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main.cpp
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Thu, Jul 10, 01:30

main.cpp
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/**
* @file main.cpp
* @author Sergio Hernandez
* This file is part of the Conjugate Gradient Project
*
* Ths is the entry point of the project.
*
*/
#include <iostream>
#include<vector>
#include "CG_Serial.hpp"
#include "ConfigFileParser.hpp"
/**
* Constant to inform the user the correct usage of the program in case of a misuse.
*/
#define USAGE "Please enter correctly one argument (a config file). Example: ./CG_Parallel configFile.txt"
/**
* Constant which defines the correct number of arguments the program can receive.
*/
#define N_ARGS 2
int main(int argc, char* argv[]) {
//TODO Temporal - using Tridiagonal matrix
if(argc!=N_ARGS){
std::cout<<USAGE<< std::endl;
return 1;
}
try {
int N, max_iter, number_outputs;
double tol;
std::string type_input, type_output, outputFile;
std::vector<double> A;//Filled with 0.0
std::vector<double> b;//Filled with 1.0
std::string fName = argv[1];
ConfigFileParser parser = ConfigFileParser();
parser.parseFile(fName);
parser.verify();
std::cout << "Finished parsing the file " << std::endl;
//This could be an executer
std::map<std::string, std::string> data = parser.getData();
//Size of the matrix
std::string tempKey = "N";
N = stoi(data[tempKey]);
std::cout << " N = " << N << std::endl;
//Tolerance
tempKey = "tol";
tol = stof(data[tempKey]);
std::cout << " tol = " << tol << std::endl;
//max iterations
tempKey = "max_iter";
max_iter = stoi(data[tempKey]);
std::cout << " max_iter = " << max_iter << std::endl;
//type input
tempKey = "type_input";
type_input = data[tempKey];
//number_outputs
tempKey = "number_outputs";
number_outputs = stoi(data[tempKey]);
tempKey = "type_output";
type_output = data[tempKey];
tempKey = "outputFile";
outputFile = data[tempKey];
if (type_input=="tridiagonal") {
std::cout<<"Matrix A is: "<<type_input<< std::endl;
//TODO Temporal - using Tridiagonal matrix
A.resize(N*N);//Fills it with 0s.
b.resize(N,1.0);//Fills it with 0s.
std::fill(b.begin(), b.end(), 1);//Fills it with 1s.
for (int i=0; i<N; i++){
for (int j=0; j<N; j++){
if (j == i+1){
if (i < N-1 ) {
A[i + N * j] = 1.0; //Upper
}
}
if (j == i-1){
if (i > 0 ){
A[i+N*j] = 1.0; //Downer
}
}
if (j == i){
A[i+N*j] = -2.0; //Main diagonal
}
}
}
}
std::vector<double> x_0 (N,0.0);
CG_Serial solver = CG_Serial(A,b,tol,max_iter);
std::tuple<std::vector<double>,int> result = solver.computeCG(x_0);
std::vector<double> x = std::get<0>(result);
int k = std::get<1>(result);
std::cout << "Solution was found after : "<<k<<" iterations.\n";
std::cout<<"Solution x: \n";
for(int i=0;i<x.size();i++){
std::cout<< x[i]<<"\n";
}
}
catch(const std::runtime_error &e){
std::cout << e.what() <<std::endl;
return 1;
}
return 0;
}

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