code: def load_data(self, idx):
          
          for name in self:
              ndim = getattr(self, '_%s_ndim' % name)
              diskflag = getattr(self, '_%s_diskflag' % name)
              ramflag = getattr(self, '_%s_ramflag' % name)
              if diskflag:
                  file_ = getattr(self, '_%s_file' % name)
                  length_tot = 1
                  shape = []
                  for jdx in range(ndim):
                      length = getattr(self, '_%s_length_%s' % (name, jdx))
                      length_tot *= length
                      shape.append(length)
                  raw = file_.read(length_tot*8)
                  values = struct.unpack(length_tot*'d', raw)
                  if ndim:
                      values = numpy.array(values).reshape(shape)
                  else:
                      values = values[0]
              elif ramflag:
                  array = getattr(self, '_%s_array' % name)
                  values = array[idx]
              if diskflag or ramflag:
                  if ndim == 0:
                      setattr(self, name, values)
                  else:
                      getattr(self, name)[:] = values
docs: Load the internal data of all sequences.  Load from file if the
          corresponding disk flag is activated, otherwise load from RAM.