137 lines
3.5 KiB
C++
137 lines
3.5 KiB
C++
//=====================================================
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// File : action_lu_solve.hh
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// Author : L. Plagne <laurent.plagne@edf.fr)>
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// Copyright (C) EDF R&D, lun sep 30 14:23:19 CEST 2002
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//=====================================================
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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//
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// This program 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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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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//
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#ifndef ACTION_LU_SOLVE
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#define ACTION_LU_SOLVE
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#include "utilities.h"
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#include "STL_interface.hh"
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#include <string>
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#include "init/init_function.hh"
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#include "init/init_vector.hh"
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#include "init/init_matrix.hh"
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using namespace std;
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template<class Interface>
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class Action_lu_solve
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{
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public :
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static inline std::string name( void )
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{
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return "lu_solve_"+Interface::name();
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}
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static double nb_op_base(int size){
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return 2.0*size*size*size/3.0; // questionable but not really important
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}
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static double calculate( int nb_calc, int size ) {
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// STL matrix and vector initialization
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typename Interface::stl_matrix A_stl;
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typename Interface::stl_vector B_stl;
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typename Interface::stl_vector X_stl;
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init_matrix<pseudo_random>(A_stl,size);
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init_vector<pseudo_random>(B_stl,size);
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init_vector<null_function>(X_stl,size);
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// generic matrix and vector initialization
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typename Interface::gene_matrix A;
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typename Interface::gene_vector B;
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typename Interface::gene_vector X;
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typename Interface::gene_matrix LU;
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Interface::matrix_from_stl(A,A_stl);
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Interface::vector_from_stl(B,B_stl);
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Interface::vector_from_stl(X,X_stl);
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Interface::matrix_from_stl(LU,A_stl);
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// local variable :
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typename Interface::Pivot_Vector pivot; // pivot vector
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Interface::new_Pivot_Vector(pivot,size);
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// timer utilities
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Portable_Timer chronos;
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// time measurement
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chronos.start();
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for (int ii=0;ii<nb_calc;ii++){
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// LU factorization
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Interface::copy_matrix(A,LU,size);
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Interface::LU_factor(LU,pivot,size);
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// LU solve
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Interface::LU_solve(LU,pivot,B,X,size);
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}
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// Time stop
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chronos.stop();
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double time=chronos.user_time();
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// check result :
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typename Interface::stl_vector B_new_stl(size);
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Interface::vector_to_stl(X,X_stl);
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STL_interface<typename Interface::real_type>::matrix_vector_product(A_stl,X_stl,B_new_stl,size);
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typename Interface::real_type error=
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STL_interface<typename Interface::real_type>::norm_diff(B_stl,B_new_stl);
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if (error>1.e-5){
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INFOS("WRONG CALCULATION...residual=" << error);
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STL_interface<typename Interface::real_type>::display_vector(B_stl);
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STL_interface<typename Interface::real_type>::display_vector(B_new_stl);
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exit(0);
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}
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// deallocation and return time
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Interface::free_matrix(A,size);
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Interface::free_vector(B);
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Interface::free_vector(X);
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Interface::free_Pivot_Vector(pivot);
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return time;
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}
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};
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#endif
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