You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: frequencies.m
    path of file: ./repos/malini/Codes/deconvolution - model/spm8/@meeg
    
    the code of the file until where you have to start completion: function res = frequencies(this, ind, f)
% Method for getting/setting frequencies of TF data
% FORMAT res = frequencies(this, ind, values)
% _________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Stefan Kiebel
% $Id: frequencies.m 4015 2010-07-23 16:35:03Z vladimir $

    
function res = frequencies(this, ind, f)
% Method for getting/setting frequencies of TF data
% FORMAT res = frequencies(this, ind, values)
% _________________________________________________________________________
% Copyright (C) 2008 Wellcome Trust Centre for Neuroimaging

% Stefan Kiebel
% $Id: frequencies.m 4015 2010-07-23 16:35:03Z vladimir $

if nargin < 3
    if strncmpi(transformtype(this), 'TF',2)
        res = this.transform.frequencies;
    else
        res = [];
        return
    end