tut01-page03-example03.cc (flens/examples/tut01-page03-example03.cc)

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#include <cxxstd/iostream.h>

#include <flens/flens.cxx>

using namespace flens;

using namespace std;

typedef GeMatrix<FullStorage<double> >  DGeMatrix;

typedef DenseVector<Array<double> >     DDenseVector;

void

foo()

{

    double buffer_[4*4] = { 1,  2,  3,  4,

                            5,  6,  7,  8,

                            9, 10, 11, 12,

                           13, 14, 15, 16};

    DGeMatrix::View    A = DGeMatrix::EngineView(4, 4, buffer_, 1, 4);

    DGeMatrix::View    B = DGeMatrix::EngineView(4, 4, buffer_, 4, 1);

    DGeMatrix::View    C = DGeMatrix::EngineView(2, 4, buffer_, 4, 1);

    DDenseVector::View x = DDenseVector::EngineView(4*4, buffer_);

    DDenseVector::View y = DDenseVector::EngineView(2*4, buffer_, 2);

    cout << "Matrix/vector views created from stack buffer:" << endl;

    cout << "  ColMajor Matrix View" << endl;

    cout << "  A = " << A << endl;

    cout << "  RowMajor Matrix View" << endl;

    cout << "  B = " << B << endl;

    cout << "  RowMajor Matrix View referencing 2 rows" << endl;

    cout << "  C = " << C << endl;

    cout << "  Vector View" << endl;

    cout << "  x = " << x << endl;

    cout << "  Vector View referencing every second element" << endl;

    cout << "  y = " << y << endl;

}

int

main()

{

    foo();

}