1 // This file is part of Eigen, a lightweight C++ template library
2 // for linear algebra.
3 //
4 // Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr>
5 //
6 // This Source Code Form is subject to the terms of the Mozilla
7 // Public License v. 2.0. If a copy of the MPL was not distributed
8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 
10 #ifndef EIGEN_SPARSE_BLOCKFORDYNAMICMATRIX_H
11 #define EIGEN_SPARSE_BLOCKFORDYNAMICMATRIX_H
12 
13 namespace Eigen {
14 
15 #if 0
16 
17 // NOTE Have to be reimplemented as a specialization of BlockImpl< DynamicSparseMatrix<_Scalar, _Options, _Index>, ... >
18 // See SparseBlock.h for an example
19 
20 
21 /***************************************************************************
22 * specialisation for DynamicSparseMatrix
23 ***************************************************************************/
24 
25 template<typename _Scalar, int _Options, typename _Index, int Size>
26 class SparseInnerVectorSet<DynamicSparseMatrix<_Scalar, _Options, _Index>, Size>
27   : public SparseMatrixBase<SparseInnerVectorSet<DynamicSparseMatrix<_Scalar, _Options, _Index>, Size> >
28 {
29     typedef DynamicSparseMatrix<_Scalar, _Options, _Index> MatrixType;
30   public:
31 
32     enum { IsRowMajor = internal::traits<SparseInnerVectorSet>::IsRowMajor };
33 
34     EIGEN_SPARSE_PUBLIC_INTERFACE(SparseInnerVectorSet)
35     class InnerIterator: public MatrixType::InnerIterator
36     {
37       public:
38         inline InnerIterator(const SparseInnerVectorSet& xpr, Index outer)
39           : MatrixType::InnerIterator(xpr.m_matrix, xpr.m_outerStart + outer), m_outer(outer)
40         {}
41         inline Index row() const { return IsRowMajor ? m_outer : this->index(); }
42         inline Index col() const { return IsRowMajor ? this->index() : m_outer; }
43       protected:
44         Index m_outer;
45     };
46 
47     inline SparseInnerVectorSet(const MatrixType& matrix, Index outerStart, Index outerSize)
48       : m_matrix(matrix), m_outerStart(outerStart), m_outerSize(outerSize)
49     {
50       eigen_assert( (outerStart>=0) && ((outerStart+outerSize)<=matrix.outerSize()) );
51     }
52 
53     inline SparseInnerVectorSet(const MatrixType& matrix, Index outer)
54       : m_matrix(matrix), m_outerStart(outer), m_outerSize(Size)
55     {
56       eigen_assert(Size!=Dynamic);
57       eigen_assert( (outer>=0) && (outer<matrix.outerSize()) );
58     }
59 
60     template<typename OtherDerived>
61     inline SparseInnerVectorSet& operator=(const SparseMatrixBase<OtherDerived>& other)
62     {
63       if (IsRowMajor != ((OtherDerived::Flags&RowMajorBit)==RowMajorBit))
64       {
65         // need to transpose => perform a block evaluation followed by a big swap
66         DynamicSparseMatrix<Scalar,IsRowMajor?RowMajorBit:0> aux(other);
67         *this = aux.markAsRValue();
68       }
69       else
70       {
71         // evaluate/copy vector per vector
72         for (Index j=0; j<m_outerSize.value(); ++j)
73         {
74           SparseVector<Scalar,IsRowMajor ? RowMajorBit : 0> aux(other.innerVector(j));
75           m_matrix.const_cast_derived()._data()[m_outerStart+j].swap(aux._data());
76         }
77       }
78       return *this;
79     }
80 
81     inline SparseInnerVectorSet& operator=(const SparseInnerVectorSet& other)
82     {
83       return operator=<SparseInnerVectorSet>(other);
84     }
85 
86     Index nonZeros() const
87     {
88       Index count = 0;
89       for (Index j=0; j<m_outerSize.value(); ++j)
90         count += m_matrix._data()[m_outerStart+j].size();
91       return count;
92     }
93 
94     const Scalar& lastCoeff() const
95     {
96       EIGEN_STATIC_ASSERT_VECTOR_ONLY(SparseInnerVectorSet);
97       eigen_assert(m_matrix.data()[m_outerStart].size()>0);
98       return m_matrix.data()[m_outerStart].vale(m_matrix.data()[m_outerStart].size()-1);
99     }
100 
101 //     template<typename Sparse>
102 //     inline SparseInnerVectorSet& operator=(const SparseMatrixBase<OtherDerived>& other)
103 //     {
104 //       return *this;
105 //     }
106 
107     EIGEN_STRONG_INLINE Index rows() const { return IsRowMajor ? m_outerSize.value() : m_matrix.rows(); }
108     EIGEN_STRONG_INLINE Index cols() const { return IsRowMajor ? m_matrix.cols() : m_outerSize.value(); }
109 
110   protected:
111 
112     const typename MatrixType::Nested m_matrix;
113     Index m_outerStart;
114     const internal::variable_if_dynamic<Index, Size> m_outerSize;
115 
116 };
117 
118 #endif
119 
120 } // end namespace Eigen
121 
122 #endif // EIGEN_SPARSE_BLOCKFORDYNAMICMATRIX_H
123