1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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2 | /* $Id$ */ |
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3 | |
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4 | #include <config.h> |
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5 | |
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6 | #include <time.h> |
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7 | |
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8 | #include "assert.h" |
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9 | |
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10 | #include "cf_defs.h" |
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11 | #include "cf_random.h" |
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12 | #include "ffops.h" |
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13 | #include "gfops.h" |
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14 | #include "imm.h" |
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15 | |
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16 | class RandomGenerator { |
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17 | private: |
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18 | const int ia, im, iq, ir, deflt; |
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19 | int s; |
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20 | |
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21 | // s must not equal zero! |
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22 | void seedInit( int ss ) { s = ((ss == 0) ? deflt : ss); } |
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23 | public: |
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24 | RandomGenerator(); |
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25 | RandomGenerator( int ss ); |
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26 | ~RandomGenerator() {} |
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27 | int generate(); |
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28 | void seed( int ss ) { seedInit( ss ); } |
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29 | }; |
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30 | |
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31 | RandomGenerator::RandomGenerator() : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
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32 | { |
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33 | seedInit( (int)time( 0 ) ); |
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34 | } |
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35 | |
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36 | RandomGenerator::RandomGenerator( int ss ) : ia(16807), im(2147483647), iq(127773), ir(2836), deflt(123459876) |
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37 | { |
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38 | seedInit( ss ); |
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39 | } |
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40 | |
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41 | int |
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42 | RandomGenerator::generate() |
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43 | { |
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44 | int k; |
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45 | |
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46 | k = s/iq; |
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47 | s = ia*(s-k*iq)-ir*k; |
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48 | if ( s < 0 ) s += im; |
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49 | |
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50 | return s; |
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51 | } |
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52 | |
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53 | RandomGenerator ranGen; |
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54 | |
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55 | CanonicalForm FFRandom::generate () const |
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56 | { |
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57 | return CanonicalForm( int2imm_p( factoryrandom( ff_prime ) ) ); |
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58 | } |
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59 | |
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60 | CFRandom * FFRandom::clone () const |
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61 | { |
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62 | return new FFRandom(); |
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63 | } |
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64 | |
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65 | CanonicalForm GFRandom::generate () const |
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66 | { |
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67 | int i= factoryrandom( gf_q ); |
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68 | if ( i == gf_q1 ) i++; |
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69 | return CanonicalForm( int2imm_gf( i ) ); |
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70 | } |
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71 | |
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72 | CFRandom * GFRandom::clone () const |
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73 | { |
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74 | return new GFRandom(); |
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75 | } |
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76 | |
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77 | |
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78 | IntRandom::IntRandom() |
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79 | { |
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80 | max = 50; |
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81 | } |
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82 | |
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83 | IntRandom::IntRandom( int m ) |
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84 | { |
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85 | max = m; |
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86 | } |
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87 | |
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88 | IntRandom::~IntRandom() {} |
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89 | |
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90 | CanonicalForm IntRandom::generate() const |
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91 | { |
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92 | return factoryrandom( 2*max )-max; |
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93 | } |
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94 | |
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95 | CFRandom * IntRandom::clone() const |
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96 | { |
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97 | return new IntRandom( max ); |
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98 | } |
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99 | |
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100 | AlgExtRandomF::AlgExtRandomF() |
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101 | { |
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102 | ASSERT( 0, "not a valid random generator" ); |
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103 | } |
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104 | |
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105 | AlgExtRandomF::AlgExtRandomF( const AlgExtRandomF & ) |
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106 | { |
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107 | ASSERT( 0, "not a valid random generator" ); |
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108 | } |
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109 | |
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110 | AlgExtRandomF& AlgExtRandomF::operator= ( const AlgExtRandomF & ) |
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111 | { |
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112 | ASSERT( 0, "not a valid random generator" ); |
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113 | return *this; |
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114 | } |
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115 | |
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116 | AlgExtRandomF::AlgExtRandomF( const Variable & v ) |
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117 | { |
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118 | ASSERT( v.level() < 0, "not an algebraic extension" ); |
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119 | algext = v; |
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120 | n = degree( getMipo( v ) ); |
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121 | gen = CFRandomFactory::generate(); |
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122 | } |
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123 | |
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124 | AlgExtRandomF::AlgExtRandomF( const Variable & v1, const Variable & v2 ) |
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125 | { |
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126 | ASSERT( v1.level() < 0 && v2.level() < 0 && v1 != v2, "not an algebraic extension" ); |
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127 | algext = v2; |
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128 | n = degree( getMipo( v2 ) ); |
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129 | gen = new AlgExtRandomF( v1 ); |
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130 | } |
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131 | |
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132 | AlgExtRandomF::AlgExtRandomF( const Variable & v, CFRandom * g, int nn ) |
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133 | { |
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134 | algext = v; |
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135 | n = nn; |
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136 | gen = g; |
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137 | } |
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138 | |
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139 | AlgExtRandomF::~AlgExtRandomF() |
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140 | { |
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141 | delete gen; |
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142 | } |
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143 | |
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144 | CanonicalForm AlgExtRandomF::generate() const |
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145 | { |
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146 | CanonicalForm result; |
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147 | for ( int i = 0; i < n; i++ ) |
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148 | result += power( algext, i ) * gen->generate(); |
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149 | return result; |
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150 | }; |
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151 | |
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152 | CFRandom * AlgExtRandomF::clone () const |
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153 | { |
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154 | return new AlgExtRandomF( algext, gen->clone(), n ); |
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155 | } |
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156 | |
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157 | CFRandom * CFRandomFactory::generate() |
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158 | { |
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159 | if ( getCharacteristic() == 0 ) |
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160 | return new IntRandom(); |
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161 | if ( getGFDegree() > 1 ) |
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162 | return new GFRandom(); |
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163 | else |
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164 | return new FFRandom(); |
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165 | } |
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166 | |
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167 | int factoryrandom( int n ) |
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168 | { |
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169 | if ( n == 0 ) |
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170 | return (int)ranGen.generate(); |
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171 | else |
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172 | return ranGen.generate() % n; |
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173 | } |
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174 | |
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175 | void factoryseed ( int s ) |
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176 | { |
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177 | ranGen.seed( s ); |
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178 | } |
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