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1 /* |
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2 |
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3 Copyright (C) 1996, 1997 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 #if defined (__GNUG__) && defined (USE_PRAGMA_INTERFACE_IMPLEMENTATION) |
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24 #pragma implementation |
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25 #endif |
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26 |
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27 #ifdef HAVE_CONFIG_H |
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28 #include <config.h> |
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29 #endif |
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30 |
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31 #include <iostream> |
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32 |
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33 #include "FEGrid.h" |
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34 #include "lo-error.h" |
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35 |
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36 // error handling |
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37 |
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38 void |
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39 FEGrid::error (const char* msg) const |
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40 { |
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41 (*current_liboctave_error_handler) ("fatal FEGrid error: %s", msg); |
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42 } |
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43 |
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44 void |
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45 FEGrid::nel_error (void) const |
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46 { |
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47 error ("number of elements less than 1"); |
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48 } |
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49 |
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50 // Constructors |
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51 |
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52 FEGrid::FEGrid (int nel, double width) |
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53 { |
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54 if (nel < 1) |
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55 { |
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56 nel_error (); |
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57 return; |
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58 } |
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59 |
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60 elem.resize (nel+1); |
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61 |
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62 for (int i = 0; i <= nel; i++) |
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63 elem.elem (i) = i * width; |
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64 } |
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65 |
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66 FEGrid::FEGrid (int nel, double l, double r) |
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67 { |
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68 if (nel < 1) |
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69 { |
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70 nel_error (); |
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71 return; |
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72 } |
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73 |
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74 elem.resize (nel+1); |
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75 |
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76 double width = (r - l) / nel; |
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77 |
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78 for (int i = 0; i <= nel; i++) |
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79 elem.elem (i) = i * width + l; |
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80 |
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81 check_grid (); |
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82 } |
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83 |
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84 int |
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85 FEGrid::element (double x) const |
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86 { |
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87 if (! in_bounds (x)) |
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88 { |
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89 error ("value not within grid boundaries"); |
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90 return -1; |
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91 } |
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92 |
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93 int nel = elem.capacity () - 1; |
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94 for (int i = 1; i <= nel; i++) |
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95 { |
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96 if (x >= elem.elem (i-1) && x <= elem.elem (i)) |
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97 return i; |
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98 } |
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99 return -1; |
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100 |
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101 } |
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102 |
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103 void |
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104 FEGrid::check_grid (void) const |
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105 { |
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106 int nel = elem.capacity () - 1; |
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107 if (nel < 1) |
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108 { |
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109 nel_error (); |
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110 return; |
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111 } |
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112 |
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113 for (int i = 1; i <= nel; i++) |
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114 { |
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115 if (elem.elem (i-1) > elem.elem (i)) |
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116 { |
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117 error ("element boundaries not in ascending order"); |
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118 return; |
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119 } |
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120 |
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121 if (elem.elem (i-1) == elem.elem (i)) |
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122 { |
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123 error ("zero width element"); |
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124 return; |
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125 } |
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126 } |
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127 } |
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128 |
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129 std::ostream& |
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130 operator << (std::ostream& s, const FEGrid& g) |
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131 { |
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132 s << g.element_boundaries (); |
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133 return s; |
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134 } |
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135 |
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136 /* |
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137 ;;; Local Variables: *** |
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138 ;;; mode: C++ *** |
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139 ;;; End: *** |
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140 */ |
