docs: def update_event_data(self, num, data):
          """Update event data in dataset."""
          if num < 0 or num >= self.params["events_num"]:
              raise IndexError("Index out of range [0:%s]" %
                               (self.params["events_num"]))
  
          if isinstance(data, np.ndarray):
              raise TypeError("data should be np.ndarray")
  
          if data.dtype != np.short:
              raise TypeError("data array dtype should be dtype('int16')")
  
          ch_num = self.params['channel_number']
          ev_size = self.params['b_size']
  
          if data.shape != (ch_num * ev_size,):
              raise Exception("data should contain same number of elements "
                              "(%s)" % (ch_num * ev_size))
  
          self.file.seek(7168 + num * (96 + 2 * ch_num * ev_size) + 96)
          self.file.write(data.tostring())
          self.file.flush()