--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/FIXES/index.m	Wed Oct 10 19:54:49 2001 +0000
@@ -0,0 +1,102 @@
+## Copyright (C) 1996 Kurt Hornik
+##
+## 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.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {} index (@var{s}, @var{t})
+## Return the position of the first occurrence of the string @var{t} in the
+## string @var{s}, or 0 if no occurrence is found.  For example,
+##
+## @example
+## index ("Teststring", "t")
+##      @result{} 4
+## @end example
+##
+## @strong{Note:}  This function does not work for arrays of strings.
+## @end deftypefn
+
+## Author: Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>
+## Adapted-By: jwe
+## Paul Kienzle <pkienzle@kienzle.powernet.co.uk>
+##    vectorize for speed
+
+function n = index (s, t)
+
+  ## This is patterned after the AWK function of the same name.
+
+  if (nargin != 2)
+    usage ("index (s, t)");
+  endif
+  
+  if (!isstr (s) || !isstr (t) || all (size (s) > 1) || all (size (t) > 1) )
+    error ("index: expecting string arguments");
+  endif
+
+  l_s = length (s);
+  l_t = length (t);
+  
+  if ( l_s == 0 || l_s < l_t )
+    ## zero length source, or target longer than source
+    v = [];
+    
+  elseif ( l_t == 0 )
+    ## zero length target: return first
+    v = 1;
+    
+  elseif ( l_t == 1 )
+    ## length one target: simple find
+    v = find (s==t);
+    
+  elseif ( l_t == 2 )
+    ## length two target: find first at i and second at i+1
+    v = find (s (1 : l_s-1) == t (1) & s (2 : l_s) == t (2));
+    
+  else
+    ## length three or more: match the first three by find then go through
+    ## the much smaller list to determine which of them are real matches
+    limit = l_s - l_t + 1;
+    v = find (s (1 : limit) == t(1) & s (2 : limit+1) == t (2)
+	      & s (3 : limit+2) == t(3) );
+  endif
+
+  if (l_t > 3)
+    
+    ## force strings to be both row vectors or both column vectors
+    if (all (size (s) != size (t)))
+      t = t.';
+    endif
+    
+    ## search index vector for a match
+    ind = 0 : l_t - 1;
+    n = 0; # return 0 if loop terminates without finding any match
+    for idx = 1:length(v)
+      if (s (v(idx) + ind) == t)
+	n = v(idx);
+	break;
+      endif
+    endfor
+
+  elseif (length(v) > 0)
+    n = v(1);
+
+  else
+    n = 0;
+
+  endif
+
+endfunction