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: read_veres_WD.m
    path of file: ./repos/MSS/HYDRO/utils/readdata
    
    the code of the file until where you have to start completion: function vessel = read_veres_WD(filename, disp_flag)
% vessel = read_veres_WD(filename, disp_flag)
%
% Read and process data from Veres output file *.re2
%
% Inputs:
%   filename: 	Text string *.re2 with name of VERES output file
%
%   disp_flag: 	1 for displaying results to screen
%				2 for also displaying WD amplitude plots
%				0 for none of the above
%
% Outputs (MSS vessel structure):
%
%   vessel.driftfrc.

    
function vessel = read_veres_WD(filename, disp_flag)
% vessel = read_veres_WD(filename, disp_flag)
%
% Read and process data from Veres output file *.re2
%
% Inputs:
%   filename: 	Text string *.re2 with name of VERES output file
%
%   disp_flag: 	1 for displaying results to screen
%				2 for also displaying WD amplitude plots
%				0 for none of the above
%
% Outputs (MSS vessel structure):
%
%   vessel.driftfrc.
%       amp{dof}(freqno,headno,velno):    wave drift force amplitudes for
%                                         dof = 1,2,6
%       w(1,freqno):                      circular wave frequencies
%
%		vessel.headings:                  wave directions
%		vessel.velocities:                vessel speeds
%
% For a given wave, the wavedrift force F is given as:
%
%     F = vessel.driftfrc.amp{dof}*zeta_a^2,   dof = 1,2,6
%
% where amp{dof} is the amplitude magnification found from the wavedrift table
% and zeta_a is the wave amplitude.
%
% Authors:   ?. N. Smogeli and T. I. Fossen
% Date:      2005-05-11
% Revisions: 2007-12-10 T. I. Fossen - R1.0
% _________________________________________________________________________
%
% MSS HYDRO is a Matlab toolbox for guidance, navigation and control.
% The toolbox is part of the Marine Systems Simulator (MSS).
%
% Copyright (C) 2008 Thor I. Fossen and Tristan Perez
% 
% 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 3 of the License, 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 program.  If not, see <http://www.gnu.org/licenses/>.
% 
% E-mail: contact@marinecontrol.org
% URL:    <http://www.marinecontrol.org>

if ~exist('disp_flag')
	disp_flag = 3;
end