Mercurial > octave-nkf
annotate scripts/ode/private/fuzzy_compare.m @ 20584:eb9e2d187ed2
maint: Use Octave coding conventions in scripts/ode/private dir.
* AbsRel_Norm.m, fuzzy_compare.m, hermite_quartic_interpolation.m,
integrate_adaptive.m, integrate_const.m, integrate_n_steps.m, kahan.m,
ode_struct_value_check.m, odepkg_event_handle.m, odepkg_structure_check.m,
runge_kutta_45_dorpri.m, starting_stepsize.m:
Wrap long lines to < 80 chars.
Use double quotes rather than single quotes where possible.
Use ';' at end of keywords "return;" and "break;"
Use '##" for stand-alone comments and '#' for end-of-line comments.
Use two spaces after period before starting new sentence.
Use '!' instead of '~' for logical negation.
Use specific form of end (endif, endfor, etc.).
Don't use line continuation marker '...' unless necessary.
author | Rik <rik@octave.org> |
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date | Sun, 04 Oct 2015 22:18:54 -0700 |
parents | 25623ef2ff4f |
children | b7ac1e94266e |
rev | line source |
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1 ## Copyright (C) 2013, Roberto Porcu' <roberto.porcu@polimi.it> |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 3 of the License, or (at |
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8 ## your option) any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Function File} {@var{res} =} fuzzy_compare (@var{"string1"}, @var{string_set}) |
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21 ## @deftypefnx {Function File} {@var{res} =} fuzzy_compare (@var{"string1"}, @var{string_set}, @var{correctness}) |
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22 ## |
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23 ## Compare a string with a set of strings and returns the positions in the |
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24 ## set of strings at which there are the fields that best fit the one we are |
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25 ## comparing. |
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26 ## |
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27 ## The distance used to compare the words is the Levenshtein distance. |
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28 ## For more details see |
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29 ## @url{http://en.wikipedia.org/wiki/Levenshtein_distance}. |
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30 ## |
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31 ## This function must be called with one output argument @var{res} which |
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32 ## contains the positions of the elements in @var{string_set} which best fit |
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33 ## the given word. The tolerance that is used to determine if a field of the |
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34 ## list fits or not the given word is a function of the length of the word |
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35 ## and of the minimum distance of the word from all the elements of the list. |
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36 ## The more the length, the more the tolerance. The less the minimum, the |
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37 ## less the tolerance but if the minimum is close to the length of the word, |
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38 ## the tolerance must be small because it means that no field in the list is |
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39 ## really fitting the given word. So that the function is: |
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40 ## |
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41 ## @ifhtml |
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42 ## @example |
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43 ## @math{tolerance = 2 * (length-minimum) * minimum / length} |
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44 ## @end example |
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45 ## @end ifhtml |
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46 ## @ifnothtml |
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47 ## @math{tolerance = 2 * (length-minimum) * minimum / length}. |
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48 ## @end ifnothtml |
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49 ## |
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50 ## The first input argument must be a string containing the word to compare. |
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51 ## |
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52 ## The second input argument must be a vector of strings or a cell_array of |
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53 ## strings and should contain the fields to use for the comparison. |
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54 ## |
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55 ## The third input argument is optional and represents a fixed tolerance that |
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56 ## will replace the implemented one. |
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57 ## @end deftypefn |
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58 ## |
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59 ## @seealso{odeset, odeget, levenshtein} |
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60 |
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61 function res = fuzzy_compare (string1, string_set, correctness) |
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62 |
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63 ## check on output arguments |
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64 if (nargout > 1) |
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65 error ("OdePkg:InvalidArgument", "too many output arguments"); |
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66 endif |
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67 |
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68 ## check on input arguments |
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69 if (nargin < 2 || nargin > 3) |
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70 error ("OdePkg:InvalidArgument", "wrong input arguments number"); |
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71 endif |
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72 |
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73 if (! ischar (string1) |
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74 || (! iscellstr (string_set) |
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75 && ! ischar (string_set))) |
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76 error ("OdePkg:InvalidArgument", |
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77 "first argument must be a string, second argument ", |
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78 "must be an array of strings or a cell array of strings"); |
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79 endif |
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80 |
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81 if (nargin == 3) |
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82 if ((! isnumeric (correctness) || ! isscalar (correctness)) |
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83 && (! ischar (correctness))) |
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84 error ("OdePkg:InvalidArgument", |
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85 "third input argument must be a positive ", |
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86 "integer or a string"); |
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87 endif |
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88 |
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89 if (isnumeric (correctness) |
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90 && ( correctness < 0 || mod (correctness, 1) != 0)) |
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91 error ("OdePkg:InvalidArgument", |
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92 "third input argument must be a positive integer"); |
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93 endif |
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94 endif |
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95 |
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96 res = []; |
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97 |
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98 m = length (string1); |
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99 fields_nb = rows (string_set); |
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100 |
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101 values = Inf (fields_nb, 1); |
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102 |
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103 string1 = deblank (string1); |
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104 string2 = []; |
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105 |
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106 minimus = inf; |
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107 ## loop on every field of the list |
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108 for i = 1:fields_nb |
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109 if (iscellstr (string_set)) |
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110 string2 = deblank (string_set{i}); |
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111 else |
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112 string2 = deblank (string_set(i,:)); |
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113 endif |
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114 ## compute Levenshtein distance (not case sensitive) |
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115 values(i) = levenshtein (lower (string1), |
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116 lower (string2), |
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117 minimus); |
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118 ## update the upper_bound to speedup the computation |
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119 minimus = min (minimus, values(i)); |
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120 endfor |
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121 |
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122 positions = find (values == minimus); |
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123 |
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124 if (minimus == 0) # exact match |
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125 if (rows (positions) != 1) |
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126 error ("OdePkg:InvalidArgument", |
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127 "there are %d strings perfectly matching '%s'", |
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128 rows (positions), string1); |
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129 endif |
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130 res = positions; |
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131 return; |
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132 endif |
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133 |
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134 ## determine the tolerance with the formula described in the |
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135 ## textinfo section it is a downwards parable with zeros in 0 and m |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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136 ## and with a maximum in m/2 of value m/2 |
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137 tolerance = m * (-(minimus - m) * minimus * (2 / (m*m))); |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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138 |
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139 ## if the degree of correctness is fixed by the user, it will |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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140 ## replace the tolerance |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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141 if (nargin == 3) |
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142 if ((isnumeric (correctness) |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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143 && isscalar (correctness) |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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144 && correctness == 0) |
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145 || (ischar (correctness) |
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146 && strcmp (lower (deblank (correctness)), "exact"))) |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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147 error ("OdePkg:InvalidArgument", |
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148 "no exact matching for string '%s'", string1); |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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149 endif |
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150 if (isnumeric (correctness) && isscalar (correctness)) |
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151 tolerance = correctness; |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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152 endif |
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153 endif |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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154 |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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155 ## returning the positions of the fields whose distance is lower |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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156 ## than the tolerance |
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157 for i = 1:fields_nb |
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158 if (values(i) <= tolerance) |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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159 res = [res; i]; |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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160 endif |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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161 endfor |
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162 |
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Moving ode45, odeset, odeget, and levenshtein from odepkg to core.
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163 endfunction |
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164 |