lapack-complex-gesv.cc (flens/examples/lapack-complex-gesv.cc)

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#include <cxxstd/complex.h>

#include <cxxstd/iostream.h>

///

/// With header __flens.cxx__ all of FLENS gets included.

///

/// :links:  __flens.cxx__ -> file:flens/flens.cxx

#include <flens/flens.cxx>

using namespace std;

using namespace flens;

///

/// Elements are now defined to be *complex*

///

typedef complex<double>   T;

int

main()

{

    ///

    /// Like before we define convenient matrix/vector types ...

    ///

    typedef GeMatrix<FullStorage<T> >           Matrix;

    typedef DenseVector<Array<T> >              Vector;

    typedef Matrix::IndexType                   IndexType;

    typedef DenseVector<Array<IndexType> >      IndexVector;

    ///

    /// Then we setup another toy problem

    ///

    const IndexType n = 3;

    Matrix         A(n,n);

    Vector         b(n);

    IndexVector    piv(n);

    A = T(1, 0), T( 1,-1), T(  2,20),

        T(0, 1), T( 1, 2), T(-10, 8),

        T(0,-1), T(-1, 1), T( 40, 6);

    b = T( 1, 0),

        T(-1, 1),

        T(-2,-1);

    cerr << "A = " << A << endl;

    cerr << "b = " << b << endl;

    ///

    /// And solve it with __lapack::sv__

    ///

    /// :links: __lapack::sv__ -> doc:flens/lapack/ge/sv

    lapack::sv(A, piv, b);

    cerr << "A = " << A << endl;

    cerr << "piv = " << piv << endl;

    cerr << "x = " << b << endl;

}