1. Forum
  2. Usenet
  3. COMP.LANG.C++

  • boost ublas matrix initialisation

    From Single Stage to Orbit@21:1/5 to All on Fri Jan 10 22:46:35 2025
    I've been playing with ublas and matrices in Boost.

    Here's some code:
    #include <boost/numeric/ublas/vector.hpp>
    #include <boost/numeric/ublas/matrix.hpp>
    #include <boost/numeric/ublas/io.hpp>

    using namespace boost::numeric::ublas;

    int main()
    {
    vector<double> x(2);
    x[0] = 1; x[1] = 2;

    matrix<double> A (2, 2);
    A(0, 0) = 0; A(0, 1) = 1;
    A(1, 0) = 2; A(1, 1) = 3;

    vector<double> y = prod(A, x);

    std::cout << y << std::endl;
    return 0;
    }

    I've googled but there seems to be no sane way to initialise the
    matrix<double> constructor with a initalisation list?

    Something like:

    matrix<double> A(2,2) = { {0, 1}, {2, 3}};

    looks much neater rather than the code in the example above.

    Any suggestions?

    matrix<double, 2, 2> A { { 0, 1}, {2, 3}};

    That looks much tidier.

    Thanks.
    --
    Tactical Nuclear Kittens

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)