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comparison scripts/strings/rindex.m @ 2271:707b9396ad2c

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[project @ 1996-05-24 02:22:01 by jwe] Initial revision
author jwe
date Fri, 24 May 1996 02:22:01 +0000
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children 6dedd4e0a82f
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2270:cfcf8ff7d2dd 2271:707b9396ad2c
1 # Copyright (C) 1996 John W. Eaton
2 #
3 # This file is part of Octave.
4 #
5 # Octave is free software; you can redistribute it and/or modify it
6 # under the terms of the GNU General Public License as published by the
7 # Free Software Foundation; either version 2, or (at your option) any
8 # later version.
9 #
10 # Octave is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # for more details.
14 #
15 # You should have received a copy of the GNU General Public License
16 # along with Octave; see the file COPYING. If not, write to the Free
17 # Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18
19 function n = rindex (s, t)
20
21 # usage: rindex (s, t)
22 #
23 # Returns the position of the last occurence of the string T in the
24 # string S or 0 if no occurence is found.
25 #
26 # NOTE: this function does not work for arrays of strings.
27
28 # This is patterned after the AWK function of the same name.
29
30 # Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>.
31
32 if (nargin != 2)
33 usage ("rindex (s, t)");
34 endif
35
36 n = 0;
37
38 if (isstr (s) && isstr (t))
39
40 l_s = length (s);
41 l_t = length (t);
42
43 if (l_t <= l_s)
44 tmp = l_s - l_t + 1;
45 for idx = tmp : -1 : 1
46 if (strcmp (substr (s, idx, l_t), t))
47 n = idx;
48 return;
49 endif
50 endfor
51 endif
52
53 else
54 error ("rindex: expecting string arguments");
55 endif
56
57 endfunction