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// Copyright Gunter Winkler 2004 - 2009.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <iostream>
#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/triangular.hpp>
#include <boost/numeric/ublas/io.hpp>
using std::cout;
using std::endl;
namespace ublas = boost::numeric::ublas;
int main(int argc, char * argv[] ) {
ublas::matrix<double> M (3, 3);
for (std::size_t i=0; i < M.data().size(); ++i) { M.data()[i] = 1+i ; }
std::cout << "full M = " << M << "\n" ;
ublas::triangular_matrix<double, ublas::lower> L;
ublas::triangular_matrix<double, ublas::unit_lower> UL;
ublas::triangular_matrix<double, ublas::strict_lower> SL;
L = ublas::triangular_adaptor<ublas::matrix<double>, ublas::lower> (M);
SL = ublas::triangular_adaptor<ublas::matrix<double>, ublas::strict_lower> (M);
UL = ublas::triangular_adaptor<ublas::matrix<double>, ublas::unit_lower> (M);
std::cout << "lower L = " << L << "\n"
<< "strict lower SL = " << SL << "\n"
<< "unit lower UL = " << UL << "\n" ;
ublas::triangular_matrix<double, ublas::upper> U;
ublas::triangular_matrix<double, ublas::unit_upper> UU;
ublas::triangular_matrix<double, ublas::strict_upper> SU;
U = ublas::triangular_adaptor<ublas::matrix<double>, ublas::upper> (M);
SU = ublas::triangular_adaptor<ublas::matrix<double>, ublas::strict_upper> (M);
UU = ublas::triangular_adaptor<ublas::matrix<double>, ublas::unit_upper> (M);
std::cout << "upper U = " << U << "\n"
<< "strict upper SU = " << SU << "\n"
<< "unit upper UU = " << UU << "\n" ;
std::cout << "M = L + SU ? " << ((norm_inf( M - (L + SU) ) == 0.0)?"ok":"failed") << "\n";
std::cout << "M = U + SL ? " << ((norm_inf( M - (U + SL) ) == 0.0)?"ok":"failed") << "\n";
}
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