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  1. #include <iostream>
  2. #include <boost/numeric/ublas/matrix.hpp>
  3. #include <boost/numeric/ublas/symmetric.hpp>
  4. int main()
  5. {
  6.     using namespace boost::numeric::ublas;
  7.  
  8.     std::cout << "regular matrix:\n";
  9.     matrix<double> m (3, 3);
  10.     for(unsigned i = 0; i < m.size1(); ++i)
  11.         for(unsigned j = 0; j < m.size2(); ++j)
  12.             m(i, j) = 3*i + j;
  13.  
  14.     for (unsigned i = 0; i < m.size1 (); ++i)
  15.     {
  16.         for (unsigned j = 0; j < m.size2 (); ++j)
  17.             std::cout << m(i, j) << ' ';
  18.         std::cout << '\n';
  19.     }
  20.  
  21.     std::cout << "symmetric matrix:\n";
  22.     symmetric_matrix<double, upper> mu (3, 3);
  23.     for(unsigned i = 0; i < mu.size1(); ++i)
  24.         for(unsigned j = 0; j<=i; ++j)
  25.                mu(i,j) = 3*i + j;
  26.  
  27.     for (unsigned i = 0; i < mu.size1 (); ++i)
  28.     {
  29.         for (unsigned j = 0; j < mu.size2 (); ++j)
  30.             std::cout << mu(i, j) << ' ';
  31.         std::cout << '\n';
  32.     }
  33.  
  34.     std::cout << "attempting assignment...";
  35.     mu = m;
  36. }
  37.  
Runtime error #stdin #stdout 0s 2880KB
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Standard input is empty
stdout
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regular matrix:
0 1 2 
3 4 5 
6 7 8 
symmetric matrix:
0 3 6 
3 4 7 
6 7 8 
attempting assignment...
https://ideone.com/BiA3S
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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