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/spm12/@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

    
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 5079 2012-11-25 18:38:18Z vladimir $

if nargin >1        
    if ~isnumeric(ind)
        ind = 1:nfrequencies(this);
    end