--- a/scripts/signal/fractdiff.m
+++ b/scripts/signal/fractdiff.m
@@ -1,15 +1,15 @@
 ## Copyright (C) 1995, 1996, 1997  Friedrich Leisch
-## 
+##
 ## 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.
@@ -18,33 +18,33 @@
 ##
 ## Computes the fractional differences (1-L)^d x where L denotes the
 ## lag-operator and d > -1.
-  
+
 ## Author:  FL <Friedrich.Leisch@ci.tuwien.ac.at>
 ## Description:  Compute fractional differences
-    
+
 function retval = fractdiff (x, d)
-    
+
   N = 100;
-  
+
   if !is_vector (x)
     error ("fractdiff:  x must be a vector")
   endif
-  
+
   if !is_scalar (d)
     error ("fractdiff:  d must be a scalar")
   endif
-  
-    
+
+
   if (d >= 1)
     for k = 1 : d
       x = x(2 : length (x)) - x(1 : length (x) - 1);
     endfor
   endif
-  
+
   if (d > -1)
-    
+
     d = rem (d, 1);
-  
+
     if (d != 0)
       n = (0 : N)';
       w = real (gamma (-d+n) ./ gamma (-d) ./ gamma (n+1));
@@ -53,10 +53,10 @@
     else
       retval = x;
     endif
-    
+
   else
     error ("fractdiff:  d must be > -1");
-    
+
   endif
-  
+
 endfunction