Spectra::GenEigsRealShiftSolver< OpType > Class Template Reference

#include <Spectra/GenEigsRealShiftSolver.h>

Inheritance diagram for Spectra::GenEigsRealShiftSolver< OpType >:

Public Member Functions
	GenEigsRealShiftSolver (OpType &op, Index nev, Index ncv, const Scalar &sigma)
Public Member Functions inherited from Spectra::GenEigsBase< DenseGenRealShiftSolve< double >, IdentityBOp >
void	init (const Scalar *init_resid)
void	init ()
Index	compute (SortRule selection=SortRule::LargestMagn, Index maxit=1000, Scalar tol=1e-10, SortRule sorting=SortRule::LargestMagn)
CompInfo	info () const
Index	num_iterations () const
Index	num_operations () const
ComplexVector	eigenvalues () const
ComplexMatrix	eigenvectors (Index nvec) const
ComplexMatrix	eigenvectors () const

Detailed Description

template<typename OpType = DenseGenRealShiftSolve<double>>
class Spectra::GenEigsRealShiftSolver< OpType >

This class implements the eigen solver for general real matrices with a real shift value in the shift-and-invert mode. The background knowledge of the shift-and-invert mode can be found in the documentation of the SymEigsShiftSolver class.

Template Parameters

OpType

The name of the matrix operation class. Users could either use the wrapper classes such as DenseGenRealShiftSolve and SparseGenRealShiftSolve, or define their own that implements the type definition Scalar and all the public member functions as in DenseGenRealShiftSolve.

Definition at line 33 of file GenEigsRealShiftSolver.h.

Constructor & Destructor Documentation

GenEigsRealShiftSolver()

template<typename OpType = DenseGenRealShiftSolve<double>>

Spectra::GenEigsRealShiftSolver< OpType >::GenEigsRealShiftSolver ( OpType &  op, Index  nev, Index  ncv, const Scalar &  sigma  )

inline

Constructor to create a eigen solver object using the shift-and-invert mode.

Parameters

op	The matrix operation object that implements the shift-solve operation of \(A\): calculating \((A-\sigma I)^{-1}v\) for any vector \(v\). Users could either create the object from the wrapper class such as DenseGenRealShiftSolve, or define their own that implements all the public members as in DenseGenRealShiftSolve.
nev	Number of eigenvalues requested. This should satisfy \(1\le nev \le n-2\), where \(n\) is the size of matrix.
ncv	Parameter that controls the convergence speed of the algorithm. Typically a larger ncv means faster convergence, but it may also result in greater memory use and more matrix operations in each iteration. This parameter must satisfy \(nev+2 \le ncv \le n\), and is advised to take \(ncv \ge 2\cdot nev + 1\).
sigma	The real-valued shift.

Definition at line 75 of file GenEigsRealShiftSolver.h.

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The documentation for this class was generated from the following file:

• Spectra/GenEigsRealShiftSolver.h