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1 CLASS = "DASSL" |
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2 |
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3 INCLUDE = "DAE.h" |
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4 |
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5 OPTION |
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6 NAME = "absolute tolerance" |
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7 DOC_ITEM |
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8 Absolute tolerance. May be either vector or scalar. If a vector, it |
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9 must match the dimension of the state vector, and the relative |
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10 tolerance must also be a vector of the same length. |
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11 END_DOC_ITEM |
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12 TYPE = "Array<double>" |
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13 SET_ARG_TYPE = "const $TYPE&" |
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14 INIT_BODY |
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15 $OPTVAR.resize (1); |
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16 $OPTVAR(0) = ::sqrt (DBL_EPSILON); |
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17 END_INIT_BODY |
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18 SET_CODE |
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19 void set_$OPT (double val) |
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20 { |
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21 $OPTVAR.resize (1); |
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22 $OPTVAR(0) = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); |
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23 reset = true; |
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24 } |
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25 |
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26 void set_$OPT (const $TYPE& val) |
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27 { $OPTVAR = val; reset = true; } |
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28 END_SET_CODE |
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29 END_OPTION |
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30 |
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31 OPTION |
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32 NAME = "relative tolerance" |
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33 DOC_ITEM |
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34 Relative tolerance. May be either vector or scalar. If a vector, it |
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35 must match the dimension of the state vector, and the absolute |
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36 tolerance must also be a vector of the same length. |
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37 |
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38 The local error test applied at each integration step is |
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39 |
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40 @example |
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41 abs (local error in x(i)) |
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42 <= rtol(i) * abs (Y(i)) + atol(i) |
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43 @end example |
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44 END_DOC_ITEM |
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45 TYPE = "Array<double>" |
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46 SET_ARG_TYPE = "const $TYPE&" |
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47 INIT_BODY |
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48 $OPTVAR.resize (1); |
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49 $OPTVAR(0) = ::sqrt (DBL_EPSILON); |
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50 END_INIT_BODY |
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51 SET_CODE |
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52 void set_$OPT (double val) |
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53 { |
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54 $OPTVAR.resize (1); |
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55 $OPTVAR(0) = (val > 0.0) ? val : ::sqrt (DBL_EPSILON); |
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56 reset = true; |
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57 } |
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58 |
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59 void set_$OPT (const $TYPE& val) |
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60 { $OPTVAR = val; reset = true; } |
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61 END_SET_CODE |
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62 END_OPTION |
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63 |
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64 OPTION |
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65 NAME = "compute consistent initial condition" |
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66 DOC_ITEM |
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67 If nonzero, @code{dassl} will attempt to compute a consistent set of intial |
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68 conditions. This is generally not reliable, so it is best to provide |
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69 a consistent set and leave this option set to zero. |
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70 END_DOC_ITEM |
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71 TYPE = "int" |
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72 INIT_VALUE = "0" |
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73 SET_EXPR = "val" |
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74 END_OPTION |
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75 |
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76 OPTION |
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77 NAME = "enforce nonnegativity constraints" |
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78 DOC_ITEM |
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79 If you know that the solutions to your equations will always be |
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80 nonnegative, it may help to set this parameter to a nonzero |
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81 value. However, it is probably best to try leaving this option set to |
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82 zero first, and only setting it to a nonzero value if that doesn't |
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83 work very well. |
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84 END_DOC_ITEM |
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85 TYPE = "int" |
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86 INIT_VALUE = "0" |
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87 SET_EXPR = "val" |
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88 END_OPTION |
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89 |
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90 OPTION |
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91 NAME = "initial step size" |
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92 DOC_ITEM |
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93 Differential-algebraic problems may occaisionally suffer from severe |
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94 scaling difficulties on the first step. If you know a great deal |
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95 about the scaling of your problem, you can help to alleviate this |
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96 problem by specifying an initial stepsize. |
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97 END_DOC_ITEM |
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98 TYPE = "double" |
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99 INIT_VALUE = "-1.0" |
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100 SET_EXPR = "(val >= 0.0) ? val : -1.0" |
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101 END_OPTION |
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102 |
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103 OPTION |
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104 NAME = "maximum order" |
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105 DOC_ITEM |
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106 Restrict the maximum order of the solution method. This option must |
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107 be between 1 and 5, inclusive. |
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108 END_DOC_ITEM |
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109 TYPE = "int" |
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110 INIT_VALUE = "-1" |
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111 SET_EXPR = "val" |
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112 END_OPTION |
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113 |
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114 OPTION |
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115 NAME = "maximum step size" |
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116 DOC_ITEM |
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117 Setting the maximum stepsize will avoid passing over very large |
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118 regions (default is not specified). |
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119 END_DOC_ITEM |
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120 TYPE = "double" |
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121 INIT_VALUE = "-1.0" |
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122 SET_EXPR = "(val >= 0.0) ? val : -1.0" |
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123 END_OPTION |
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124 |
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125 OPTION |
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126 NAME = "step limit" |
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127 DOC_ITEM |
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128 Maximum number of integration steps to attempt on a single call to the |
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129 underlying Fortran code. |
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130 END_DOC_ITEM |
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131 TYPE = "int" |
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132 INIT_VALUE = "-1" |
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133 SET_EXPR = "(val >= 0) ? val : -1" |
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134 END_OPTION |
