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/*
* Copyright (c) 2012, Michael Lehn, Klaus Pototzky * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1) Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2) Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3) Neither the name of the FLENS development group nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* Based on * SUBROUTINE DTBTRS( UPLO, TRANS, DIAG, N, KD, NRHS, AB, LDAB, B, $ LDB, INFO ) SUBROUTINE ZTBTRS( UPLO, TRANS, DIAG, N, KD, NRHS, AB, LDAB, B, $ LDB, INFO ) * * -- LAPACK routine (version 3.3.1) -- * -- LAPACK is a software package provided by Univ. of Tennessee, -- * -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..-- * -- April 2011 -- * */ #ifndef FLENS_LAPACK_TB_TRS_TCC #define FLENS_LAPACK_TB_TRS_TCC 1 #include <flens/blas/blas.h> #include <flens/lapack/lapack.h> namespace flens { namespace lapack { //== interface for external lapack ============================================= #ifdef USE_CXXLAPACK namespace external { //-- (tb)trs [real and complex variant] ---------------------------------------- template <typename MA, typename MB> typename TbMatrix<MA>::IndexType trs_impl(Transpose trans, const TbMatrix<MA> &A, GeMatrix<MB> &B) { typedef typename TbMatrix<MA>::IndexType IndexType; IndexType info; info = cxxlapack::tbtrs<IndexType>(getF77Char(A.upLo()), getF77Char(trans), getF77Char(A.diag()), A.dim(), A.numOffDiags(), B.numCols(), A.data(), A.leadingDimension(), B.data(), B.leadingDimension()); ASSERT(info>=0); return info; } } // namespace external #endif // USE_CXXLAPACK //== public interface ========================================================== #ifdef USE_CXXLAPACK //-- (tb)trs [real and complex variant] ---------------------------------------- template <typename MA, typename MB> typename RestrictTo<IsTbMatrix<MA>::value && IsGeMatrix<MB>::value, typename RemoveRef<MA>::Type::IndexType>::Type trs(Transpose trans, const MA &A, MB &&B) { LAPACK_DEBUG_OUT("(tb)trs [real/complex]"); // // Remove references from rvalue types // typedef typename RemoveRef<MA>::Type MatrixA; typedef typename MatrixA::IndexType IndexType; typedef typename RemoveRef<MB>::Type MatrixB; // // Test the input parameters // # ifndef NDEBUG ASSERT(A.firstRow()==1); ASSERT(A.firstCol()==1); const IndexType n = A.dim(); ASSERT(B.firstRow()==1); ASSERT(B.firstCol()==1); ASSERT(B.numRows()==n); # endif // // Call implementation // IndexType info = external::trs_impl(trans, A, B); return info; } //-- (tb)trs [variant if rhs is vector] ---------------------------------------- template <typename MA, typename VB> typename RestrictTo<IsTbMatrix<MA>::value && IsDenseVector<VB>::value, typename RemoveRef<MA>::Type::IndexType>::Type trs(Transpose trans, const MA &A, VB &&b) { // // Remove references from rvalue types // typedef typename RemoveRef<MA>::Type MatrixA; typedef typename RemoveRef<VB>::Type VectorB; // // Create matrix view from vector b and call above variant // typedef typename VectorB::ElementType ElementType; typedef typename VectorB::IndexType IndexType; const IndexType n = b.length(); const StorageOrder order = MatrixA::Engine::order; GeMatrix<FullStorageView<ElementType, order> > B(n, 1, b, n); return trs(trans, A, B); } #endif // USE_CXXLAPACK } } // namespace lapack, flens #endif // FLENS_LAPACK_TB_TRS_TCC |