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