/usr/include/trilinos/RTOpPack_LapackWrappers.hpp is in libtrilinos-dev 10.4.0.dfsg-1ubuntu2.
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// ***********************************************************************
//
// RTOp: Interfaces and Support Software for Vector Reduction Transformation
// Operations
// Copyright (2006) Sandia Corporation
//
// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
// license for use of this work by or on behalf of the U.S. Government.
//
// This library is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; either version 2.1 of the
// License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA
// Questions? Contact Roscoe A. Bartlett (rabartl@sandia.gov)
//
// ***********************************************************************
// @HEADER
#ifndef RTOPPACK_LAPACK_WRAPPERS_HPP
#define RTOPPACK_LAPACK_WRAPPERS_HPP
#include "RTOpPack_Types.hpp"
#include "Teuchos_LAPACK.hpp"
#include "Teuchos_as.hpp"
namespace RTOpPack {
/** \brief . */
enum ETransp {
NOTRANS, TRANS, CONJTRANS
};
const int NUM_ETRANS_ARGS = 3;
/** \brief. */
extern const Teuchos::Tuple<char,NUM_ETRANS_ARGS> transpMap;
/** \brief Peform an in-place factorization of a square or rectangular matrix.
*
* \param A [in/out] On input, contains the entries of the square matrix. On
* output, contains the L and U factors.
*
* \param ipiv [in] On output, contains the pivots used in the factorization.
* Note: This will be a 1-based valued array since this is a Fortran routine!
*
* \param rank [out] On output, gives the rank of the factorization.
*/
template<class Scalar>
void getrf(
const SubMultiVectorView<Scalar> &A,
const ArrayView<int> &ipiv,
const Ptr<int> &rank
);
/** \brief . */
template<class Scalar>
void getrs(
const ConstSubMultiVectorView<Scalar> &A,
const ArrayView<const int> &ipiv,
const ETransp transp,
const Ptr<const SubMultiVectorView<Scalar> > &BX
);
} // namespace RTOpPack
//
// Implementations
//
template<class Scalar>
void RTOpPack::getrf(
const SubMultiVectorView<Scalar> &A,
const ArrayView<int> &ipiv,
const Ptr<int> &rank
)
{
using Teuchos::as;
const int maxRank = TEUCHOS_MIN( A.subDim(), A.numSubCols() );
#ifdef TEUCHOS_DEBUG
TEST_FOR_EXCEPT( A.subDim() == 0 );
TEST_FOR_EXCEPT( A.numSubCols() == 0 );
TEST_FOR_EXCEPT( is_null(A.values()) );
TEUCHOS_ASSERT_EQUALITY( as<int>(ipiv.size()), maxRank );
#endif
Teuchos::LAPACK<int, Scalar> lapack;
int info = -1;
lapack.GETRF( A.subDim(), A.numSubCols(), A.values().get(), A.leadingDim(),
&ipiv[0], &info );
*rank = maxRank;
TEST_FOR_EXCEPTION(
info < 0, std::invalid_argument
,"getrf(...): Error, Invalid argument "
<< -info << " sent to LAPACK function xGETRF(...)" );
if (info > 0)
*rank = info - 1;
}
template<class Scalar>
void RTOpPack::getrs(
const ConstSubMultiVectorView<Scalar> &A,
const ArrayView<const int> &ipiv,
const ETransp transp,
const Ptr<const SubMultiVectorView<Scalar> > &BX
)
{
using Teuchos::as;
#ifdef TEUCHOS_DEBUG
TEUCHOS_ASSERT( !is_null(BX) );
TEUCHOS_ASSERT_EQUALITY( A.subDim(), BX->subDim() );
TEUCHOS_ASSERT_EQUALITY( A.subDim(), A.numSubCols() );
TEST_FOR_EXCEPT( A.subDim() == 0 );
TEST_FOR_EXCEPT( A.numSubCols() == 0 );
TEST_FOR_EXCEPT( is_null(A.values()) );
TEUCHOS_ASSERT_EQUALITY( A.subDim(), ipiv.size() );
#endif
Teuchos::LAPACK<int, Scalar> lapack;
int info = -1;
lapack.GETRS(
transpMap[transp],
A.subDim(), BX->numSubCols(), A.values().get(), A.leadingDim(),
&ipiv[0], BX->values().get(), BX->leadingDim(), &info
);
TEST_FOR_EXCEPTION(
info < 0, std::invalid_argument
,"getrs(...): Error, Invalid argument "
<< -info << " sent to LAPACK function xGETRS(...)" );
// If we get here B is the solution to the linear system.
}
#endif // RTOPPACK_LAPACK_WRAPPERS_HPP
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