1// Ceres Solver - A fast non-linear least squares minimizer
2// Copyright 2013 Google Inc. All rights reserved.
3// http://code.google.com/p/ceres-solver/
4//
5// Redistribution and use in source and binary forms, with or without
6// modification, are permitted provided that the following conditions are met:
7//
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9//   this list of conditions and the following disclaimer.
10// * Redistributions in binary form must reproduce the above copyright notice,
11//   this list of conditions and the following disclaimer in the documentation
12//   and/or other materials provided with the distribution.
13// * Neither the name of Google Inc. nor the names of its contributors may be
14//   used to endorse or promote products derived from this software without
15//   specific prior written permission.
16//
17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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20// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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28//
29// Author: sameeragarwal@google.com (Sameer Agarwal)
30
31#include "ceres/preconditioner.h"
32#include "glog/logging.h"
33
34namespace ceres {
35namespace internal {
36
37Preconditioner::~Preconditioner() {
38}
39
40PreconditionerType Preconditioner::PreconditionerForZeroEBlocks(
41    PreconditionerType preconditioner_type) {
42  if (preconditioner_type == SCHUR_JACOBI ||
43      preconditioner_type == CLUSTER_JACOBI ||
44      preconditioner_type == CLUSTER_TRIDIAGONAL) {
45    return JACOBI;
46  }
47  return preconditioner_type;
48}
49
50SparseMatrixPreconditionerWrapper::SparseMatrixPreconditionerWrapper(
51    const SparseMatrix* matrix)
52    : matrix_(CHECK_NOTNULL(matrix)) {
53}
54
55SparseMatrixPreconditionerWrapper::~SparseMatrixPreconditionerWrapper() {
56}
57
58bool SparseMatrixPreconditionerWrapper::UpdateImpl(const SparseMatrix& A,
59                                                   const double* D) {
60  return true;
61}
62
63void SparseMatrixPreconditionerWrapper::RightMultiply(const double* x,
64                                                      double* y) const {
65  matrix_->RightMultiply(x, y);
66}
67
68int  SparseMatrixPreconditionerWrapper::num_rows() const {
69  return matrix_->num_rows();
70}
71
72}  // namespace internal
73}  // namespace ceres
74