Mercurial > hg > octave-avbm
changeset 2272:e97fba45f0a3
[project @ 1996-05-24 02:40:06 by jwe]
Initial revision
author | jwe |
---|---|
date | Fri, 24 May 1996 02:40:06 +0000 |
parents | 707b9396ad2c |
children | 5bc8dd06898d |
files | scripts/strings/findstr.m |
diffstat | 1 files changed, 66 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
new file mode 100644 --- /dev/null +++ b/scripts/strings/findstr.m @@ -0,0 +1,66 @@ +# Copyright (C) 1996 John W. Eaton +# +# This file is part of Octave. +# +# Octave is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2, or (at your option) any +# later version. +# +# Octave is distributed in the hope that it will be useful, but WITHOUT +# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +# for more details. +# +# You should have received a copy of the GNU General Public License +# along with Octave; see the file COPYING. If not, write to the Free +# Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +function v = findstr (s, t) + +# usage: findstr (s, t) +# +# Returns the vector of all positions in the longer of the two strings +# S and T where an occurence of the shorter of the two starts. + +# Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>. + + if (nargin != 2) + usage ("findstr (s, t)"); + endif + + if (isstr (s) && isstr (t)) + + # Make S be the longer string. + + if (length (s) < length (t)) + tmp = s; + s = t; + t = tmp; + endif + + s = toascii (s); + t = toascii (t); + + ind = 1 : length (t); + limit = length (s) - length (t) + 1; + v = zeros (1, limit); + i = 0; + + for k = 1 : limit + if (s (ind + k - 1) == t) + v (++i) = k; + endif + endfor + + if (i > 0) + v = v (1:i); + else + v = []; + endif + + else + error ("findstr: both arguments must be strings"); + endif + +endfunction