本文整理汇总了C++中eigen::SparseMatrix::topLeftCorner方法的典型用法代码示例。如果您正苦于以下问题：C++ SparseMatrix::topLeftCorner方法的具体用法？C++ SparseMatrix::topLeftCorner怎么用？C++ SparseMatrix::topLeftCorner使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类eigen::SparseMatrix的用法示例。
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示例1: dx
/// Solve the linear system Ax = b, with A being the
/// combined derivative matrix of the residual and b
/// being the residual itself.
/// \param[in] residual residual object containing A and b.
/// \return the solution x
NewtonIterationBlackoilCPR::SolutionVector
NewtonIterationBlackoilCPR::computeNewtonIncrement(const LinearisedBlackoilResidual& residual) const
{
// Build the vector of equations.
const int np = residual.material_balance_eq.size();
std::vector<ADB> eqs;
eqs.reserve(np + 2);
for (int phase = 0; phase < np; ++phase) {
eqs.push_back(residual.material_balance_eq[phase]);
}
// check if wells are present
const bool hasWells = residual.well_flux_eq.size() > 0 ;
std::vector<ADB> elim_eqs;
if( hasWells )
{
eqs.push_back(residual.well_flux_eq);
eqs.push_back(residual.well_eq);
// Eliminate the well-related unknowns, and corresponding equations.
elim_eqs.reserve(2);
elim_eqs.push_back(eqs[np]);
eqs = eliminateVariable(eqs, np); // Eliminate well flux unknowns.
elim_eqs.push_back(eqs[np]);
eqs = eliminateVariable(eqs, np); // Eliminate well bhp unknowns.
assert(int(eqs.size()) == np);
}
// Scale material balance equations.
for (int phase = 0; phase < np; ++phase) {
eqs[phase] = eqs[phase] * residual.matbalscale[phase];
}
// Add material balance equations (or other manipulations) to
// form pressure equation in top left of full system.
Eigen::SparseMatrix<double, Eigen::RowMajor> A;
V b;
formEllipticSystem(np, eqs, A, b);
// Scale pressure equation.
const double pscale = 200*unit::barsa;
const int nc = residual.material_balance_eq[0].size();
A.topRows(nc) *= pscale;
b.topRows(nc) *= pscale;
// Solve reduced system.
SolutionVector dx(SolutionVector::Zero(b.size()));
// Create ISTL matrix.
DuneMatrix istlA( A );
// Create ISTL matrix for elliptic part.
DuneMatrix istlAe( A.topLeftCorner(nc, nc) );
// Right hand side.
Vector istlb(istlA.N());
std::copy_n(b.data(), istlb.size(), istlb.begin());
// System solution
Vector x(istlA.M());
x = 0.0;
Dune::InverseOperatorResult result;
#if HAVE_MPI
if(parallelInformation_.type()==typeid(ParallelISTLInformation))
{
typedef Dune::OwnerOverlapCopyCommunication<int,int> Comm;
const ParallelISTLInformation& info =
boost::any_cast<const ParallelISTLInformation&>( parallelInformation_);
Comm istlComm(info.communicator());
Comm istlAeComm(info.communicator());
info.copyValuesTo(istlAeComm.indexSet(), istlAeComm.remoteIndices());
info.copyValuesTo(istlComm.indexSet(), istlComm.remoteIndices(),
istlAe.N(), istlA.N()/istlAe.N());
// Construct operator, scalar product and vectors needed.
typedef Dune::OverlappingSchwarzOperator<Mat,Vector,Vector,Comm> Operator;
Operator opA(istlA, istlComm);
constructPreconditionerAndSolve<Dune::SolverCategory::overlapping>(opA, istlAe, x, istlb, istlComm, istlAeComm, result);
}
else
#endif
{
// Construct operator, scalar product and vectors needed.
typedef Dune::MatrixAdapter<Mat,Vector,Vector> Operator;
Operator opA(istlA);
Dune::Amg::SequentialInformation info;
constructPreconditionerAndSolve(opA, istlAe, x, istlb, info, info, result);
}
// store number of iterations
iterations_ = result.iterations;
// Check for failure of linear solver.
if (!result.converged && !linear_solver_ignoreconvergencefailure_) {
OPM_THROW(LinearSolverProblem, "Convergence failure for linear solver.");
}
//.........这里部分代码省略.........