/usr/include/linbox/vector/stream-gf2.h is in liblinbox-dev 1.3.2-1.1build2.
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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 | /* linbox/vector/stream.h
* Copyright (C) 2002 Bradford Hovinen
*
* Written by Bradford Hovinen <hovinen@cis.udel.edu>
*
* ------------------------------------
* 2003-02-03 Bradford Hovinen <bghovinen@math.uwaterloo.ca>
*
* RandomSparseStream::RandomSparseStream: put probability parameter before
* vector dimension
* ------------------------------------
* 2002-09-05 Bradford Hovinen <bghovine@math.uwaterloo.ca>
*
* - Renamed to stream.h and moved to linbox/vector
* - VectorFactory is now called VectorStream, which fits its purpose
* somewhat better
* - The interface is now closer to the interface for istream
* - RandomDenseVectorFactory, et al. are refactored into classes
* parameterized on the vector type and specialized appropriately. This
* allows, e.g. construction of a random dense vector in sparse
* representation and so on.
* - New constructor interface for RandomSparseStream accepts proportion of
* nonzero entries; removed existing constructors
* - Reindented, since the other changes are so numerous that diffs aren't a
* big deal anyway
*
* ------------------------------------
* 2002-05-18 Bradford Hovinen <hovinen@cis.udel.edu>
*
* Refactor: Create one class StandardBasisFactory, parameterized by vector
* type, with specializations for dense, sparse map, and sparse associative
* vectors.
*
* ------------------------------------
* Modified by Dmitriy Morozov <linbox@foxcub.org>. May 27, 2002.
*
* Added parametrization of the VectorCategroy tags by VectorTraits (see
* vector-traits.h for more details).
*
* ------------------------------------
*
*
* ========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========
*.
*/
/**
* @file vector/stream.h
*
* @brief Generation of sequences of random vectors.
*
* Random, sparse, basis vectors,...
*/
#ifndef __LINBOX_vector_stream_gf2_H
#define __LINBOX_vector_stream_gf2_H
#include <vector>
#include <cmath>
#include "linbox/field/gf2.h"
#include "linbox/vector/stream.h"
namespace LinBox
{ /* RandomDenseStream */
class RandomDenseStreamGF2 : public VectorStream<BitVector> {
public:
typedef BitVector Vector;
RandomDenseStreamGF2 (const GF2 &, uint32_t seed, size_t nn, size_t mm = 0) :
MT (seed), _n (nn), _m (mm), _j (0)
{}
Vector &get (Vector &v)
{
Vector::word_iterator i;
if (_m > 0 && _j++ >= _m)
return v;
for (i = v.wordBegin (); i != v.wordEnd (); i++)
*i = MTrandomInt<__LINBOX_BITSOF_LONG>()(MT);
const size_t zeroing = __LINBOX_BITSOF_LONG - (v.size() % __LINBOX_BITSOF_LONG);
*(v.wordRbegin()) <<= zeroing;
*(v.wordRbegin()) >>= zeroing;
return v;
}
size_t size () const
{ return _m; }
size_t pos () const
{ return _j; }
size_t dim () const
{ return _n; }
operator bool () const
{ return _m == 0 || _j < _m; }
void reset () { _j = 0; }
private:
MersenneTwister MT;
size_t _n;
size_t _m;
size_t _j;
};
}
// Specialization of RandomSparseStream
namespace LinBox
{ /* RandomSparseStream */
template <class _Vector = Vector<GF2>::Sparse>
class RandomSparseStreamGF2 : public VectorStream<_Vector> {
public:
typedef GF2 Field;
typedef _Vector Vector;
RandomSparseStreamGF2 (const GF2 &, uint32_t seed, double p, size_t N, size_t M = 0) :
MT (seed), _n (N), _m (M), _j (0)
{ setP (p); }
RandomSparseStreamGF2 (const GF2 &F, const GF2RandIter& r, double p, size_t N, size_t M = 0) :
MT (r.getMT()), _n (N), _m (M), _j (0)
{ setP (p); }
Vector &get (Vector &v);
size_t size () const
{ return _m; }
size_t pos () const
{ return _j; }
size_t dim () const
{ return _n; }
operator bool () const
{ return _m == 0 || _j < _m; }
void reset () { _j = 0; }
void setP (double p)
{
linbox_check ((p >= 0.0) && (p <= 1.0));
_p = p;
_1_log_1mp = 1 / log (1 - _p);
}
private:
MersenneTwister MT;
size_t _n;
double _p;
double _1_log_1mp;
size_t _m;
size_t _j;
};
template <class _Vector>
_Vector &RandomSparseStreamGF2<_Vector>::get (_Vector &v)
{
size_t i = (size_t) -1;
double val;
int skip;
if (_m > 0 && _j++ >= _m)
return v;
v.clear ();
while (1) {
val = (double) MT.randomDouble ();
skip = (int) (ceil (log (val) * _1_log_1mp));
if (skip <= 0)
i++;
else
i += (size_t) skip;
if (i >= _n) break;
v.push_back (i);
}
return v;
}
}
#endif // __LINBOX_vector_stream_H
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