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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 (octave_base_de_h) |
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24 #define octave_base_de_h 1 |
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25 |
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26 #include "dColVector.h" |
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27 #include "dMatrix.h" |
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28 |
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29 class |
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30 base_diff_eqn |
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31 { |
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32 public: |
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33 |
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34 base_diff_eqn (void) : x (), t (0.0) { } |
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35 |
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36 base_diff_eqn (const ColumnVector& xx, double tt) : x (xx), t (tt) { } |
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37 |
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38 base_diff_eqn (const base_diff_eqn& a) : x (a.x), t (a.t) { } |
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39 |
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40 virtual ~base_diff_eqn (void) { } |
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41 |
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42 base_diff_eqn& operator = (const base_diff_eqn& a) |
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43 { |
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44 if (this != &a) |
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45 { |
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46 x = a.x; |
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47 t = a.t; |
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48 } |
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49 return *this; |
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50 } |
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51 |
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52 // Derived classes must provide functions to actually do the |
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53 // integration. |
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54 |
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55 // Return the vector of states at output time t. |
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56 virtual ColumnVector do_integrate (double tt) = 0; |
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57 |
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58 // Return a matrix of states at each output time specified by t. |
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59 // The rows of the result matrix should each correspond to a new |
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60 // output time. |
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61 virtual Matrix do_integrate (const ColumnVector& tt) = 0; |
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62 |
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63 virtual Matrix do_integrate (const ColumnVector& tt, |
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64 const ColumnVector& ttcrit) = 0; |
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65 |
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66 // There must also be a way for us to force the integration to |
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67 // restart. |
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68 virtual void force_restart (void) = 0; |
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69 |
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70 // Lots of ways to call the single function and optionally set and |
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71 // get additional information. |
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72 |
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73 // Integrate to t from current point. |
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74 virtual ColumnVector integrate (double tt) |
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75 { return do_integrate (tt); } |
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76 |
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77 // Set new x0, t0 and integrate to t. |
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78 virtual ColumnVector integrate (const ColumnVector& x0, double t0, double tt) |
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79 { |
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80 initialize (x0, t0); |
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81 return do_integrate (tt); |
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82 } |
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83 |
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84 // Integrate from current point and return output at all points |
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85 // specified by t. |
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86 virtual Matrix integrate (const ColumnVector& tt) |
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87 { return do_integrate (tt); } |
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88 |
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89 // Set new x0, t0 and integrate to return output at all points |
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90 // specified by t. |
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91 virtual Matrix integrate (const ColumnVector& x0, double t0, |
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92 const ColumnVector& tt) |
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93 { |
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94 initialize (x0, t0); |
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95 return do_integrate (tt); |
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96 } |
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97 |
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98 // Integrate from current point and return output at all points |
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99 // specified by t. |
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100 virtual Matrix integrate (const ColumnVector& tt, |
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101 const ColumnVector& ttcrit) |
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102 { return do_integrate (tt, ttcrit); } |
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103 |
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104 // Set new x0, t0 and integrate to return output at all points |
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105 // specified by t. |
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106 virtual Matrix integrate (const ColumnVector& x0, double t0, |
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107 const ColumnVector& tt, |
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108 const ColumnVector& ttcrit) |
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109 { |
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110 initialize (x0, t0); |
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111 return do_integrate (tt, ttcrit); |
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112 } |
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113 |
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114 virtual void initialize (const ColumnVector& x0, double t0) |
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115 { |
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116 x = x0; |
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117 t = t0; |
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118 force_restart (); |
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119 } |
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120 |
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121 int size (void) const { return x.capacity (); } |
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122 |
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123 ColumnVector state (void) const { return x; } |
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124 |
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125 double time (void) const { return t; } |
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126 |
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127 protected: |
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128 |
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129 ColumnVector x; |
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130 double t; |
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131 }; |
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132 |
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133 #endif |
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134 |
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135 /* |
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136 ;;; Local Variables: *** |
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137 ;;; mode: C++ *** |
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138 ;;; End: *** |
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139 */ |
