Ifpack Package Browser (Single Doxygen Collection)
Development
Main Page
Related Pages
Namespaces
Classes
Files
File List
File Members
All
Classes
Namespaces
Files
Functions
Variables
Typedefs
Enumerations
Enumerator
Friends
Macros
Groups
Pages
src
az_ifpack_precon.c
Go to the documentation of this file.
1
2
/*@HEADER
3
// ***********************************************************************
4
//
5
// Ifpack: Object-Oriented Algebraic Preconditioner Package
6
// Copyright (2002) Sandia Corporation
7
//
8
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
9
// license for use of this work by or on behalf of the U.S. Government.
10
//
11
// Redistribution and use in source and binary forms, with or without
12
// modification, are permitted provided that the following conditions are
13
// met:
14
//
15
// 1. Redistributions of source code must retain the above copyright
16
// notice, this list of conditions and the following disclaimer.
17
//
18
// 2. Redistributions in binary form must reproduce the above copyright
19
// notice, this list of conditions and the following disclaimer in the
20
// documentation and/or other materials provided with the distribution.
21
//
22
// 3. Neither the name of the Corporation nor the names of the
23
// contributors may be used to endorse or promote products derived from
24
// this software without specific prior written permission.
25
//
26
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
27
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
30
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37
//
38
// Questions? Contact Michael A. Heroux (maherou@sandia.gov)
39
//
40
// ***********************************************************************
41
//@HEADER
42
*/
43
44
/*******************************************************************************
45
* MATRIX FREE matrix vector multiplication
46
******************************************************************************/
47
48
#include <stdio.h>
49
#include <stdlib.h>
50
#include <math.h>
51
#include "az_aztec.h"
52
#include "
az_ifpack.h
"
53
54
void
AZ_ifpack_precon
(
double
x[],
int
options[],
55
int
proc_config[],
double
params[], AZ_MATRIX *Amat,
56
AZ_PRECOND *Prec)
57
58
59
/******************************************************************************/
60
/*
61
* A bogus preconditioning subroutine which simply smooths x[]
62
* in the interior of each local grid by taking averages with
63
* neighboring grid points.
64
*
65
* Parameters:
66
* =========
67
* x On input, a vector. On output, x[] is
68
* smoothed by taking averages with neighbors.
69
*
70
* prec On input, prec->Pmat->aux_ptr points to
71
* that data_structure 'pass_data' which contains
72
* the local grid size (nx,ny) on this processor.
73
*
74
* Amat, input_options, Not used.
75
* proc_config, Amat,
76
* input_params
77
*
78
*/
79
80
81
{
82
int
i, len;
83
void
*
precon
;
84
AZ_IFPACK
*Prec_pass_data;
85
int
nr
,
nc
;
86
double
*
input_vector
;
87
/* Data passing structure. This user- */
88
/* defined data structure is used to pass */
89
/* information through Aztec and back into*/
90
/* the user's subroutines. */
91
92
/*-------------------------------------------------------------------------*/
93
/* Extract necessary data from pass_data */
94
95
Prec_pass_data = (
AZ_IFPACK
*) Prec->Pmat->aux_ptr;
96
precon = (
void
*) Prec_pass_data->
precon
;
97
nr = Prec_pass_data->
nr
;
98
nc = Prec_pass_data->
nc
;
99
if
(nc != 1) abort();
100
/* input_vector = (double *) Prec_pass_data->input_vector; */
101
input_vector = (
double
*) malloc (nr *
sizeof
(
double
));
102
len = nr*
nc
;
103
/* dcopy_(&len, x, &ione, input_vector, &ione); */
104
105
for
(i=0; i<len; i++) input_vector[i] = x[i];
106
107
ifp_apply(precon, nr, nc, input_vector, nr, x, nr);
108
free((
void
*) input_vector);
109
}
AZ_IFPACK_STRUCT::precon
void * precon
Definition:
az_ifpack.h:53
AZ_IFPACK_STRUCT::nc
int nc
Definition:
az_ifpack.h:52
az_ifpack.h
AZ_IFPACK_STRUCT::input_vector
double * input_vector
Definition:
az_ifpack.h:54
AZ_IFPACK_STRUCT
Definition:
az_ifpack.h:48
AZ_ifpack_precon
void AZ_ifpack_precon(double x[], int *, int *, double *, AZ_MATRIX *Amat, AZ_PRECOND *prec)
AZ_IFPACK_STRUCT::nr
int nr
Definition:
az_ifpack.h:52
Generated by
1.8.5