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- // This file is part of Eigen, a lightweight C++ template library
- // for linear algebra.
- //
- // Copyright (C) 2012 Chen-Pang He <jdh8@ms63.hinet.net>
- //
- // This Source Code Form is subject to the terms of the Mozilla
- // Public License v. 2.0. If a copy of the MPL was not distributed
- // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
- #ifndef EIGEN_PACKED_TRIANGULAR_MATRIX_VECTOR_H
- #define EIGEN_PACKED_TRIANGULAR_MATRIX_VECTOR_H
- namespace internal {
- template<typename Index, int Mode, typename LhsScalar, bool ConjLhs, typename RhsScalar, bool ConjRhs, int StorageOrder>
- struct packed_triangular_matrix_vector_product;
- template<typename Index, int Mode, typename LhsScalar, bool ConjLhs, typename RhsScalar, bool ConjRhs>
- struct packed_triangular_matrix_vector_product<Index,Mode,LhsScalar,ConjLhs,RhsScalar,ConjRhs,ColMajor>
- {
- typedef typename ScalarBinaryOpTraits<LhsScalar, RhsScalar>::ReturnType ResScalar;
- enum {
- IsLower = (Mode & Lower) ==Lower,
- HasUnitDiag = (Mode & UnitDiag)==UnitDiag,
- HasZeroDiag = (Mode & ZeroDiag)==ZeroDiag
- };
- static void run(Index size, const LhsScalar* lhs, const RhsScalar* rhs, ResScalar* res, ResScalar alpha)
- {
- internal::conj_if<ConjRhs> cj;
- typedef Map<const Matrix<LhsScalar,Dynamic,1> > LhsMap;
- typedef typename conj_expr_if<ConjLhs,LhsMap>::type ConjLhsType;
- typedef Map<Matrix<ResScalar,Dynamic,1> > ResMap;
- for (Index i=0; i<size; ++i)
- {
- Index s = IsLower&&(HasUnitDiag||HasZeroDiag) ? 1 : 0;
- Index r = IsLower ? size-i: i+1;
- if (EIGEN_IMPLIES(HasUnitDiag||HasZeroDiag, (--r)>0))
- ResMap(res+(IsLower ? s+i : 0),r) += alpha * cj(rhs[i]) * ConjLhsType(LhsMap(lhs+s,r));
- if (HasUnitDiag)
- res[i] += alpha * cj(rhs[i]);
- lhs += IsLower ? size-i: i+1;
- }
- };
- };
- template<typename Index, int Mode, typename LhsScalar, bool ConjLhs, typename RhsScalar, bool ConjRhs>
- struct packed_triangular_matrix_vector_product<Index,Mode,LhsScalar,ConjLhs,RhsScalar,ConjRhs,RowMajor>
- {
- typedef typename ScalarBinaryOpTraits<LhsScalar, RhsScalar>::ReturnType ResScalar;
- enum {
- IsLower = (Mode & Lower) ==Lower,
- HasUnitDiag = (Mode & UnitDiag)==UnitDiag,
- HasZeroDiag = (Mode & ZeroDiag)==ZeroDiag
- };
- static void run(Index size, const LhsScalar* lhs, const RhsScalar* rhs, ResScalar* res, ResScalar alpha)
- {
- internal::conj_if<ConjRhs> cj;
- typedef Map<const Matrix<LhsScalar,Dynamic,1> > LhsMap;
- typedef typename conj_expr_if<ConjLhs,LhsMap>::type ConjLhsType;
- typedef Map<const Matrix<RhsScalar,Dynamic,1> > RhsMap;
- typedef typename conj_expr_if<ConjRhs,RhsMap>::type ConjRhsType;
- for (Index i=0; i<size; ++i)
- {
- Index s = !IsLower&&(HasUnitDiag||HasZeroDiag) ? 1 : 0;
- Index r = IsLower ? i+1 : size-i;
- if (EIGEN_IMPLIES(HasUnitDiag||HasZeroDiag, (--r)>0))
- res[i] += alpha * (ConjLhsType(LhsMap(lhs+s,r)).cwiseProduct(ConjRhsType(RhsMap(rhs+(IsLower ? 0 : s+i),r)))).sum();
- if (HasUnitDiag)
- res[i] += alpha * cj(rhs[i]);
- lhs += IsLower ? i+1 : size-i;
- }
- };
- };
- } // end namespace internal
- #endif // EIGEN_PACKED_TRIANGULAR_MATRIX_VECTOR_H
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