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

  FT_DOCUMENTATIONINDEX is a helper function to maintain the online documentation.
 
  Normal users will not be calling this function, but will rather look at
  http://www.fieldtriptoolboxorg/reference/index where the output of this
  function can be found.
 
  See also FT_DOCUMENTATIONREFERENCE