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

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#if defined(__SSE3__)

//#   undef __SSE3__

#endif

#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;

typedef double   T;

int

main()

{

    ///

    ///  Define some convenient typedefs for the matrix/vector types

    ///  of our system of linear equations.

    ///

    typedef GeMatrix<FullStorage<T> >           Matrix;

    typedef DenseVector<Array<T> >              Vector;

    ///

    ///  We also need an extra vector type for the pivots.  The type of the

    ///  pivots is taken for the system matrix.

    ///

    typedef Matrix::IndexType                   IndexType;

    typedef DenseVector<Array<IndexType> >      IndexVector;

    ///

    ///  Set up the  problem ...

    ///

    const IndexType n = 4000;

    Matrix         A(n,n);

    Vector         b(n);

    IndexVector    piv(n);

    fillRandom(A);

    fillRandom(b);

    ///

    /// And solve it with __lapack::sv__

    ///

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

    lapack::sv(A, piv, b);

    Underscore<IndexType> _;

    lapack::sv(A(_(1,2,n),_(1,2,n)), piv(_(1,2,n)), b(_(1,2,n)));

}