You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wmtsa_isscalar.m
    path of file: ./repos/bspm/thirdparty/brainwavelet_v1.1_fMRI_OSX/third_party/wmtsa/utils
    
    the code of the file until where you have to start completion: function [tf] = wmtsa_isscalar(x)
% wmtsa_isscalar -- Determine if item is a point.
%
%****f* wmtsa.utils/wmtsa_isscalar
%
% NAME
%   wmtsa_isscalar -- Determine if item is a scalar.
%
% USAGE
%   [tf] = isscalar(x)
%
% INPUTS
%   * x          -- item to check (object).
%
% OUTPUTS
%   * tf          -- flag indicating whether item is a point (numeric Boolean).
%
% DESCRIPTION
%   In MATLAB, points, vectors and matrices all have a dimensionality of two,
%   (i.e. ndims(x) = 2).  A point is the degenerate case where an array, has
%   size of one in all dimensions, i.e. the array is singleton in all dimensions.
%   Function checks whether item is a point by checking that its length
%   in all dimensions is one.
%
% ERRORS
%   WMTSA:InvalidNumArguments
%
% TOOLBOX
%   wmtsa/utils
%
% CATEGORY
%   WMTSA Utilities
%

% AUTHOR
%   Charlie Cornish
%

    
function [tf] = wmtsa_isscalar(x)
% wmtsa_isscalar -- Determine if item is a point.
%
%****f* wmtsa.utils/wmtsa_isscalar
%
% NAME
%   wmtsa_isscalar -- Determine if item is a scalar.
%
% USAGE
%   [tf] = isscalar(x)
%
% INPUTS
%   * x          -- item to check (object).
%
% OUTPUTS
%   * tf          -- flag indicating whether item is a point (numeric Boolean).
%
% DESCRIPTION
%   In MATLAB, points, vectors and matrices all have a dimensionality of two,
%   (i.e. ndims(x) = 2).  A point is the degenerate case where an array, has
%   size of one in all dimensions, i.e. the array is singleton in all dimensions.
%   Function checks whether item is a point by checking that its length
%   in all dimensions is one.
%
% ERRORS
%   WMTSA:InvalidNumArguments
%
% TOOLBOX
%   wmtsa/utils
%
% CATEGORY
%   WMTSA Utilities
%

% AUTHOR
%   Charlie Cornish
%
% CREATION DATE
%   2005-Feb-03
%
% COPYRIGHT
%
%
% CREDITS
%
%
% REVISION
%   $Revision: 612 $
%
%***

%   $Id: wmtsa_isscalar.m 612 2005-10-28 21:42:24Z ccornish $

usage_str = ['Usage:  [tf] = ', mfilename, '(x)'];

%%  Check input arguments and set defaults.
error(nargerr(mfilename, nargin, [1:2], nargout, [0:2], 1, usage_str, 'struct'));

sz = size(x);

if ( (sum(sz) / length(sz)) == 1)
  tf = 1;
else
  tf = 0;
end