function arr = TWAUpdateArray(arr, beats)
% TWAUpdateArray.m
% Author: Alexander Khaustov; alexander dot khaustov at gmail dot com 
% Copyright (C) 2008 St.-Petersburg Institute of Cardiological Technics (Incart), www.incart.ru
% This software is released under the terms of the GNU General
% Public License (http://www.gnu.org/copyleft/gpl.html).
% 
% Adjust array length for TWA SM analysis 
l = length(arr);
    if (l < beats)
        arr(l + 1 : 2 : beats) = arr(l - 1);
        arr(l + 2 : 2 : beats) = arr(l);
    end;

return;