IFPACK  Development
 All Classes Namespaces Files Functions Variables Enumerations Friends Pages
Ifpack_DiagPreconditioner.cpp
1 /*@HEADER
2 // ***********************************************************************
3 //
4 // Ifpack: Object-Oriented Algebraic Preconditioner Package
5 // Copyright (2002) 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 Michael A. Heroux (maherou@sandia.gov)
38 //
39 // ***********************************************************************
40 //@HEADER
41 */
42 
43 #include "Ifpack_ConfigDefs.h"
44 #include "Ifpack_DiagPreconditioner.h"
45 #include "Epetra_BlockMap.h"
46 #include "Epetra_Map.h"
47 #include "Epetra_MultiVector.h"
48 #include "Epetra_Vector.h"
49 #include "Epetra_Comm.h"
50 
51 // ============================================================================
54  const Epetra_Map& RangeMap,
55  const Epetra_Vector& diag) :
56  UseTranspose_(false),
57  DomainMap_(DomainMap),
58  RangeMap_(RangeMap),
59  diag_(diag)
60 { }
61 
62 // ============================================================================
64 { }
65 
66 
67 // ============================================================================
68 int Ifpack_DiagPreconditioner::Apply(const Epetra_MultiVector& /* X */, Epetra_MultiVector& /* Y */) const
69 {
70  IFPACK_RETURN(-1); // not defined
71 }
72 
73 // ============================================================================
75 {
76  if (X.NumVectors() != Y.NumVectors())
77  IFPACK_CHK_ERR(-1);
78 
79  for (int v = 0; v < X.NumVectors(); ++v)
80  for (int i = 0; i < X.MyLength(); ++i)
81  Y[v][i] = diag_[i] * X[v][i];
83 
84  return(0);
85 }
int ApplyInverse(const Epetra_MultiVector &X, Epetra_MultiVector &Y) const
Ifpack_DiagPreconditioner(const Epetra_Map &DomainMap, const Epetra_Map &RangeMap, const Epetra_Vector &diag)
ctor