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1 /* |
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2 |
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3 Copyright (C) 2003 John W. Eaton |
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4 |
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5 This file is part of Octave. |
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6 |
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7 Octave is free software; you can redistribute it and/or modify it |
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8 under the terms of the GNU General Public License as published by the |
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9 Free Software Foundation; either version 2, or (at your option) any |
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10 later version. |
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11 |
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12 Octave is distributed in the hope that it will be useful, but WITHOUT |
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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15 for more details. |
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16 |
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17 You should have received a copy of the GNU General Public License |
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18 along with Octave; see the file COPYING. If not, write to the Free |
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19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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20 |
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21 */ |
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22 |
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23 #ifdef HAVE_CONFIG_H |
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24 #include <config.h> |
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25 #endif |
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26 |
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27 #include "f77-fcn.h" |
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28 #include "lo-error.h" |
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29 #include "oct-rand.h" |
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30 |
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31 // Possible distributions of random numbers. This was handled with an |
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32 // enum, but unwind_protecting that doesn't work so well. |
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33 #define uniform_dist 1 |
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34 #define normal_dist 2 |
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35 |
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36 // Current distribution of random numbers. |
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37 static int current_distribution = uniform_dist; |
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38 |
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39 // Has the seed been set yet? |
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40 static bool initialized = false; |
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41 |
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42 extern "C" |
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43 { |
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44 int F77_FUNC (dgennor, DGENNOR) (const double&, const double&, |
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45 double&); |
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46 |
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47 int F77_FUNC (dgenunf, DGENUNF) (const double&, const double&, |
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48 double&); |
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49 |
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50 int F77_FUNC (setall, SETALL) (const int&, const int&); |
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51 |
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52 int F77_FUNC (getsd, GETSD) (int&, int&); |
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53 |
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54 int F77_FUNC (setsd, SETSD) (const int&, const int&); |
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55 |
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56 int F77_FUNC (setcgn, SETCGN) (const int&); |
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57 } |
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58 |
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59 static int |
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60 force_to_fit_range (int i, int lo, int hi) |
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61 { |
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62 assert (hi > lo && lo >= 0 && hi > lo); |
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63 |
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64 i = i > 0 ? i : -i; |
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65 |
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66 if (i < lo) |
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67 i = lo; |
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68 else if (i > hi) |
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69 i = i % hi; |
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70 |
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71 return i; |
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72 } |
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73 |
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74 // Make the random number generator give us a different sequence every |
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75 // time we start octave unless we specifically set the seed. The |
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76 // technique used below will cycle monthly, but it it does seem to |
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77 // work ok to give fairly different seeds each time Octave starts. |
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78 |
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79 static void |
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80 do_initialization (void) |
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81 { |
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82 time_t now; |
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83 struct tm *tm; |
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84 |
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85 time (&now); |
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86 tm = localtime (&now); |
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87 |
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88 int hour = tm->tm_hour + 1; |
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89 int minute = tm->tm_min + 1; |
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90 int second = tm->tm_sec + 1; |
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91 |
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92 int s0 = tm->tm_mday * hour * minute * second; |
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93 int s1 = hour * minute * second; |
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94 |
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95 s0 = force_to_fit_range (s0, 1, 2147483563); |
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96 s1 = force_to_fit_range (s1, 1, 2147483399); |
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97 |
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98 F77_FUNC (setall, SETALL) (s0, s1); |
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99 |
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100 initialized = true; |
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101 } |
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102 |
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103 static inline void |
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104 maybe_initialize (void) |
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105 { |
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106 if (! initialized) |
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107 do_initialization (); |
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108 } |
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109 |
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110 double |
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111 octave_rand::seed (void) |
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112 { |
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113 maybe_initialize (); |
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114 |
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115 union d2i { double d; int i[2]; }; |
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116 union d2i u; |
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117 F77_FUNC (getsd, GETSD) (u.i[0], u.i[1]); |
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118 return u.d; |
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119 } |
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120 |
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121 void |
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122 octave_rand::seed (double s) |
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123 { |
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124 maybe_initialize (); |
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125 |
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126 union d2i { double d; int i[2]; }; |
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127 union d2i u; |
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128 u.d = s; |
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129 int i0 = force_to_fit_range (u.i[0], 1, 2147483563); |
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130 int i1 = force_to_fit_range (u.i[1], 1, 2147483399); |
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131 F77_FUNC (setsd, SETSD) (i0, i1); |
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132 } |
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133 |
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134 std::string |
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135 octave_rand::distribution (void) |
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136 { |
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137 maybe_initialize (); |
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138 |
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139 if (current_distribution == uniform_dist) |
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140 return "uniform"; |
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141 else if (current_distribution == normal_dist) |
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142 return "normal"; |
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143 else |
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144 { |
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145 abort (); |
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146 return ""; |
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147 } |
