function vel = dotpush_param ( n, t, tp, vp, th )
% 押している点の速度
    if (t <= tp)
        vel = repmat([0;-vp], n, 1);
    elseif (t <= tp+th)
        vel = repmat([0;0], n, 1);
    else
        vel = repmat([0;0], n, 1);
    end
end
