RMullikenDomain.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 "Basis/Transformations/RTransformation.hpp"
#include "Domain/DiscreteDomain.hpp"
#include "Mathematical/Representation/SquareMatrix.hpp"
 
 
namespace GQCP {
 
 
template <typename _Scalar>
class RMullikenDomain:
    public DiscreteDomain {
public:
    using DiscreteDomain::DiscreteDomain;
 
    // The expansion scalar type used for a Mulliken domain: real or complex.
    using Scalar = _Scalar;
 
    SquareMatrix<Scalar> partitionMatrix(const RTransformation<Scalar>& C) const { return SquareMatrix<Scalar>::PartitionMatrix(this->domainIndices(), C.numberOfOrbitals()); }
 
 
    RTransformation<Scalar> projectionMatrix(const RTransformation<Scalar>& C) const { return RTransformation<Scalar> {C.inverse().matrix() * this->partitionMatrix(C) * C.matrix()}; }
};
 
 
}  // namespace GQCP