58 template<
typename Treal,
typename Tmatrix,
typename Tvector>
61 Lanczos(Tmatrix
const & AA, Tvector
const & startVec,
62 int maxIt = 100,
int cap = 100)
66 Treal
const ONE = 1.0;
71 v[0] *= (ONE /
v[0].eucl());
80 Treal
const ONE = 1.0;
82 v[0] *= (ONE / startVec.eucl());
117 void getEigVector(Tvector& eigVec, Treal
const *
const eVecTri)
const;
118 virtual void update() = 0;
125 template<
typename Treal,
typename Tmatrix,
typename Tvector>
129 Treal
const ONE = 1.0;
130 A.matVecProd(
r,
v[
j]);
135 v[j-1].writeToFile();
139 v[j+1] *= ONE /
beta;
148 template<
typename Treal,
typename Tmatrix,
typename Tvector>
159 eigVec *= eVecTri[0];
160 for (
int ind = 1; ind <=
j - 2; ++ind) {
161 v[ind].readFromFile();
162 eigVec += eVecTri[ind] *
v[ind];
163 v[ind].writeToFile();
165 eigVec += eVecTri[
j-1] *
v[
j-1];
168 template<
typename Treal,
typename Tmatrix,
typename Tvector>
174 Tvector* new_v =
new Tvector[
capacity];
178 for (
int ind = 0; ind <=
j - 2; ind++){
179 v[ind].readFromFile();
181 new_v[ind].writeToFile();
183 for (
int ind =
j - 1; ind <=
j; ind++){
Tvector * v
Definition: Lanczos.h:105
virtual void run()
Definition: Lanczos.h:87
int j
Definition: Lanczos.h:113
void step()
Definition: Lanczos.h:126
Treal beta
Definition: Lanczos.h:122
virtual bool converged() const =0
void copyTridiag(MatrixTridiagSymmetric< Treal > &Tricopy)
Definition: Lanczos.h:97
Tridiagonal symmetric matrix class template.
Definition: MatrixTridiagSymmetric.h:47
Treal alpha
Definition: Lanczos.h:121
Class for tridiagonal symmetric matrices.
virtual ~Lanczos()
Definition: Lanczos.h:100
Definition: allocate.cc:39
MatrixTridiagSymmetric< Treal > Tri
Residual vector.
Definition: Lanczos.h:111
Utilities used by other parts of the hierarchical matrix library.
void getEigVector(Tvector &eigVec, Treal const *const eVecTri) const
Definition: Lanczos.h:150
int capacity
Definition: Lanczos.h:112
int maxIter
Current step.
Definition: Lanczos.h:114
Tmatrix const & A
Definition: Lanczos.h:104
void increaseCapacity(int const newCapacity)
Definition: Lanczos.h:170
Lanczos(Tmatrix const &AA, Tvector const &startVec, int maxIt=100, int cap=100)
Definition: Lanczos.h:61
void restart(Tvector const &startVec)
Definition: Lanczos.h:74
Tvector r
Vectors spanning Krylov subspace.
Definition: Lanczos.h:110
Class template for building Krylov subspaces with Lanczos.
Definition: Lanczos.h:59
Xtrans< TX > transpose(TX const &A)
Transposition.
Definition: matrix_proxy.h:131
Treal template_blas_sqrt(Treal x)