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| #ifndef EIGEN_SPARSEVIEW_H |
| #define EIGEN_SPARSEVIEW_H |
|
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| namespace Eigen { |
|
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| namespace internal { |
|
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| template<typename MatrixType> |
| struct traits<SparseView<MatrixType> > : traits<MatrixType> |
| { |
| typedef typename MatrixType::StorageIndex StorageIndex; |
| typedef Sparse StorageKind; |
| enum { |
| Flags = int(traits<MatrixType>::Flags) & (RowMajorBit) |
| }; |
| }; |
|
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| } |
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| template<typename MatrixType> |
| class SparseView : public SparseMatrixBase<SparseView<MatrixType> > |
| { |
| typedef typename MatrixType::Nested MatrixTypeNested; |
| typedef typename internal::remove_all<MatrixTypeNested>::type _MatrixTypeNested; |
| typedef SparseMatrixBase<SparseView > Base; |
| public: |
| EIGEN_SPARSE_PUBLIC_INTERFACE(SparseView) |
| typedef typename internal::remove_all<MatrixType>::type NestedExpression; |
|
|
| explicit SparseView(const MatrixType& mat, const Scalar& reference = Scalar(0), |
| const RealScalar &epsilon = NumTraits<Scalar>::dummy_precision()) |
| : m_matrix(mat), m_reference(reference), m_epsilon(epsilon) {} |
|
|
| inline Index rows() const { return m_matrix.rows(); } |
| inline Index cols() const { return m_matrix.cols(); } |
|
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| inline Index innerSize() const { return m_matrix.innerSize(); } |
| inline Index outerSize() const { return m_matrix.outerSize(); } |
| |
| |
| const typename internal::remove_all<MatrixTypeNested>::type& |
| nestedExpression() const { return m_matrix; } |
| |
| Scalar reference() const { return m_reference; } |
| RealScalar epsilon() const { return m_epsilon; } |
| |
| protected: |
| MatrixTypeNested m_matrix; |
| Scalar m_reference; |
| RealScalar m_epsilon; |
| }; |
|
|
| namespace internal { |
|
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| |
| template<typename ArgType> |
| struct unary_evaluator<SparseView<ArgType>, IteratorBased> |
| : public evaluator_base<SparseView<ArgType> > |
| { |
| typedef typename evaluator<ArgType>::InnerIterator EvalIterator; |
| public: |
| typedef SparseView<ArgType> XprType; |
| |
| class InnerIterator : public EvalIterator |
| { |
| protected: |
| typedef typename XprType::Scalar Scalar; |
| public: |
|
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| EIGEN_STRONG_INLINE InnerIterator(const unary_evaluator& sve, Index outer) |
| : EvalIterator(sve.m_argImpl,outer), m_view(sve.m_view) |
| { |
| incrementToNonZero(); |
| } |
|
|
| EIGEN_STRONG_INLINE InnerIterator& operator++() |
| { |
| EvalIterator::operator++(); |
| incrementToNonZero(); |
| return *this; |
| } |
|
|
| using EvalIterator::value; |
|
|
| protected: |
| const XprType &m_view; |
|
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| private: |
| void incrementToNonZero() |
| { |
| while((bool(*this)) && internal::isMuchSmallerThan(value(), m_view.reference(), m_view.epsilon())) |
| { |
| EvalIterator::operator++(); |
| } |
| } |
| }; |
| |
| enum { |
| CoeffReadCost = evaluator<ArgType>::CoeffReadCost, |
| Flags = XprType::Flags |
| }; |
| |
| explicit unary_evaluator(const XprType& xpr) : m_argImpl(xpr.nestedExpression()), m_view(xpr) {} |
|
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| protected: |
| evaluator<ArgType> m_argImpl; |
| const XprType &m_view; |
| }; |
|
|
| template<typename ArgType> |
| struct unary_evaluator<SparseView<ArgType>, IndexBased> |
| : public evaluator_base<SparseView<ArgType> > |
| { |
| public: |
| typedef SparseView<ArgType> XprType; |
| protected: |
| enum { IsRowMajor = (XprType::Flags&RowMajorBit)==RowMajorBit }; |
| typedef typename XprType::Scalar Scalar; |
| typedef typename XprType::StorageIndex StorageIndex; |
| public: |
| |
| class InnerIterator |
| { |
| public: |
|
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| EIGEN_STRONG_INLINE InnerIterator(const unary_evaluator& sve, Index outer) |
| : m_sve(sve), m_inner(0), m_outer(outer), m_end(sve.m_view.innerSize()) |
| { |
| incrementToNonZero(); |
| } |
|
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| EIGEN_STRONG_INLINE InnerIterator& operator++() |
| { |
| m_inner++; |
| incrementToNonZero(); |
| return *this; |
| } |
|
|
| EIGEN_STRONG_INLINE Scalar value() const |
| { |
| return (IsRowMajor) ? m_sve.m_argImpl.coeff(m_outer, m_inner) |
| : m_sve.m_argImpl.coeff(m_inner, m_outer); |
| } |
|
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| EIGEN_STRONG_INLINE StorageIndex index() const { return m_inner; } |
| inline Index row() const { return IsRowMajor ? m_outer : index(); } |
| inline Index col() const { return IsRowMajor ? index() : m_outer; } |
|
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| EIGEN_STRONG_INLINE operator bool() const { return m_inner < m_end && m_inner>=0; } |
|
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| protected: |
| const unary_evaluator &m_sve; |
| Index m_inner; |
| const Index m_outer; |
| const Index m_end; |
|
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| private: |
| void incrementToNonZero() |
| { |
| while((bool(*this)) && internal::isMuchSmallerThan(value(), m_sve.m_view.reference(), m_sve.m_view.epsilon())) |
| { |
| m_inner++; |
| } |
| } |
| }; |
| |
| enum { |
| CoeffReadCost = evaluator<ArgType>::CoeffReadCost, |
| Flags = XprType::Flags |
| }; |
| |
| explicit unary_evaluator(const XprType& xpr) : m_argImpl(xpr.nestedExpression()), m_view(xpr) {} |
|
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| protected: |
| evaluator<ArgType> m_argImpl; |
| const XprType &m_view; |
| }; |
|
|
| } |
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| template<typename Derived> |
| const SparseView<Derived> MatrixBase<Derived>::sparseView(const Scalar& reference, |
| const typename NumTraits<Scalar>::Real& epsilon) const |
| { |
| return SparseView<Derived>(derived(), reference, epsilon); |
| } |
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| template<typename Derived> |
| const SparseView<Derived> |
| SparseMatrixBase<Derived>::pruned(const Scalar& reference, |
| const RealScalar& epsilon) const |
| { |
| return SparseView<Derived>(derived(), reference, epsilon); |
| } |
|
|
| } |
|
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| #endif |
|
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