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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, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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20 02110-1301, 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 <iostream> |
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29 |
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30 #include "FEGrid.h" |
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31 #include "lo-error.h" |
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32 |
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33 // error handling |
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34 |
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35 void |
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36 FEGrid::error (const char* msg) const |
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37 { |
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38 (*current_liboctave_error_handler) ("fatal FEGrid error: %s", msg); |
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39 } |
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40 |
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41 void |
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42 FEGrid::nel_error (void) const |
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43 { |
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44 error ("number of elements less than 1"); |
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45 } |
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46 |
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47 // Constructors |
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48 |
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49 FEGrid::FEGrid (octave_idx_type nel, double width) |
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50 { |
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51 if (nel < 1) |
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52 { |
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53 nel_error (); |
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54 return; |
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55 } |
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56 |
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57 elem.resize (nel+1); |
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58 |
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59 for (octave_idx_type i = 0; i <= nel; i++) |
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60 elem.elem (i) = i * width; |
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61 } |
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62 |
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63 FEGrid::FEGrid (octave_idx_type nel, double l, double r) |
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64 { |
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65 if (nel < 1) |
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66 { |
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67 nel_error (); |
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68 return; |
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69 } |
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70 |
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71 elem.resize (nel+1); |
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72 |
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73 double width = (r - l) / nel; |
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74 |
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75 for (octave_idx_type i = 0; i <= nel; i++) |
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76 elem.elem (i) = i * width + l; |
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77 |
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78 check_grid (); |
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79 } |
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80 |
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81 octave_idx_type |
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82 FEGrid::element (double x) const |
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83 { |
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84 if (! in_bounds (x)) |
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85 { |
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86 error ("value not within grid boundaries"); |
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87 return -1; |
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88 } |
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89 |
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90 octave_idx_type nel = elem.capacity () - 1; |
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91 for (octave_idx_type i = 1; i <= nel; i++) |
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92 { |
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93 if (x >= elem.elem (i-1) && x <= elem.elem (i)) |
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94 return i; |
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95 } |
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96 return -1; |
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97 |
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98 } |
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99 |
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100 void |
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101 FEGrid::check_grid (void) const |
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102 { |
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103 octave_idx_type nel = elem.capacity () - 1; |
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104 if (nel < 1) |
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105 { |
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106 nel_error (); |
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107 return; |
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108 } |
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109 |
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110 for (octave_idx_type i = 1; i <= nel; i++) |
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111 { |
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112 if (elem.elem (i-1) > elem.elem (i)) |
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113 { |
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114 error ("element boundaries not in ascending order"); |
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115 return; |
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116 } |
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117 |
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118 if (elem.elem (i-1) == elem.elem (i)) |
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119 { |
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120 error ("zero width element"); |
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121 return; |
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122 } |
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123 } |
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124 } |
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125 |
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126 std::ostream& |
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127 operator << (std::ostream& s, const FEGrid& g) |
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128 { |
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129 s << g.element_boundaries (); |
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130 return s; |
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131 } |
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132 |
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133 /* |
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134 ;;; Local Variables: *** |
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135 ;;; mode: C++ *** |
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136 ;;; End: *** |
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137 */ |
