Ticket #10045: symmetric_matrix_serialize.cpp

// Example for supporting serialization in boost::numeric::ublas::symmetrix_matrix.
// =====================================================================
// In response to https://svn.boost.org/trac/boost/ticket/10045


// Author
// ==============
// Shivam Mittal
// Email - 2015csb1032@iitrpr.ac.in
// Github profile - github.com/shivam5
// Date - 2nd April 2017


// Compiling 
// ==========
 // g++ -I <path to modular_boost> symmetric_matrix_serialize.cpp -L<path to installed libraries (stage/lib)> -static -lboost_serialization

 // Example (my computer):
 // g++ -I /home/shivam/Desktop/boost/modular_boost/ symmetric_matrix_serialize.cpp -L/home/shivam/Desktop/boost/modular_boost/stage/lib -static -lboost_serialization

// Running
// ==========
// ./a.out

#include <boost/numeric/ublas/io.hpp>
#include <boost/numeric/ublas/symmetric.hpp>
#include <iostream>
#include <fstream>
#include <string>
#include <boost/archive/text_iarchive.hpp>
#include <boost/archive/text_oarchive.hpp>

using namespace boost::numeric::ublas;

template <typename T, typename U>
void save_smatrix(const symmetric_matrix<T,U> &s, const char * filename){
    std::ofstream ofs(filename);
    boost::archive::text_oarchive oa(ofs);
    oa << s;
}

template <typename T, typename U>
void load_smatrix(symmetric_matrix<T,U> &s, const char * filename){
    std::ifstream ifs(filename);
    boost::archive::text_iarchive ia(ifs);
    ia >> s;
}

int main () {

    std::string filename = "filename";

    symmetric_matrix<double, lower> ml (3, 3);
    for (unsigned i = 0; i < ml.size1 (); ++ i)
        for (unsigned j = 0; j <= i; ++ j)
            ml (i, j) = 3 * i + j;
    symmetric_matrix<double, upper> mu (3, 3);
    for (unsigned i = 0; i < mu.size1 (); ++ i)
        for (unsigned j = i; j < mu.size2 (); ++ j)
            mu (i, j) = 3 * i + j;


    std::cout << ml << std::endl;
    save_smatrix <double, lower> (ml, filename.c_str());
    symmetric_matrix<double, lower> ml2 (3, 3);
    load_smatrix <double, lower>(ml2, filename.c_str());
    std::cout << ml2 << std::endl;

    std::cout << mu << std::endl;
    save_smatrix <double, upper> (mu, filename.c_str());
    symmetric_matrix<double, upper> mu2 (3, 3);
    load_smatrix <double, upper>(mu2, filename.c_str());
    std::cout << mu2 << std::endl;

    return 0;
}