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+++ b/scripts/general/shift.m
@@ -0,0 +1,60 @@
+## Copyright (C) 1995, 1996  Kurt Hornik
+## 
+## This program 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.
+## 
+## This program 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 this file.  If not, write to the Free Software Foundation,
+## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+## usage: y = shift (x, b)
+##
+## If x is a vector, perform a circular shift of length b of the
+## elements of x.
+##
+## If x is a matrix, do the same for each column of x.
+
+## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
+## Created: 14 September 1994
+## Adapted-By: jwe
+
+function y = shift (x, b)
+  
+  if (nargin != 2)
+    error ("usage: shift (X, b)");
+  endif
+
+  [nr nc] = size (x);
+  
+  if (nr == 0 || nc == 0)
+    error ("shift: x must not be empty");
+  elseif (nr == 1)
+    x = x.';
+    nr = nc;
+    nc = 0;
+  endif
+
+  if (! (is_scalar (b) && b == round (b)))
+    error ("shift: b must be an integer");
+  endif
+
+  if (b >= 0)
+    b = rem (b, nr);
+    y = [x (nr - b + 1 : nr, :); x (1 : nr - b, :)];
+  elseif (b < 0)
+    b = rem (abs (b), nr);
+    y = [x (b + 1 : nr, :); x (1 : b, :)];
+  endif
+
+  if (nc == 0)
+    y = reshape (y, 1, nr);
+  endif
+
+endfunction