PETScPreconditioner.h

Note

The documentation on this page was automatically extracted from the DOLFIN C++ code and may need to be edited or expanded.

class PETScPreconditioner

Parent class(es)

• PETScObject

This class is a wrapper for configuring PETSc preconditioners. It does not own a preconditioner. It can take a PETScKrylovSolver and set the preconditioner type and parameters.

explicit PETScPreconditioner(std::string type="default")

Create a particular preconditioner object

void set(PETScKrylovSolver& solver)

Set the preconditioner type and parameters

void set_nullspace(const VectorSpaceBasis& near_nullspace)

Set the (near) null space of the preconditioner operator (matrix). This is required for certain preconditioner types, e.g. smoothed aggregation multigrid

MatNullSpace near_nullspace() const

Return the PETSc null space

void set_coordinates(const std::vector<double>& x, std::size_t dim)

Set the coordinates of the operator (matrix) rows and geometric dimension d. This is can be used by required for certain preconditioners, e.g. ML. The input for this function can be generated using GenericDofMap::tabulate_all_dofs.

std::string str(bool verbose) const

Return informal string representation (pretty-print)

static std::map<std::string, std::string> preconditioners()

Return a list of available preconditioners

static Parameters default_parameters()

Default parameter values