_x0)(i);
// do the same for x0-2*eps*e_i
(*_x1)(i)=std::nextafter(std::nextafter((*_x1)(i),-std::numeric_limits<double>::max()),-std::numeric_limits<double>::max());
grp->setX(*_x1);
grp->computeF();
*_f1=grp->getF();
// compare
for(int j=0;j<_dimSys;j++){
if ((*_f0)(j)*(*_f1)(j)<=0.0){
fSignChange[j]= true;
}
}
(*_x1)(i)=(*_x0)(i);
}
_numSignChanges=std::count(fSignChange.begin(), fSignChange.end(), true);
grp->setX(*_x0);
grp->computeF();
//return converged, if all entries of fSignChange are true, unconverged otherwise.//only available in C++-11//alternative: use _numSignChanges==_dimSys as criteria instead.
_status = (std::all_of(fSignChange.begin(),fSignChange.end(),[](bool a){return a;})) ? NOX::StatusTest::Converged : NOX::StatusTest::Unconverged;
return _status;
}
NOX::StatusTest::StatusType NOX::StatusTest::SgnChange::getStatus() const
{
return _status;
}
std::ostream& NOX::StatusTest::SgnChange::print(std::ostream& stream, int indent) const
{
for (int j = 0; j < indent; j ++)
stream << ' ';
stream << _status;
stream << "Found sign changes in " << _numSignChanges;
stream << " out of " << _dimSys;
stream << " components.";
stream << std::endl;
return stream;
}