147 lines
4.4 KiB
C++
147 lines
4.4 KiB
C++
//This file is part of Bertini 2.
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//
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//mhom.hpp is free software: you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation, either version 3 of the License, or
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//(at your option) any later version.
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//
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//mhom.hpp is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//
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//You should have received a copy of the GNU General Public License
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//along with mhom.hpp. If not, see <http://www.gnu.org/licenses/>.
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//
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// Copyright(C) 2015 - 2021 by Bertini2 Development Team
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//
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// See <http://www.gnu.org/licenses/> for a copy of the license,
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// as well as COPYING. Bertini2 is provided with permitted
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// additional terms in the b2/licenses/ directory.
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// individual authors of this file include:
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// Tim Hodges, Colorado State University
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// silviana amethyst, university of wisconsin eau claire
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/**
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\file mhom.hpp
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\brief Defines the MHomogeneous start system type.
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*/
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#pragma once
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#include "bertini2/system/start_base.hpp"
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#include "bertini2/system/start/utility.hpp"
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namespace bertini
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{
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namespace start_system
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{
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/**
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\brief The $m$-homogeneous start system for Numerical Algebraic Geometry
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*/
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class MHomogeneous : public StartSystem
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{
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public:
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MHomogeneous() = default;
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virtual ~MHomogeneous() = default;
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/**
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Constructor for making a multi-homogeneous start system from a polynomial system
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\throws std::runtime_error, if the input target system is not square, is not polynomial, has a path variable already.
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Constructor can take in a non-homogeneous system or homogeneous system.
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*/
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MHomogeneous(System const& s);
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/**
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\brief Creates a degree matrix for constructing the multi-homogeneous start system.
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*/
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void CreateDegreeMatrix(System const& s);
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/**
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\brief Creates all valid partitions for multi-homogeneous start system to create start points.
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*/
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void GenerateValidPartitions(System const& s);
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/**
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\brief Helper function that is used to find valid partitions in the degree matrix.
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*/
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int ChooseColumnInRow(System const& s,Vec<int>& variable_group_counter, int row, int column);
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/**
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Get the number of start points for this m-homogeneous start system. This is the Bezout bound for the target system. Provided here for your convenience.
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*/
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unsigned long long NumStartPoints() const override;
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unsigned long long NumStartPointsForPartition(Vec<int> partition) const;
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MHomogeneous& operator*=(Nd const& n);
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MHomogeneous& operator+=(System const& sys) = delete;
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/**
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\brief Degree matrix holding degrees for all functions in terms of all variable groups
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*/
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Mat<int> degree_matrix_; // stores degrees of all functions in all homogeneous variable groups.
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/**
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\brief Partitions used for creating start points in the multi-homogeneous start system.
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*/
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std::deque< Vec<int> > valid_partitions_;
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private:
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/**
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Get the ith start point, in double precision.
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Called by the base StartSystem's StartPoint(index) method.
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*/
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Vec<dbl> GenerateStartPoint(dbl,unsigned long long index) const override;
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/**
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Get the ith start point, in current default precision.
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Called by the base StartSystem's StartPoint(index) method.
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*/
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Vec<mpfr_complex> GenerateStartPoint(mpfr_complex,unsigned long long index) const override;
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/**
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A local version of GenerateStartPoint that can be templated
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*/
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template<typename T>
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void GenerateStartPointT(Vec<T>& start_point, unsigned long long index) const;
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std::vector<unsigned long long> degrees_; ///< stores the degrees of the functions.
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std::vector< VariableGroup > var_groups_;
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Mat<std::shared_ptr<node::LinearProduct>> linprod_matrix_; ///< All the linear products for each entry in the degree matrix.
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std::vector< std::vector<size_t> > variable_cols_; ///< The columns associated with each variable. The first index is the variable group, the second index is the particular variable in the group.
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mutable Vec<mpfr_complex> temp_v_mp_;
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friend class boost::serialization::access;
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template <typename Archive>
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void serialize(Archive& ar, const unsigned version)
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{
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ar & boost::serialization::base_object<StartSystem>(*this);
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ar & degrees_;
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}
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};
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}//end start_system namespace
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}//end bertini namespace
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