Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_preproc_medianfilter”.

  FT_PREPROC_MEDIANFILTER applies a median filter, which smooths the data with a
  boxcar-like kernel, except that it keeps steps in the data. This function requires
  the MATLAB Signal Processing toolbox.
  Use as
    [dat] = ft_preproc_medianfilter(dat, order)
    dat        data matrix (Nchans X Ntime)
    order      number, the length of the median filter kernel (default = 25)
  See also PREPROC