/usr/include/linbox/solutions/getentry.h is in liblinbox-dev 1.3.2-1.1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 | /* linbox/solutions/getentry.h
* Copyright(C) LinBox
* Evolved from an earlier one by Bradford Hovinen <hovinen@cis.udel.edu>
* -bds
*
*
* ========LICENCE========
* This file is part of the library LinBox.
*
* LinBox 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*.
*/
#ifndef __LINBOX_getentry_H
#define __LINBOX_getentry_H
#include <vector>
#include "linbox/util/debug.h"
#include "linbox/vector/vector-domain.h"
#include "linbox/matrix/blas-matrix.h"
#include "linbox/blackbox/sparse.h"
#include "linbox/blackbox/scalar-matrix.h"
#include "linbox/blackbox/compose.h"
#include "linbox/blackbox/diagonal.h"
#include "linbox/solutions/methods.h"
namespace LinBox
{
/// limited doc so far.
namespace GetEntryTags
{ struct GenericBB{};
struct Local{};
struct SpecialCDB{};
struct SpecialCBD{};
struct SpecialCDD{};
} // namespace GetEntryTags
template<class BB> struct GetEntryCategory { typedef GetEntryTags::GenericBB Tag; };
/** \brief
* Getting the i,j entry of the blackbox.
*/
template <class BB>
typename BB::Field::Element& getEntry(typename BB::Field::Element& x, const BB& A, const size_t i, const size_t j)
{
typename GetEntryCategory<BB>::Tag t;
return getEntry(x, A, i, j, t);
}
/// To ignore methods
template <class BB, class Method>
typename BB::Field::Element& getEntry(typename BB::Field::Element& x, const BB& A, const size_t i, const size_t j, Method & m)
{ return getEntry(x, A, i, j); }
// Generic BBs require use of apply.
template <class BB>
typename BB::Field::Element& getEntry(typename BB::Field::Element& x, const BB& A, const size_t i, const size_t j, GetEntryTags::GenericBB t)
{
typedef typename BB::Field Field;
typedef typename Field::Element Elt;
typedef std::vector<Elt> Vector;
const Field& F = A.field();
Elt zero; F.init(zero, 0UL);
Vector v(A.coldim(), zero), w(A.rowdim(), zero);
for (typename Vector::iterator it = v.begin (); it != v.end (); ++it)
F.assign (*it, zero);
F.init(v[j],1UL);
A.apply (w, v);
F.assign (x, VectorWrapper::constRef<Field, Vector> (w, i));
return x;
}
// BBs that offer a local getEntry.
template<class A, class B> struct GetEntryCategory<SparseMatrix<A,B> > { typedef GetEntryTags::Local Tag; };
template<class A, class B, class C> struct GetEntryCategory<SparseMatrixBase<A,B,C> > { typedef GetEntryTags::Local Tag; };
template<class Field, class Trait> struct GetEntryCategory<Diagonal<Field, Trait> > { typedef GetEntryTags::Local Tag; };
template<class Field> struct GetEntryCategory<ScalarMatrix<Field> > { typedef GetEntryTags::Local Tag; };
template <class BB>
typename BB::Field::Element& getEntry(typename BB::Field::Element& x, const BB& A, const size_t i, const size_t j, GetEntryTags::Local t )
{ return A.getEntry(x, i, j); }
// Compose< Diagonal, BB > specialization
template <class Field, class Trait, class BB>
struct GetEntryCategory<Compose<Diagonal<Field, Trait>,BB> > { typedef GetEntryTags::SpecialCDB Tag; };
template <class Field, class Trait, class BB>
typename Field::Element& getEntry(typename Field::Element& x, const Compose<Diagonal<Field, Trait>, BB>& A, const size_t i, const size_t j, GetEntryTags::SpecialCDB t)
{
typename Field::Element y;
getEntry(y, *(A.getLeftPtr()), i, i);
getEntry(x, *(A.getRightPtr()), i, j);
return A.field().mulin(x, y);
}
// Compose< BB, Diagonal > specialization
template <class BB, class Field, class Trait>
struct GetEntryCategory<Compose<BB, Diagonal<Field, Trait> > > { typedef GetEntryTags::SpecialCBD Tag; };
template <class BB, class Field, class Trait>
typename Field::Element& getEntry(typename Field::Element& x, const Compose<BB, Diagonal<Field, Trait> >& A, const size_t i, const size_t j, GetEntryTags::SpecialCBD t)
{
typename Field::Element y;
getEntry(y, *(A.getLeftPtr()), i, j);
getEntry(x, *(A.getRightPtr()), j, j);
return A.field().mulin(x, y);
}
// Compose< Diagonal, Diagonal > specialization
template <class Field, class T1, class T2>
struct GetEntryCategory<Compose<Diagonal<Field, T1>,Diagonal<Field, T2> > > { typedef GetEntryTags::SpecialCDD Tag; };
template <class Field, class T1, class T2>
typename Field::Element& getEntry(typename Field::Element& x, const Compose<Diagonal<Field,T1>, Diagonal<Field, T2> >& A, const size_t i, const size_t j, GetEntryTags::SpecialCDD t)
{
if (i != j)
return A.field().init(x, 0UL);
else {
typename Field::Element y;
getEntry(y, *(A.getLeftPtr()), i, i);
getEntry(x, *(A.getRightPtr()), j, j);
return A.field().mulin(x, y);
}
}
}
#endif // __LINBOX_getentry_H
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