Dune Core Modules (2.8.0)

dynmatrixev.hh
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1// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
2// vi: set et ts=4 sw=2 sts=2:
3#ifndef DUNE_DYNMATRIXEIGENVALUES_HH
4#define DUNE_DYNMATRIXEIGENVALUES_HH
5
6#include <algorithm>
7#include <memory>
8
9#include "dynmatrix.hh"
10#include "fmatrixev.hh"
11
20namespace Dune {
21
22 namespace DynamicMatrixHelp {
23
24#if HAVE_LAPACK
25 using Dune::FMatrixHelp::eigenValuesNonsymLapackCall;
26#endif
27
36 template <typename K, class C>
37 static void eigenValuesNonSym(const DynamicMatrix<K>& matrix,
38 DynamicVector<C>& eigenValues,
39 std::vector<DynamicVector<K>>* eigenVectors = nullptr
40 )
41 {
42
43#if HAVE_LAPACK
44 {
45 const long int N = matrix.rows();
46 const char jobvl = 'n';
47 const char jobvr = eigenVectors ? 'v' : 'n';
48
49
50 // matrix to put into dgeev
51 auto matrixVector = std::make_unique<double[]>(N*N);
52
53 // copy matrix
54 int row = 0;
55 for(int i=0; i<N; ++i)
56 {
57 for(int j=0; j<N; ++j, ++row)
58 {
59 matrixVector[ row ] = matrix[ i ][ j ];
60 }
61 }
62
63 // working memory
64 auto eigenR = std::make_unique<double[]>(N);
65 auto eigenI = std::make_unique<double[]>(N);
66
67 const long int lwork = eigenVectors ? 4*N : 3*N;
68 auto work = std::make_unique<double[]>(lwork);
69 auto vr = eigenVectors ? std::make_unique<double[]>(N*N) : std::unique_ptr<double[]>{};
70
71 // return value information
72 long int info = 0;
73
74 // call LAPACK routine (see fmatrixev_ext.cc)
75 eigenValuesNonsymLapackCall(&jobvl, &jobvr, &N, matrixVector.get(), &N,
76 eigenR.get(), eigenI.get(), nullptr, &N, vr.get(), &N, work.get(),
77 &lwork, &info);
78
79 if( info != 0 )
80 {
81 std::cerr << "For matrix " << matrix << " eigenvalue calculation failed! " << std::endl;
82 DUNE_THROW(InvalidStateException,"eigenValues: Eigenvalue calculation failed!");
83 }
84
85 eigenValues.resize(N);
86 for (int i=0; i<N; ++i)
87 eigenValues[i] = std::complex<double>(eigenR[i], eigenI[i]);
88
89 if (eigenVectors) {
90 eigenVectors->resize(N);
91 for (int i = 0; i < N; ++i) {
92 auto& v = (*eigenVectors)[i];
93 v.resize(N);
94 std::copy(vr.get() + N*i, vr.get() + N*(i+1), &v[0]);
95 }
96 }
97 }
98#else // #if HAVE_LAPACK
99 DUNE_THROW(NotImplemented,"LAPACK not found!");
100#endif
101 }
102 }
103
104}
106#endif
constexpr size_type rows() const
number of rows
Definition: densematrix.hh:737
Construct a matrix with a dynamic size.
Definition: dynmatrix.hh:59
Construct a vector with a dynamic size.
Definition: dynvector.hh:57
Default exception if a function was called while the object is not in a valid state for that function...
Definition: exceptions.hh:279
Default exception for dummy implementations.
Definition: exceptions.hh:261
This file implements a dense matrix with dynamic numbers of rows and columns.
static void eigenValuesNonSym(const DynamicMatrix< K > &matrix, DynamicVector< C > &eigenValues, std::vector< DynamicVector< K > > *eigenVectors=nullptr)
calculates the eigenvalues of a symmetric field matrix
Definition: dynmatrixev.hh:37
Eigenvalue computations for the FieldMatrix class.
#define DUNE_THROW(E, m)
Definition: exceptions.hh:216
Dune namespace.
Definition: alignedallocator.hh:11
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