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148 } |
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149 |
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150 void |
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151 octave_rand::distribution (const std::string& d) |
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152 { |
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153 if (d == "uniform") |
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154 octave_rand::uniform_distribution (); |
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155 else if (d == "normal") |
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156 octave_rand::normal_distribution (); |
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157 else |
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158 (*current_liboctave_error_handler) ("rand: invalid distribution"); |
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159 } |
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160 |
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161 void |
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162 octave_rand::uniform_distribution (void) |
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163 { |
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164 maybe_initialize (); |
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165 |
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166 current_distribution = uniform_dist; |
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167 |
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168 F77_FUNC (setcgn, SETCGN) (uniform_dist); |
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169 } |
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170 |
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171 void |
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172 octave_rand::normal_distribution (void) |
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173 { |
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174 maybe_initialize (); |
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175 |
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176 current_distribution = normal_dist; |
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177 |
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178 F77_FUNC (setcgn, SETCGN) (normal_dist); |
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179 } |
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180 |
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181 double |
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182 octave_rand::scalar (void) |
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183 { |
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184 maybe_initialize (); |
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185 |
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186 double retval = 0.0; |
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187 |
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188 switch (current_distribution) |
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189 { |
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190 case uniform_dist: |
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191 F77_FUNC (dgenunf, DGENUNF) (0.0, 1.0, retval); |
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192 break; |
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193 |
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194 case normal_dist: |
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195 F77_FUNC (dgennor, DGENNOR) (0.0, 1.0, retval); |
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196 break; |
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197 |
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198 default: |
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199 abort (); |
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200 break; |
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201 } |
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202 |
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203 return retval; |
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204 } |
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205 |
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206 #define MAKE_RAND_MAT(mat, nr, nc, f, F) \ |
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207 do \ |
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208 { \ |
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209 double val; \ |
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210 for (volatile int j = 0; j < nc; j++) \ |
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211 for (volatile int i = 0; i < nr; i++) \ |
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212 { \ |
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213 OCTAVE_QUIT; \ |
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214 F77_FUNC (f, F) (0.0, 1.0, val); \ |
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215 mat(i,j) = val; \ |
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216 } \ |
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217 } \ |
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218 while (0) |
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219 |
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220 Matrix |
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221 octave_rand::matrix (int n, int m) |
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222 { |
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223 maybe_initialize (); |
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224 |
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225 Matrix retval; |
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226 |
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227 if (n >= 0 && m >= 0) |
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228 { |
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229 retval.resize (n, m); |
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230 |
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231 if (n > 0 && m > 0) |
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232 { |
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233 switch (current_distribution) |
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234 { |
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235 case uniform_dist: |
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236 MAKE_RAND_MAT (retval, n, m, dgenunf, DGENUNF); |
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237 break; |
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238 |
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239 case normal_dist: |
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240 MAKE_RAND_MAT (retval, n, m, dgennor, DGENNOR); |
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241 break; |
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242 |
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243 default: |
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244 abort (); |
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245 break; |
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246 } |
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247 } |
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248 } |
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249 else |
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250 (*current_liboctave_error_handler) ("rand: invalid negative argument"); |
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251 |
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252 return retval; |
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253 } |
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254 |
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255 #define MAKE_RAND_ARRAY(array, n, f, F) \ |
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256 do \ |
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257 { \ |
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258 double val; \ |
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259 for (volatile int i = 0; i < n; i++) \ |
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260 { \ |
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261 OCTAVE_QUIT; \ |
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262 F77_FUNC (f, F) (0.0, 1.0, val); \ |
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263 array(i) = val; \ |
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264 } \ |
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265 } \ |
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266 while (0) |
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267 |
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268 Array<double> |
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269 octave_rand::vector (int n) |
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270 { |
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271 maybe_initialize (); |
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272 |
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273 Array<double> retval; |
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274 |
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275 if (n > 0) |
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276 { |
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277 retval.resize (n); |
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278 |
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279 switch (current_distribution) |
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280 { |
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281 case uniform_dist: |
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282 MAKE_RAND_ARRAY (retval, n, dgenunf, DGENUNF); |
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283 break; |
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284 |
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285 case normal_dist: |
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286 MAKE_RAND_ARRAY (retval, n, dgennor, DGENNOR); |
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287 break; |
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288 |
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289 default: |
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290 abort (); |
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291 break; |
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292 } |
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293 } |
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294 else if (n < 0) |
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295 (*current_liboctave_error_handler) ("rand: invalid negative argument"); |
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296 |
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297 return retval; |
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298 } |
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299 |
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300 /* |
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301 ;;; Local Variables: *** |
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302 ;;; mode: C++ *** |
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303 ;;; End: *** |
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304 */ |
