tut05-mylapack-version2.h (flens/examples/tut05-mylapack-version2.h)

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///

/// Define `USE_CXXLAPACK` before you include the FLENS headers

///

#ifndef USE_CXXLAPACK

#define USE_CXXLAPACK

#endif

#include <flens/flens.cxx>

using namespace flens;

namespace mylapack {

template <typename MA, typename VPIV>

typename GeMatrix<MA>::IndexType

trf(GeMatrix<MA> &A, DenseVector<VPIV> &piv)

{

    typedef typename GeMatrix<MA>::IndexType IndexType;

    return cxxlapack::getrf<IndexType>(A.numRows(),

                                       A.numCols(),

                                       A.data(),

                                       A.leadingDimension(),

                                       piv.data());

}

///

/// Note the `&&` in front of b.  This means that `b` can now be non-const

/// rvalue objects.  Such objects arise when we create views using the

/// underscore operator, e.g. by `b(_(1,n))`.

///

template <typename MA, typename VPIV, typename VB>

void

trs(Transpose trans, const GeMatrix<MA> &A, const DenseVector<VPIV> &piv,

    DenseVector<VB> &&b)

///

{

    typedef typename GeMatrix<MA>::IndexType IndexType;

    cxxlapack::getrs<IndexType>(lapack::getF77Char(trans),

                                A.numRows(),

                                1,

                                A.data(),

                                A.leadingDimension(),

                                piv.data(),

                                b.data(),

                                b.length());

}

} // namespace mylapack