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: uv_barotropic.m
    path of file: ./repos/tracacode/1911-COAWST/script/mfiles/rutgers/utility
    
    the code of the file until where you have to start completion: function [ubar,vbar]=uv_barotropic(u,v,Hz,boundary);

%
% UV_BAROTROPIC:  Compute barotropic velocity components.
%
% [ubar,vbar]=uv_barotropic(u,v,Hz,boundary)
%
% This function computes vertically integrated (barotropic)
% velocity components for ROMS full grid or boundary edges.
%
% On Input:
%
%    u           U-component velocity (array or structure, U-points)
%    v           V-component velocity (array or structure, V-points)
%    Hz          Vertical level thicknesses (m) at RHO-points (3D array)
%
%    boundary    ROMS open boundary switch (1D array, OPTIONAL):
%
%                  boundary(1)        Process western  boundary
%                  boundary(2)        Process eastern  boundary
%                  boundary(3)        Process southern boundary
%                  boundary(4)        Process northern boundary
%
% On Output:
%
%    ubar        Vertically integrated U-velocity (array or structure)
%    vbar        Vertically integrated V-velocity (array or strcuture)
%
% If processing boundary data, the velocity data are structures
% with the following fields:
%
%    u.west   v.west   ubar.west   vbar.west
%    u.east   v.east   ubar.east   vbar.east
%    u.south  v.south  ubar.south  vbar.south
%    u.north  v.norht  ubar.north  vbar.north
%

% svn $Id: uv_barotropic.m 938 2019-01-28 06:35:10Z arango $

    
function [ubar,vbar]=uv_barotropic(u,v,Hz,boundary);

%
% UV_BAROTROPIC:  Compute barotropic velocity components.
%
% [ubar,vbar]=uv_barotropic(u,v,Hz,boundary)
%
% This function computes vertically integrated (barotropic)
% velocity components for ROMS full grid or boundary edges.
%
% On Input:
%
%    u           U-component velocity (array or structure, U-points)
%    v           V-component velocity (array or structure, V-points)
%    Hz          Vertical level thicknesses (m) at RHO-points (3D array)
%
%    boundary    ROMS open boundary switch (1D array, OPTIONAL):
%
%                  boundary(1)        Process western  boundary
%                  boundary(2)        Process eastern  boundary
%                  boundary(3)        Process southern boundary
%                  boundary(4)        Process northern boundary
%
% On Output:
%
%    ubar        Vertically integrated U-velocity (array or structure)
%    vbar        Vertically integrated V-velocity (array or strcuture)
%
% If processing boundary data, the velocity data are structures
% with the following fields:
%
%    u.west   v.west   ubar.west   vbar.west
%    u.east   v.east   ubar.east   vbar.east
%    u.south  v.south  ubar.south  vbar.south
%    u.north  v.norht  ubar.north  vbar.north
%

% svn $Id: uv_barotropic.m 938 2019-01-28 06:35:10Z arango $
%===========================================================================%
%  Copyright (c) 2002-2019 The ROMS/TOMS Group                              %
%    Licensed under a MIT/X style license                                   %
%    See License_ROMS.txt                           Hernan G. Arango        %
%===========================================================================%

% Set internal parameters.

if (nargin < 4),
  DoBoundary=0;
else,
  DoBoundary=1;
end