sparse_matrix_aij.hh
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sparse_matrix_aij.hh
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	/**
	* Copyright (©) 2010-2023 EPFL (Ecole Polytechnique Fédérale de Lausanne)
	* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
	*
	* This file is part of Akantu
	*
	* Akantu 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.
	*
	* Akantu 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 Akantu. If not, see <http://www.gnu.org/licenses/>.
	*/

	/* -------------------------------------------------------------------------- */
	#include "aka_array.hh"
	#include "aka_common.hh"
	#include "sparse_matrix.hh"
	/* -------------------------------------------------------------------------- */
	#include <unordered_map>
	/* -------------------------------------------------------------------------- */

	#ifndef AKANTU_SPARSE_MATRIX_AIJ_HH_
	#define AKANTU_SPARSE_MATRIX_AIJ_HH_

	namespace akantu {
	class DOFManagerDefault;
	class TermsToAssemble;
	} // namespace akantu

	namespace akantu {

	class SparseMatrixAIJ : public SparseMatrix {
	/* ------------------------------------------------------------------------ */
	/* Constructors/Destructors */
	/* ------------------------------------------------------------------------ */
	public:
	SparseMatrixAIJ(DOFManagerDefault & dof_manager,
	const MatrixType & matrix_type,
	const ID & id = "sparse_matrix_aij");

	SparseMatrixAIJ(const SparseMatrixAIJ & matrix,
	const ID & id = "sparse_matrix_aij");

	~SparseMatrixAIJ() override;

	/* ------------------------------------------------------------------------ */
	/* Methods */
	/* ------------------------------------------------------------------------ */
	public:
	/// remove the existing profile
	inline void clearProfile() override;

	/// add a non-zero element
	inline Idx add(Idx i, Idx j) override;

	/// set the matrix to 0
	void set(Real val) override;

	/// assemble a local matrix in the sparse one
	inline void add(Idx i, Idx j, Real value) override;

	/// add a block of values
	inline void addValues(const Vector<Int> & is, const Vector<Int> & js,
	const Matrix<Real> & values, MatrixType values_type);

	/// set the size of the matrix
	void resize(Int size) { this->size_ = size; }

	/// modify the matrix to "remove" the blocked dof
	void applyBoundary(Real block_val = 1.) override;

	/// save the profil in a file using the MatrixMarket file format
	void saveProfile(const std::string & filename) const override;

	/// save the matrix in a file using the MatrixMarket file format
	void saveMatrix(const std::string & filename) const override;

	/// copy assuming the profile are the same
	virtual void copyContent(const SparseMatrix & matrix);

	/// multiply the matrix by a scalar
	void mul(Real alpha) override;

	/// Equivalent of *gemv in blas
	void matVecMul(const SolverVector & x, SolverVector & y, Real alpha = 1.,
	Real beta = 0.) const override;

	void matVecMul(const Array<Real> & x, Array<Real> & y, Real alpha = 1.,
	Real beta = 0.) const;

	/// copy the profile of another matrix
	void copyProfile(const SparseMatrix & other) override;

	/// Check if all entries are finite
	virtual bool isFinite() const override;

	/* ------------------------------------------------------------------------ */
	/// accessor to A_{ij} - if (i, j) not present it returns 0
	inline Real operator()(Idx i, Idx j) const override;

	/// accessor to A_{ij} - if (i, j) not present it fails, (i, j) should be
	/// first added to the profile
	inline Real & operator()(Idx i, Idx j) override;

	/// accessor to get the minimum value of A_{ij}
	inline Real min() override;

	protected:
	void addMeTo(SparseMatrix & B, Real alpha) const override;

	inline void addSymmetricValuesToSymmetric(const Vector<Idx> & is,
	const Vector<Idx> & js,
	const Matrix<Real> & values);
	inline void addUnsymmetricValuesToSymmetric(const Vector<Idx> & is,
	const Vector<Idx> & js,
	const Matrix<Real> & values);
	inline void addValuesToUnsymmetric(const Vector<Idx> & is,
	const Vector<Idx> & js,
	const Matrix<Real> & values);

	private:
	/// This is just to inline the addToMatrix function
	template <class MatrixType>
	void addMeToTemplated(MatrixType & B, Real alpha) const;

	/* ------------------------------------------------------------------------ */
	/* Accessors */
	/* ------------------------------------------------------------------------ */
	public:
	AKANTU_GET_MACRO_AUTO(IRN, irn);
	AKANTU_GET_MACRO_AUTO(JCN, jcn);
	AKANTU_GET_MACRO_AUTO(A, a);

	/// The release changes at each call of a function that changes the profile,
	/// it in increasing but could overflow so it should be checked as
	/// (my_release != release) and not as (my_release < release)
	AKANTU_GET_MACRO_AUTO(ProfileRelease, profile_release);
	AKANTU_GET_MACRO_AUTO(ValueRelease, value_release);
	Int getRelease() const override { return value_release; }

	protected:
	using KeyCOO = std::pair<Idx, Idx>;
	using coordinate_list_map = std::unordered_map<KeyCOO, Idx>;

	/// get the pair corresponding to (i, j)
	inline KeyCOO key(Idx i, Idx j) const {
	if (this->matrix_type == _symmetric && (i > j)) {
	return std::make_pair(j, i);
	}
	return std::make_pair(i, j);
	}

	/* ------------------------------------------------------------------------ */
	/* Class Members */
	/* ------------------------------------------------------------------------ */
	private:
	DOFManagerDefault & dof_manager;

	/// row indexes
	Array<Int> irn;

	/// column indexes
	Array<Int> jcn;

	/// values : A[k] = Matrix[irn[k]][jcn[k]]
	Array<Real> a;

	/// Profile release
	Int profile_release{1};

	/// Value release
	Int value_release{1};

	/// map for (i, j) -> k correspondence
	coordinate_list_map irn_jcn_k;

	// need access to irn and jcn and a has not const
	friend class SparseSolverMumps;
	};

	} // namespace akantu

	/* -------------------------------------------------------------------------- */
	/* inline functions */
	/* -------------------------------------------------------------------------- */
	#include "sparse_matrix_aij_inline_impl.hh"

	#endif /* AKANTU_SPARSE_MATRIX_AIJ_HH_ */

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