/usr/include/linbox/blackbox/dif.h is in liblinbox-dev 1.4.2-3.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | /* linbox/blackbox/dif.h
* Copyright (c) 2010 LinBox
* transmuted from linbox/blackbox/sum.h by bds
* Modified by JG Dumas
*
* It will be desirable to keep sum.h and dif.h in sync.
*
* Time-stamp: <18 Jun 10 15:28:48 Jean-Guillaume.Dumas@imag.fr>
*
* ------------------------------------
*
*
* ========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_dif_H
#define __LINBOX_dif_H
#include "linbox/vector/vector-domain.h"
#include "linbox/util/debug.h"
#include "linbox/blackbox/blackbox-interface.h"
// Namespace in which all LinBox library code resides
namespace LinBox
{
/** Blackbox of a difference: <code>C := A - B</code>, i.e <code>Cx = Ax - Bx</code>.
*
* <b> Template parameters</b>:
* Field is the class of the entry domain,
* Vector is a LinBox dense or sparse vector of field elements class.
\ingroup blackbox
*/
template <class _Blackbox1, class _Blackbox2>
class Dif : public BlackboxInterface {
typedef Dif<_Blackbox1, _Blackbox2> Self_t;
public:
typedef _Blackbox1 Blackbox1;
typedef _Blackbox2 Blackbox2;
typedef typename Blackbox1::Field Field;
typedef typename Blackbox1::Element Element;
/** Build this as A - B from blackboxes A, B.
* A and B must have the same shape and be over the same field.
* Their data is not copied. A subsequent change to one of them also changes
* this difference.
*/
Dif (const Blackbox1 &A, const Blackbox2 &B) :
_A_ptr(&A), _B_ptr(&B)
{
// create new copies of matrices in dynamic memory
linbox_check (A.coldim () == B.coldim ());
linbox_check (A.rowdim () == B.rowdim ());
VectorWrapper::ensureDim (_z1, _A_ptr->rowdim ());
VectorWrapper::ensureDim (_z2, _A_ptr->coldim ());
}
/** Build this as A - B from blackbox pointers A_ptr, B_ptr.
* The two matrices must have the same shape and be over the same field.
* Their data <i>is</i> copied. I don't know why.
*/
Dif (const Blackbox1 *A_ptr, const Blackbox2 *B_ptr) :
_A_ptr(A_ptr),_B_ptr(B_ptr)
{
// create new copies of matrices in dynamic memory
linbox_check (A_ptr != 0);
linbox_check (B_ptr != 0);
linbox_check (A_ptr->coldim () == B_ptr->coldim ());
linbox_check (A_ptr->rowdim () == B_ptr->rowdim ());
// _A_ptr = A_ptr->clone ();
// _B_ptr = B_ptr->clone ();
VectorWrapper::ensureDim (_z1, A_ptr->rowdim ());
VectorWrapper::ensureDim (_z2, A_ptr->coldim ());
}
/** Makes a deep copy.
* Creates new black box objects in dynamic memory.
* @param M constant reference to compose black box matrix
*/
Dif (const Dif<Blackbox1, Blackbox2> &M) :
_A_ptr (M._A_ptr), _B_ptr (M._B_ptr)
{
VectorWrapper::ensureDim (_z1, _A_ptr->rowdim ());
VectorWrapper::ensureDim (_z2, _A_ptr->coldim ());
}
/// Destructor
~Dif (void)
{
}
/** Application of BlackBox matrix.
* <code>y= (A+B)*x</code>.
* Requires one vector conforming to the \ref LinBox
* vector @link Archetypes archetype@endlink.
* Required by abstract base class.
* @return reference to vector y containing output.
* @param x constant reference to vector to contain input
* @param y
*/
template<class OutVector, class InVector>
inline OutVector &apply (OutVector &y, const InVector &x) const
{
if ((_A_ptr != 0) && (_B_ptr != 0)) {
VectorDomain<Field> VD (_A_ptr->field());
_A_ptr->apply (y, x);
_B_ptr->apply (_z1, x);
VD.subin(y, _z1);
}
return y;
}
/** Application of BlackBox matrix transpose.
* <code>y= transpose(A+B)*x</code>.
* Requires one vector conforming to the \ref LinBox
* vector @link Archetypes archetype@endlink.
* Required by abstract base class.
* @return reference to vector y containing output.
* @param x constant reference to vector to contain input
* @param y
*/
template<class OutVector, class InVector>
inline OutVector &applyTranspose (OutVector &y, const InVector &x) const
{
if ((_A_ptr != 0) && (_B_ptr != 0)) {
VectorDomain<Field> VD (_A_ptr->field());
_A_ptr->applyTranspose (y, x);
_B_ptr->applyTranspose (_z2, x);
VD.subin (y, _z2);
}
return y;
}
template<typename _Tp1, typename _Tp2 = _Tp1>
struct rebind {
// DiffOwner ???
typedef Dif<
typename Blackbox1::template rebind<_Tp1>::other,
typename Blackbox2::template rebind<_Tp2>::other
> other;
void operator() (other & Ap, const Self_t& A)
{
typename Blackbox1::template rebind<_Tp1> () ( *(Ap._A_ptr), *(A._A_ptr));
typename Blackbox2::template rebind<_Tp2> () ( *(Ap._B_ptr), *(A._B_ptr));
}
};
/** Retreive row dimensions of BlackBox matrix.
* This may be needed for applying preconditioners.
* Required by abstract base class.
* @return integer number of rows of black box matrix.
*/
size_t rowdim (void) const
{ return _A_ptr->rowdim (); }
/** Retreive column dimensions of BlackBox matrix.
* Required by abstract base class.
* @return integer number of columns of black box matrix.
*/
size_t coldim (void) const
{ return _A_ptr->coldim (); }
const Field& field() const {return _A_ptr->field();}
private:
const Blackbox1 *_A_ptr;
const Blackbox2 *_B_ptr;
mutable std::vector<Element> _z1;
mutable std::vector<Element> _z2;
};
} // namespace LinBox
#endif // __LINBOX_dif_H
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