GuessVectorUpdate.hpp

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// This file is part of GQCG-GQCP.
//
// Copyright (C) 2017-2020  the GQCG developers
//
// GQCG-GQCP is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// GQCG-GQCP is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with GQCG-GQCP.  If not, see <http://www.gnu.org/licenses/>.
 
#pragma once
 
 
#include "Mathematical/Algorithm/Step.hpp"
#include "Mathematical/Optimization/Eigenproblem/EigenproblemEnvironment.hpp"
 
 
namespace GQCP {
 
 
class GuessVectorUpdate:
    public Step<EigenproblemEnvironment<double>> {
 
public:
    /*
     *  PUBLIC OVERRIDDEN METHODS
     */
 
    std::string description() const override {
        return "Calculate new guesses for the eigenvectors from the diagonalized subspace matrix.";
    }
 
 
    void execute(EigenproblemEnvironment<double>& environment) override {
 
        // X contains the new guesses for the eigenvectors, V is the subspace and Z are the eigenvectors of the subspace matrix.
        environment.X = environment.V * environment.Z;  // X is a linear combination of the current subspace vectors
        environment.eigenvectors = environment.X;
    }
};
 
 
}  // namespace GQCP