Stokhos Package Browser (Single Doxygen Collection) Version of the Day
Loading...
Searching...
No Matches
Stokhos_MPMeanBasedPreconditioner.cpp
Go to the documentation of this file.
1// @HEADER
2// ***********************************************************************
3//
4// Stokhos Package
5// Copyright (2009) Sandia Corporation
6//
7// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
8// license for use of this work by or on behalf of the U.S. Government.
9//
10// Redistribution and use in source and binary forms, with or without
11// modification, are permitted provided that the following conditions are
12// met:
13//
14// 1. Redistributions of source code must retain the above copyright
15// notice, this list of conditions and the following disclaimer.
16//
17// 2. Redistributions in binary form must reproduce the above copyright
18// notice, this list of conditions and the following disclaimer in the
19// documentation and/or other materials provided with the distribution.
20//
21// 3. Neither the name of the Corporation nor the names of the
22// contributors may be used to endorse or promote products derived from
23// this software without specific prior written permission.
24//
25// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
26// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
29// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
30// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
31// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
32// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
33// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
34// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
35// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36//
37// Questions? Contact Eric T. Phipps (etphipp@sandia.gov).
38//
39// ***********************************************************************
40// @HEADER
41
43#include "EpetraExt_BlockMultiVector.h"
44
47 const Teuchos::RCP<const EpetraExt::MultiComm>& mp_comm_,
48 int num_mp_blocks_,
49 const Teuchos::RCP<const Epetra_Map>& base_map_,
50 const Teuchos::RCP<const Epetra_Map>& mp_map_,
51 const Teuchos::RCP<Stokhos::AbstractPreconditionerFactory>& prec_factory_,
52 const Teuchos::RCP<Teuchos::ParameterList>& params_) :
53 label("Stokhos MP Block Diagonal Preconditioner"),
54 mp_comm(mp_comm_),
55 num_mp_blocks(num_mp_blocks_),
56 base_map(base_map_),
57 mp_map(mp_map_),
58 prec_factory(prec_factory_),
59 mean_prec(),
60 useTranspose(false)
61{
62}
63
66{
67}
68
69void
71setupPreconditioner(const Teuchos::RCP<Stokhos::BlockDiagonalOperator>& mp_op,
72 const Epetra_Vector& x)
73{
74 TEUCHOS_TEST_FOR_EXCEPTION(prec_factory == Teuchos::null, std::logic_error,
75 "Error! setupPreconditioner() cannot be called when " <<
76 "prec_factory is null!" << std::endl);
77
78 Teuchos::RCP<Stokhos::ProductContainer<Epetra_Operator> > mp_ops =
79 mp_op->getMPOps();
80 mean_prec = prec_factory->compute(mp_ops->getCoeffPtr(0));
81 if (num_mp_blocks > 0) {
82 label = std::string("Stokhos MP Mean Preconditioner:\n") +
83 std::string(" ***** ") +
84 std::string(mean_prec->Label());
85 }
86}
87
88int
90SetUseTranspose(bool UseTheTranspose)
91{
92 useTranspose = UseTheTranspose;
93 mean_prec->SetUseTranspose(useTranspose);
94
95 return 0;
96}
97
98int
100Apply(const Epetra_MultiVector& Input, Epetra_MultiVector& Result) const
101{
102 EpetraExt::BlockMultiVector mp_input(View, *base_map, Input);
103 EpetraExt::BlockMultiVector mp_result(View, *base_map, Result);
104 for (int i=0; i<num_mp_blocks; i++) {
105 mean_prec->Apply(*(mp_input.GetBlock(i)), *(mp_result.GetBlock(i)));
106 }
107
108 return 0;
109}
110
111int
113ApplyInverse(const Epetra_MultiVector& Input, Epetra_MultiVector& Result) const
114{
115 EpetraExt::BlockMultiVector mp_input(View, *base_map, Input);
116 EpetraExt::BlockMultiVector mp_result(View, *base_map, Result);
117 for (int i=0; i<num_mp_blocks; i++) {
118 mean_prec->ApplyInverse(*(mp_input.GetBlock(i)), *(mp_result.GetBlock(i)));
119 }
120
121 return 0;
122}
123
124double
126NormInf() const
127{
128 return mean_prec->NormInf();
129}
130
131
132const char*
134Label () const
135{
136 return const_cast<char*>(label.c_str());
137}
138
139bool
141UseTranspose() const
142{
143 return useTranspose;
144}
145
146bool
148HasNormInf() const
149{
150 return mean_prec->HasNormInf();
151}
152
153const Epetra_Comm &
155Comm() const
156{
157 return *mp_comm;
158}
159const Epetra_Map&
161OperatorDomainMap() const
162{
163 return *mp_map;
164}
165
166const Epetra_Map&
168OperatorRangeMap() const
169{
170 return *mp_map;
171}
virtual int Apply(const Epetra_MultiVector &Input, Epetra_MultiVector &Result) const
Returns the result of a Epetra_Operator applied to a Epetra_MultiVector Input in Result as described ...
virtual int SetUseTranspose(bool UseTranspose)
Set to true if the transpose of the operator is requested.
virtual int ApplyInverse(const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
Returns the result of the inverse of the operator applied to a Epetra_MultiVector Input in Result as ...
virtual double NormInf() const
Returns an approximate infinity norm of the operator matrix.
virtual void setupPreconditioner(const Teuchos::RCP< Stokhos::BlockDiagonalOperator > &mp_op, const Epetra_Vector &x)
Setup preconditioner.
virtual bool HasNormInf() const
Returns true if the this object can provide an approximate Inf-norm, false otherwise.
virtual const Epetra_Map & OperatorRangeMap() const
Returns the Epetra_Map object associated with the range of this matrix operator.
virtual bool UseTranspose() const
Returns the current UseTranspose setting.
virtual const char * Label() const
Returns a character string describing the operator.
virtual const Epetra_Comm & Comm() const
Returns a reference to the Epetra_Comm communicator associated with this operator.
virtual const Epetra_Map & OperatorDomainMap() const
Returns the Epetra_Map object associated with the domain of this matrix operator.
MPMeanBasedPreconditioner(const Teuchos::RCP< const EpetraExt::MultiComm > &mp_comm, int num_mp_blocks, const Teuchos::RCP< const Epetra_Map > &base_map, const Teuchos::RCP< const Epetra_Map > &mp_map, const Teuchos::RCP< Stokhos::AbstractPreconditionerFactory > &prec_factory, const Teuchos::RCP< Teuchos::ParameterList > &params)
Constructor.