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1 ## Copyright (C) 1996 Kurt Hornik |
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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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
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18 ## 02111-1307, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} index (@var{s}, @var{t}) |
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22 ## Return the position of the first occurrence of the string @var{t} in the |
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23 ## string @var{s}, or 0 if no occurrence is found. For example, |
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24 ## |
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25 ## @example |
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26 ## index ("Teststring", "t") |
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27 ## @result{} 4 |
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28 ## @end example |
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29 ## |
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30 ## @strong{Note:} This function does not work for arrays of strings. |
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31 ## @end deftypefn |
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32 |
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33 ## Author: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at> |
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34 ## Adapted-By: jwe |
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35 |
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36 function n = index (s, t) |
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37 |
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38 ## This is patterned after the AWK function of the same name. |
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39 |
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40 if (nargin != 2) |
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41 usage ("index (s, t)"); |
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42 endif |
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43 |
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44 n = 0; |
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45 |
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46 if (isstr (s) && isstr (t)) |
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47 |
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48 [nr_s, l_s] = size (s); |
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49 [nr_t, l_t] = size (t); |
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50 |
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51 if (nr_s == 0 || nr_t == 0) |
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52 return; |
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53 endif |
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54 |
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55 if (nr_s != 1 || nr_t != 1) |
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56 error ("index: arguments cannot be string arrays"); |
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57 endif |
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58 |
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59 if (l_t <= l_s) |
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60 tmp = l_s - l_t + 1; |
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61 for idx = 1 : tmp |
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62 if (strcmp (substr (s, idx, l_t), t)) |
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63 n = idx; |
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64 return; |
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65 endif |
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66 endfor |
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67 endif |
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68 |
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69 else |
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70 error ("index: expecting string arguments"); |
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71 endif |
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72 |
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73 endfunction |
