--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/scripts/strings/substr.m	Fri May 24 02:10:11 1996 +0000
@@ -0,0 +1,52 @@
+# 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 t = substr (s, beg, len)
+
+# usage:  substr (s, beg, len)
+#
+# Returns the substring of S of length LEN starting at index BEG.
+# If LEN is missing, the substring extends to the end of S.
+
+# Original version by Kurt Hornik <Kurt.Hornik@ci.tuwien.ac.at>.
+
+  if (nargin < 2 || nargin > 3)
+    usage ("substr (s, beg, len)");
+  endif
+
+  if (isstr (s))
+    nc = columns (s);
+    if (beg > 0 && beg <= nc)
+      if (nargin == 2)
+	eos = nc;
+      else
+	eos = beg + len - 1;
+      endif
+      if (eos <= nc)
+	t = s (:, beg:eos);
+      else
+	error ("substr: length = %d out of range", len);
+      endif
+    else
+      error ("substr: beginning index = %d out of range", beg);
+    endif
+  else
+    error ("substr: expecting string argument");
+  endif
+  
+endfunction