def setUp(self):
        itau_data = get_itau_data_from_file()
        self.header_arquivo = itau_data['header_arquivo']
        self.seg_p = itau_data['seg_p1']
        self.seg_p_str = itau_data['seg_p1_str']
        self.seg_q = itau_data['seg_q1']
        self.seg_q_str = itau_data['seg_q1_str']
def torque_fft(order, torque, ax=0):
    """plot torque harmonics"""
    unit = 'Nm'
    scale = 1
    if np.min(torque) < -9.9e3 or np.max(torque) > 9.9e3:
        scale = 1e-3
        unit = 'kNm'
    if ax == 0:
        ax = plt.gca()
    ax.set_title('Torque Harmonics / {}'.format(unit))
    ax.grid(True)

    try:
        bw = 2.5E-2*max(order)
        ax.bar(order, [scale*t for t in torque], width=bw, align='center')
        ax.set_xlim(left=-bw/2)
    except ValueError:  # empty sequence
        pass