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1 // FEGrid.cc -*- C++ -*- |
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2 /* |
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3 |
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4 Copyright (C) 1992, 1993, 1994, 1995 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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21 |
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22 */ |
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23 |
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24 #if defined (__GNUG__) |
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25 #pragma implementation |
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26 #endif |
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27 |
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28 #ifdef HAVE_CONFIG_H |
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29 #include <config.h> |
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30 #endif |
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31 |
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32 #include <iostream.h> |
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33 |
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34 #include "FEGrid.h" |
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35 #include "lo-error.h" |
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36 |
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37 // error handling |
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38 |
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39 void |
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40 FEGrid::error (const char* msg) const |
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41 { |
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42 (*current_liboctave_error_handler) ("fatal FEGrid error: %s", msg); |
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43 } |
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44 |
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45 void |
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46 FEGrid::nel_error (void) const |
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47 { |
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48 error ("number of elements less than 1"); |
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49 } |
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50 |
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51 // Constructors |
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52 |
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53 FEGrid::FEGrid (int nel, double width) |
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54 { |
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55 if (nel < 1) |
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56 { |
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57 nel_error (); |
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58 return; |
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59 } |
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60 |
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61 elem.resize (nel+1); |
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62 |
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63 for (int i = 0; i <= nel; i++) |
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64 elem.elem (i) = i * width; |
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65 } |
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66 |
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67 FEGrid::FEGrid (int nel, double left, double right) |
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68 { |
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69 if (nel < 1) |
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70 { |
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71 nel_error (); |
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72 return; |
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73 } |
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74 |
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75 elem.resize (nel+1); |
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76 |
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77 double width = (right - left) / (double) nel; |
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78 |
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79 for (int i = 0; i <= nel; i++) |
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80 elem.elem (i) = i * width + left; |
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81 |
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82 check_grid (); |
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83 } |
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84 |
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85 int |
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86 FEGrid::element (double x) const |
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87 { |
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88 if (! in_bounds (x)) |
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89 { |
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90 error ("value not within grid boundaries"); |
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91 return -1; |
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92 } |
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93 |
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94 int nel = elem.capacity () - 1; |
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95 for (int i = 1; i <= nel; i++) |
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96 { |
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97 if (x >= elem.elem (i-1) && x <= elem.elem (i)) |
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98 return i; |
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99 } |
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100 return -1; |
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101 |
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102 } |
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103 |
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104 void |
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105 FEGrid::check_grid (void) const |
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106 { |
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107 int nel = elem.capacity () - 1; |
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108 if (nel < 1) |
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109 { |
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110 nel_error (); |
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111 return; |
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112 } |
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113 |
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114 for (int i = 1; i <= nel; i++) |
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115 { |
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116 if (elem.elem (i-1) > elem.elem (i)) |
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117 { |
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118 error ("element boundaries not in ascending order"); |
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119 return; |
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120 } |
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121 |
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122 if (elem.elem (i-1) == elem.elem (i)) |
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123 { |
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124 error ("zero width element"); |
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125 return; |
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126 } |
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127 } |
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128 } |
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129 |
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130 ostream& |
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131 operator << (ostream& s, const FEGrid& g) |
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132 { |
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133 s << g.element_boundaries (); |
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134 return s; |
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135 } |
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136 |
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137 /* |
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138 ;;; Local Variables: *** |
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139 ;;; mode: C++ *** |
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140 ;;; page-delimiter: "^/\\*" *** |
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141 ;;; End: *** |
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142 */ |
