tut02-page02-example.cc (flens/examples/tut02-page02-example.cc)

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#include <cxxstd/iostream.h>

#include <flens/flens.cxx>

using namespace flens;

using namespace std;

int

main()

{

    typedef double                               T;

    typedef DenseVector<Array<T> >               DEVector;

    typedef GeMatrix<FullStorage<T, ColMajor> >  GEMatrix;

    const T  alpha = 1.5,

             beta = 2.5;

    DEVector x(3), y(3), z(3);

    x = 1, 2, 3;

    y = 2, 3, 4;

    z = 3, 4, 5;

    GEMatrix A(3,3);

    A = 1, 2, 3,

        5, 6, 7,

        5, 4, 3;

    ///

    /// Compute $y = \beta y + \alpha A^T x$

    ///

    blas::mv(Trans, alpha, A, x, beta, y);

    ///

    /// Compute the update $y = y + z$

    ///

    blas::axpy(T(1), z, y);

    cout << "y = " << y << endl;

    return 0;

}