code: def _read_record(self, f, blk, chans):
          
          dat_in_rec = empty((len(chans), self.max_smp))
  
          i_ch_in_dat = 0
          for i_ch in chans:
              offset, n_smp_per_chan = self._offset(blk, i_ch)
  
              f.seek(offset)
              x = fromfile(f, count=n_smp_per_chan, dtype=EDF_FORMAT)
  
              ratio = int(self.max_smp / n_smp_per_chan)
              dat_in_rec[i_ch_in_dat, :] = repeat(x, ratio)
              i_ch_in_dat += 1
  
          return dat_in_rec
docs: Read raw data from a single EDF channel.
  
          Parameters
          ----------
          i_chan : int
              index of the channel to read
          begsam : int
              index of the first sample
          endsam : int
              index of the last sample
  
          Returns
          -------
          numpy.ndarray
              A vector with the data as written on file, in 16-bit precision