vis.revcorr.get_frames

 GET_FRAMES - extract the hartley stimulus parameters and time points
  in a given interval [t0, t1]

  [HARTLEY_STIMULUS_PARAMETERS, HARTLEY_STIMULUS_TIMES] = vis.revcorr.get_frames(S, KX_V, KY_V, FRAMETIMES, T0, T1)

  Inputs:
   S - the s parameters of the hartley stimulus
   KX_V - the kx parameters of the hartley stimulus
   KY_V - the ky parameters of the hartley stimulus
   FRAMETIMES - the time points of the hartley stimulus
   T0 - the start time of the interval
   T1 - the end time of the interval

  OUTPUTS:
   HARTLEY_STIMULUS_PARAMETERS - a structure containing the s, kx, and ky parameters
   HARTLEY_STIMULUS_TIMES - the time points of the hartley stimulus in the interval