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MFEM
v3.3.2
Finite element discretization library
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MFEM
v3.3.2
Finite element discretization library
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A class to handle Block diagonal preconditioners in a matrix-free implementation. More...
#include <blockoperator.hpp>
Public Member Functions | |
| BlockDiagonalPreconditioner (const Array< int > &offsets) | |
| Constructor that specifies the block structure. More... | |
| void | SetDiagonalBlock (int iblock, Operator *op) |
| Add a square block op in the block-entry (iblock, iblock). More... | |
| virtual void | SetOperator (const Operator &op) |
| This method is present since required by the abstract base class Solver. More... | |
| int | NumBlocks () const |
| Return the number of blocks. More... | |
| Operator & | GetDiagonalBlock (int iblock) |
| Return a reference to block i,i. More... | |
| Array< int > & | Offsets () |
| Return the offsets for block starts. More... | |
| virtual void | Mult (const Vector &x, Vector &y) const |
| Operator application. More... | |
| virtual void | MultTranspose (const Vector &x, Vector &y) const |
| Action of the transpose operator. More... | |
| ~BlockDiagonalPreconditioner () | |
 Public Member Functions inherited from mfem::Solver | |
| Solver (int s=0, bool iter_mode=false) | |
| Initialize a square Solver with size s. More... | |
| Solver (int h, int w, bool iter_mode=false) | |
| Initialize a Solver with height h and width w. More... | |
| Public Member Functions inherited from mfem::Operator | |
| Operator (int s=0) | |
| Construct a square Operator with given size s (default 0). More... | |
| Operator (int h, int w) | |
| Construct an Operator with the given height (output size) and width (input size). More... | |
| int | Height () const |
| Get the height (size of output) of the Operator. Synonym with NumRows(). More... | |
| int | NumRows () const |
| Get the number of rows (size of output) of the Operator. Synonym with Height(). More... | |
| int | Width () const |
| Get the width (size of input) of the Operator. Synonym with NumCols(). More... | |
| int | NumCols () const |
| Get the number of columns (size of input) of the Operator. Synonym with Width(). More... | |
| virtual Operator & | GetGradient (const Vector &x) const |
| Evaluate the gradient operator at the point x. The default behavior in class Operator is to generate an error. More... | |
| virtual const Operator * | GetProlongation () const |
Prolongation operator from linear algebra (linear system) vectors, to input vectors for the operator. NULL means identity. More... | |
| virtual const Operator * | GetRestriction () const |
Restriction operator from input vectors for the operator to linear algebra (linear system) vectors. NULL means identity. More... | |
| void | FormLinearSystem (const Array< int > &ess_tdof_list, Vector &x, Vector &b, Operator *&A, Vector &X, Vector &B, int copy_interior=0) |
| Form a constrained linear system using a matrix-free approach. More... | |
| virtual void | RecoverFEMSolution (const Vector &X, const Vector &b, Vector &x) |
| Reconstruct a solution vector x (e.g. a GridFunction) from the solution X of a constrained linear system obtained from Operator::FormLinearSystem(). More... | |
| void | PrintMatlab (std::ostream &out, int n=0, int m=0) const |
| Prints operator with input size n and output size m in Matlab format. More... | |
| virtual | ~Operator () |
| Virtual destructor. More... | |
Public Attributes | |
| int | owns_blocks |
| Public Attributes inherited from mfem::Solver | |
| bool | iterative_mode |
| If true, use the second argument of Mult() as an initial guess. More... | |
Additional Inherited Members | |
| Public Types inherited from mfem::Operator | |
| enum | Type { MFEM_SPARSEMAT, Hypre_ParCSR, PETSC_MATAIJ, PETSC_MATIS, PETSC_MATSHELL, PETSC_MATNEST, PETSC_MATHYPRE, PETSC_MATGENERIC } |
| Enumeration defining IDs for some classes derived from Operator. More... | |
| Protected Attributes inherited from mfem::Operator | |
| int | height |
| Dimension of the output / number of rows in the matrix. More... | |
| int | width |
| Dimension of the input / number of columns in the matrix. More... | |
A class to handle Block diagonal preconditioners in a matrix-free implementation.
Usage:
If a block is not set, it is assumed to be an identity block.
Definition at line 135 of file blockoperator.hpp.
| mfem::BlockDiagonalPreconditioner::BlockDiagonalPreconditioner | ( | const Array< int > & | offsets | ) |
Constructor that specifies the block structure.
Definition at line 128 of file blockoperator.cpp.
| mfem::BlockDiagonalPreconditioner::~BlockDiagonalPreconditioner | ( | ) |
Definition at line 191 of file blockoperator.cpp.
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inline |
Return a reference to block i,i.
Definition at line 153 of file blockoperator.hpp.
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virtual |
Action of the transpose operator.
Reimplemented from mfem::Operator.
Definition at line 171 of file blockoperator.cpp.
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inline |
Return the number of blocks.
Definition at line 150 of file blockoperator.hpp.
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inline |
Return the offsets for block starts.
Definition at line 157 of file blockoperator.hpp.
| void mfem::BlockDiagonalPreconditioner::SetDiagonalBlock | ( | int | iblock, |
| Operator * | op | ||
| ) |
Add a square block op in the block-entry (iblock, iblock).
iblock: The block will be inserted in location (iblock, iblock). op: the Operator to be inserted.
Definition at line 141 of file blockoperator.cpp.
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inlinevirtual |
This method is present since required by the abstract base class Solver.
Implements mfem::Solver.
Definition at line 147 of file blockoperator.hpp.
| int mfem::BlockDiagonalPreconditioner::owns_blocks |
Controls the ownership of the blocks: if nonzero, BlockDiagonalPreconditioner will delete all blocks that are set (non-NULL); the default value is zero.
Definition at line 170 of file blockoperator.hpp.
1.8.5
