--- a/scripts/linear-algebra/duplication_matrix.m
+++ b/scripts/linear-algebra/duplication_matrix.m
@@ -1,20 +1,20 @@
 ## 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. 
-## 
+## 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.
 
-## -*- texinfo -*- 
+## -*- texinfo -*-
 ## @deftypefn {Function File} {} duplication_matrix (@var{n})
 ## Return the duplication matrix
 ## @iftex
@@ -61,7 +61,7 @@
 ## @ifinfo
 ##  @var{A}.
 ## @end ifinfo
-## 
+##
 ## See Magnus and Neudecker (1988), Matrix differential calculus with
 ## applications in statistics and econometrics.
 ## @end deftypefn