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107 | // *****************************************************************************
/*!
\file src/LinearSolver/CSR.hpp
\copyright 2012-2015 J. Bakosi,
2016-2018 Los Alamos National Security, LLC.,
2019-2021 Triad National Security, LLC.,
2022-2024 J. Bakosi
All rights reserved. See the LICENSE file for details.
\brief Compressed sparse row (CSR) storage for a sparse matrix
*/
// *****************************************************************************
#pragma once
#include <vector>
#include <unordered_map>
#include "NoWarning/pup_stl.hpp"
#include "Types.hpp"
namespace tk {
//! Compressed sparse row (CSR) storage for a sparse matrix
class CSR {
public:
//! \brief Constructor: Create a CSR symmetric matrix with ncomp scalar
//! components, storing only the upper triangular part
explicit CSR( std::size_t nc,
const std::pair< std::vector< std::size_t >,
std::vector< std::size_t > >& psup );
//! Empty constructor for Charm++
explicit CSR() = default;<--- Member variable 'CSR::ncomp' is not initialized in the constructor.
//! Return const reference to sparse matrix entry at a position
const real&
operator()( std::size_t row, std::size_t col, std::size_t pos=0 ) const;
//! Return non-const reference to sparse matrix entry at a position
//! \see "Avoid Duplication in const and Non-const Member Function," and
//! "Use const whenever possible," Scott Meyers, Effective C++, 3d ed.
real&
operator()( std::size_t row, std::size_t col, std::size_t pos=0 ) {
return const_cast< real& >(
static_cast< const CSR& >( *this ).operator()( row, col, pos ) );
}
//! Set Dirichlet boundary condition at a node
void dirichlet(
std::size_t i,
tk::real val,
std::vector< tk::real >& b,
const std::vector< std::size_t >& gid = {},
const std::unordered_map< int,
std::unordered_set< std::size_t > >& nodecommap = {},
std::size_t pos=0 );
//! Multiply CSR matrix with vector from the right: r = A * x
void mult( const std::vector< real >& x, std::vector< real >& r ) const;
//! Zero matrix values
void zero();
//! Access real size of matrix
std::size_t rsize() const { return rnz.size()*ncomp; }
//! Access the number of scalar components per non-zero matrix entry
std::size_t Ncomp() const { return ncomp; }
//! Write out CSR as stored
std::ostream& write_stored( std::ostream &os ) const;
//! Write out CSR nonzero structure
std::ostream& write_structure( std::ostream &os ) const;
//! Write out CSR contribute structure
std::ostream& write_contribute( std::ostream &os ) const;
//! Write out CSR as a real matrix
std::ostream& write_matrix( std::ostream &os ) const;
//! Write out CSR in Matlab/Octave format
std::ostream& write_matlab( std::ostream &os ) const;
/** @name Pack/unpack (Charm++ serialization) routines */
///@{
//! \brief Pack/Unpack serialize member function
//! \param[in,out] p Charm++'s PUP::er serializer object reference
void pup( PUP::er &p ) {<--- Parameter 'p' can be declared as reference to const
p | ncomp;
p | rnz;
p | ia;
p | ja;
p | a;
}
//! \brief Pack/Unpack serialize operator|
//! \param[in,out] p Charm++'s PUP::er serializer object reference
//! \param[in,out] c CSR object reference
friend void operator|( PUP::er& p, CSR& c ) { c.pup(p); }
///@}
private:
std::size_t ncomp; //!< Number of scalars per non-zero
std::vector< std::size_t > rnz; //!< Number of nonzeros in each row
std::vector< std::size_t > ia; //!< Row pointers
std::vector< std::size_t > ja; //!< Column indices
std::vector< real > a; //!< Nonzero matrix values
};
} // tk::
|