1 // SPDX-License-Identifier: Apache-2.0
2 //
3 // Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
4 // Copyright 2008-2016 National ICT Australia (NICTA)
5 //
6 // Licensed under the Apache License, Version 2.0 (the "License");
7 // you may not use this file except in compliance with the License.
8 // You may obtain a copy of the License at
9 // http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 // ------------------------------------------------------------------------
17 
18 
19 namespace newarp
20 {
21 
22 
23 //! This class implements the eigen solver for real symmetric matrices in the shift-and-invert mode.
24 template<typename eT, int SelectionRule, typename OpType>
25 class SymEigsShiftSolver : public SymEigsSolver<eT, SelectionRule, OpType>
26   {
27   private:
28 
29   const eT sigma;
30 
31   // Sort the first nev Ritz pairs in ascending algebraic order
32   // This is used to return the final results
33   void sort_ritzpair();
34 
35 
36   public:
37 
38   //! Constructor to create a solver object.
39   inline SymEigsShiftSolver(const OpType& op_, uword nev_, uword ncv_, const eT sigma_);
40   };
41 
42 
43 }  // namespace newarp
44