--- a/scripts/signal/fftshift.m
+++ b/scripts/signal/fftshift.m
@@ -18,22 +18,22 @@
 ## <http://www.gnu.org/licenses/>.
 
 ## -*- texinfo -*-
-## @deftypefn  {Function File} {} fftshift (@var{v})
-## @deftypefnx {Function File} {} fftshift (@var{v}, @var{dim})
-## Perform a shift of the vector @var{v}, for use with the @code{fft}
+## @deftypefn  {Function File} {} fftshift (@var{x})
+## @deftypefnx {Function File} {} fftshift (@var{x}, @var{dim})
+## Perform a shift of the vector @var{x}, for use with the @code{fft}
 ## and @code{ifft} functions, in order the move the frequency 0 to the
 ## center of the vector or matrix.
 ##
-## If @var{v} is a vector of @math{N} elements corresponding to @math{N}
+## If @var{x} is a vector of @math{N} elements corresponding to @math{N}
 ## time samples spaced of @math{Dt} each, then @code{fftshift (fft
-## (@var{v}))} corresponds to frequencies
+## (@var{x}))} corresponds to frequencies
 ##
 ## @example
 ## f = ((1:N) - ceil(N/2)) / N / Dt
 ## @end example
 ##
-## If @var{v} is a matrix, the same holds for rows and columns.  If 
-## @var{v} is an array, then the same holds along each dimension.
+## If @var{x} is a matrix, the same holds for rows and columns.  If 
+## @var{x} is an array, then the same holds along each dimension.
 ##
 ## The optional @var{dim} argument can be used to limit the dimension
 ## along which the permutation occurs.
@@ -43,7 +43,7 @@
 ## Created: July 1997
 ## Adapted-By: jwe
 
-function retval = fftshift (V, dim)
+function retval = fftshift (x, dim)
 
   retval = 0;
 
@@ -55,29 +55,29 @@
     if (!isscalar (dim))
       error ("fftshift: dimension must be an integer scalar");
     endif
-    nd = ndims (V);
-    sz = size (V);
+    nd = ndims (x);
+    sz = size (x);
     sz2 = ceil (sz(dim) / 2);
     idx = cell ();
     for i = 1:nd
       idx{i} = 1:sz(i);
     endfor
     idx{dim} = [sz2+1:sz(dim), 1:sz2];
-    retval = V (idx{:});
+    retval = x(idx{:});
   else
-    if (isvector (V))
-      x = length (V);
+    if (isvector (x))
+      x = length (x);
       xx = ceil (x/2);
-      retval = V([xx+1:x, 1:xx]);
-    elseif (ismatrix (V))
-      nd = ndims (V);
-      sz = size (V);
+      retval = x([xx+1:x, 1:xx]);
+    elseif (ismatrix (x))
+      nd = ndims (x);
+      sz = size (x);
       sz2 = ceil (sz ./ 2);
       idx = cell ();
       for i = 1:nd
         idx{i} = [sz2(i)+1:sz(i), 1:sz2(i)];
       endfor
-      retval = V (idx{:});
+      retval = x(idx{:});
     else
       error ("fftshift: expecting vector or matrix argument");
     endif