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comparison scripts/strings/substr.m @ 2270:cfcf8ff7d2dd

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[project @ 1996-05-24 02:10:11 by jwe] Initial revision
author jwe
date Fri, 24 May 1996 02:10:11 +0000
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2269:517a43164a60 2270:cfcf8ff7d2dd
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 t = substr (s, beg, len)
20
21 # usage: substr (s, beg, len)
22 #
23 # Returns the substring of S of length LEN starting at index BEG.
24 # If LEN is missing, the substring extends to the end of S.
25
26 # Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>.
27
28 if (nargin < 2 || nargin > 3)
29 usage ("substr (s, beg, len)");
30 endif
31
32 if (isstr (s))
33 nc = columns (s);
34 if (beg > 0 && beg <= nc)
35 if (nargin == 2)
36 eos = nc;
37 else
38 eos = beg + len - 1;
39 endif
40 if (eos <= nc)
41 t = s (:, beg:eos);
42 else
43 error ("substr: length = %d out of range", len);
44 endif
45 else
46 error ("substr: beginning index = %d out of range", beg);
47 endif
48 else
49 error ("substr: expecting string argument");
50 endif
51
52 endfunction