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

  FT_PREPROC_RESAMPLE resamples all channels in the data matrix
  Use as
    dat = ft_preproc_resample(dat, Fold, Fnew, method)
    dat    = matrix with the input data (Nchans X Nsamples)
    Fold   = scalar, original sampling frequency in Hz
    Fnew   = scalar, desired sampling frequency in Hz
    method = string, can be 'resample', 'decimate', 'downsample', 'fft'
  The resample method applies an anti-aliasing (lowpass) FIR filter to
  the data during the resampling process, and compensates for the filter's
  delay. For the other two methods you should apply an anti-aliassing
  filter prior to calling this function.