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annotate scripts/strings/rindex.m @ 2355:c9f70d39255f

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[project @ 1996-08-20 23:30:54 by jwe]
author jwe
date Tue, 20 Aug 1996 23:32:09 +0000
parents b5568c31ee2c
children 4f40efa995c1
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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 ## usage: rindex (s, t)
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21 ##
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22 ## Returns the position of the last occurence of the string T in the
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23 ## string S or 0 if no occurence is found.
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24 ##
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25 ## NOTE: this function does not work for arrays of strings.
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26
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27 ## Author: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>
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28 ## Adapted-By: jwe
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29
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30 function n = rindex (s, t)
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31
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32 ## This is patterned after the AWK function of the same name.
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33
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34 if (nargin != 2)
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35 usage ("rindex (s, t)");
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36 endif
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37
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38 n = 0;
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39
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40 if (isstr (s) && isstr (t))
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41
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42 l_s = length (s);
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43 l_t = length (t);
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44
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45 if (l_t <= l_s)
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46 tmp = l_s - l_t + 1;
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47 for idx = tmp : -1 : 1
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48 if (strcmp (substr (s, idx, l_t), t))
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49 n = idx;
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50 return;
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51 endif
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52 endfor
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53 endif
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54
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55 else
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56 error ("rindex: expecting string arguments");
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57 endif
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58
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59 endfunction