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1 // f-fill.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1994 John W. Eaton |
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5 |
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6 This file is part of Octave. |
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7 |
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8 Octave is free software; you can redistribute it and/or modify it |
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9 under the terms of the GNU General Public License as published by the |
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10 Free Software Foundation; either version 2, or (at your option) any |
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11 later version. |
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12 |
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13 Octave is distributed in the hope that it will be useful, but WITHOUT |
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14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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16 for more details. |
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17 |
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18 You should have received a copy of the GNU General Public License |
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19 along with Octave; see the file COPYING. If not, write to the Free |
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20 Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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21 |
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22 */ |
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23 |
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24 #ifdef HAVE_CONFIG_H |
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25 #include "config.h" |
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26 #endif |
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27 |
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28 #include "tree-const.h" |
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29 #include "user-prefs.h" |
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30 #include "utils.h" |
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31 #include "error.h" |
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32 #include "f-fill.h" |
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33 |
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34 #ifndef MIN |
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35 #define MIN(a,b) ((a) < (b) ? (a) : (b)) |
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36 #endif |
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37 |
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38 static void |
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39 check_dimensions (int& nr, int& nc, const char *warnfor) |
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40 { |
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41 if (nr < 0 || nc < 0) |
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42 { |
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43 if (user_pref.treat_neg_dim_as_zero) |
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44 nr = nc = 0; |
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45 else |
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46 error ("%s: can't create a matrix with negative dimensions", |
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47 warnfor); |
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48 } |
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49 } |
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50 |
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51 static void |
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52 get_dimensions (const tree_constant& a, const char *warn_for, |
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53 int& nr, int& nc) |
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54 { |
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55 tree_constant tmpa = a.make_numeric (); |
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56 |
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57 if (tmpa.is_scalar_type ()) |
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58 { |
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59 double tmp = tmpa.double_value (); |
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60 nr = nc = NINT (tmp); |
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61 } |
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62 else |
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63 { |
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64 nr = tmpa.rows (); |
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65 nc = tmpa.columns (); |
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66 |
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67 if ((nr == 1 && nc == 2) || (nr == 2 && nc == 1)) |
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68 { |
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69 ColumnVector v = tmpa.to_vector (); |
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70 |
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71 nr = NINT (v.elem (0)); |
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72 nc = NINT (v.elem (1)); |
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73 } |
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74 else |
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75 warning ("%s (A): use %s (size (A)) instead", warn_for, warn_for); |
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76 } |
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77 |
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78 check_dimensions (nr, nc, warn_for); // May set error_state. |
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79 } |
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80 |
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81 static void |
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82 get_dimensions (const tree_constant& a, const tree_constant& b, |
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83 const char *warn_for, int& nr, int& nc) |
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84 { |
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85 tree_constant tmpa = a.make_numeric (); |
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86 tree_constant tmpb = b.make_numeric (); |
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87 |
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88 if (tmpa.is_scalar_type () && tmpb.is_scalar_type ()) |
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89 { |
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90 nr = NINT (tmpa.double_value ()); |
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91 nc = NINT (tmpb.double_value ()); |
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92 |
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93 check_dimensions (nr, nc, warn_for); // May set error_state. |
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94 } |
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95 else |
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96 error ("%s: expecting two scalar arguments", warn_for); |
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97 } |
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98 |
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99 tree_constant |
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100 fill_matrix (const tree_constant& a, double val, const char *warn_for) |
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101 { |
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102 int nr, nc; |
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103 get_dimensions (a, warn_for, nr, nc); |
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104 |
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105 if (error_state) |
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106 return tree_constant (); |
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107 |
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108 Matrix m (nr, nc, val); |
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109 |
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110 return m; |
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111 } |
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112 |
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113 tree_constant |
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114 fill_matrix (const tree_constant& a, const tree_constant& b, |
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115 double val, const char *warn_for) |
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116 { |
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117 int nr, nc; |
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118 get_dimensions (a, b, warn_for, nr, nc); // May set error_state. |
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119 |
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120 if (error_state) |
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121 return tree_constant (); |
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122 |
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123 Matrix m (nr, nc, val); |
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124 |
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125 return m; |
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126 } |
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127 |
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128 tree_constant |
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129 identity_matrix (const tree_constant& a) |
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130 { |
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131 int nr, nc; |
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132 get_dimensions (a, "eye", nr, nc); // May set error_state. |
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133 |
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134 if (error_state) |
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135 return tree_constant (); |
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136 |
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137 Matrix m (nr, nc, 0.0); |
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138 |
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139 if (nr > 0 && nc > 0) |
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140 { |
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141 int n = MIN (nr, nc); |
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142 for (int i = 0; i < n; i++) |
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143 m.elem (i, i) = 1.0; |
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144 } |
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145 |
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146 return m; |
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147 } |
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148 |
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149 tree_constant |
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150 identity_matrix (const tree_constant& a, const tree_constant& b) |
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151 { |
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152 int nr, nc; |
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153 get_dimensions (a, b, "eye", nr, nc); // May set error_state. |
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154 |
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155 if (error_state) |
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156 return tree_constant (); |
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157 |
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158 Matrix m (nr, nc, 0.0); |
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159 |
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160 if (nr > 0 && nc > 0) |
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161 { |
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162 int n = MIN (nr, nc); |
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163 for (int i = 0; i < n; i++) |
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164 m.elem (i, i) = 1.0; |
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165 } |
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166 |
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167 return m; |
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168 } |
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169 |
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170 /* |
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171 ;;; Local Variables: *** |
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172 ;;; mode: C++ *** |
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173 ;;; page-delimiter: "^/\\*" *** |
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174 ;;; End: *** |
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175 */ |
