trmatrix-indexvariable.cc (flens/examples/trmatrix-indexvariable.cc)

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#include <cxxstd/complex.h>

#include <cxxstd/iostream.h>

#include <flens/flens.cxx>

using namespace flens;

using namespace std;

int

main()

{

    typedef TrMatrix<FullStorage<double> >             RealTrMatrix;

    typedef SyMatrix<FullStorage<double> >             RealSyMatrix;

    typedef HeMatrix<FullStorage<complex<double> > >   ComplexHeMatrix;

    typedef GeMatrix<FullStorage<complex<double> > >   ComplexGeMatrix;

///

/// We allocate a triangular matrix, define index variables and use them.

/// As the matrix is upper triangular $i$ and $j$ will only iterate over the

/// upper triangular part.

///

    RealTrMatrix   A(3, Upper);

    RealTrMatrix::IndexVariable i, j;

    A(i,j) = 10*i+j;

    cout << "A = " << A << endl;

///

/// For symmetric and hermitian matrices ...

///

    RealSyMatrix      B(3, Upper);

    ComplexHeMatrix   C(3, Lower);

///

/// ... you simply initialize their dominant triangular part

///

    B.triangular()(i,j) = 2+i-j;

    C.triangular()(i,j) = Complex(i+j,j);

    cout << "B = " << B << endl;

    cout << "C = " << C << endl;

///

/// Finally we initialize different triangular parts of a general complex

/// valued matrix

///

    ComplexGeMatrix   D(3,4);

    D.strictLower()(i,j) = Complex(i,0);

    D.diag(0)(i)         = Complex(666,i);

    D.strictUpper()(i,j) = Complex(i,666);

    cout << "D = " << D << endl;

}