1 // Copyright Gunter Winkler 2004 - 2009.
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE_1_0.txt or copy at
4 // http://www.boost.org/LICENSE_1_0.txt)
5
6
7 #include <iostream>
8
9 #include <boost/numeric/ublas/matrix.hpp>
10 #include <boost/numeric/ublas/triangular.hpp>
11
12 #include <boost/numeric/ublas/io.hpp>
13
14 using std::cout;
15 using std::endl;
16
17
18
19 namespace ublas = boost::numeric::ublas;
20
21
main(int argc,char * argv[])22 int main(int argc, char * argv[] ) {
23
24 ublas::matrix<double> M (3, 3);
25 for (std::size_t i=0; i < M.data().size(); ++i) { M.data()[i] = 1+i ; }
26
27 std::cout << "full M = " << M << "\n" ;
28
29 ublas::triangular_matrix<double, ublas::lower> L;
30 ublas::triangular_matrix<double, ublas::unit_lower> UL;
31 ublas::triangular_matrix<double, ublas::strict_lower> SL;
32
33 L = ublas::triangular_adaptor<ublas::matrix<double>, ublas::lower> (M);
34 SL = ublas::triangular_adaptor<ublas::matrix<double>, ublas::strict_lower> (M);
35 UL = ublas::triangular_adaptor<ublas::matrix<double>, ublas::unit_lower> (M);
36
37 std::cout << "lower L = " << L << "\n"
38 << "strict lower SL = " << SL << "\n"
39 << "unit lower UL = " << UL << "\n" ;
40
41 ublas::triangular_matrix<double, ublas::upper> U;
42 ublas::triangular_matrix<double, ublas::unit_upper> UU;
43 ublas::triangular_matrix<double, ublas::strict_upper> SU;
44
45 U = ublas::triangular_adaptor<ublas::matrix<double>, ublas::upper> (M);
46 SU = ublas::triangular_adaptor<ublas::matrix<double>, ublas::strict_upper> (M);
47 UU = ublas::triangular_adaptor<ublas::matrix<double>, ublas::unit_upper> (M);
48
49 std::cout << "upper U = " << U << "\n"
50 << "strict upper SU = " << SU << "\n"
51 << "unit upper UU = " << UU << "\n" ;
52
53 std::cout << "M = L + SU ? " << ((norm_inf( M - (L + SU) ) == 0.0)?"ok":"failed") << "\n";
54 std::cout << "M = U + SL ? " << ((norm_inf( M - (U + SL) ) == 0.0)?"ok":"failed") << "\n";
55
56 }
57
58
59