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: Get_Leq.m
    path of file: ./repos/SQAT/sound_level_meter
    
    the code of the file until where you have to start completion: function Leq = Get_Leq(levels,fs,dt,framelen_s)
% function Leq = Get_Leq(levels,fs,dt,framelen_s)
% function Leq = Get_Leq(levels)
% 
% 1. Description:
%
% 2. Stand-alone example:
%       % Obtain a one-second Leq:
%       lvls = Do_SLM(insig,fs,'A','f',100); % A-weighted, 'fast'
%       dt = 1; %s
%       Leq = Get_Leq(lvls,fs,dt); % Make sure you enter only mono signals
% 
% 3. Additional info:
%       Tested cross-platform: No
%       See also DO_SLM, Get_levels_SPL.m (inline function: il_get_Leq)

    
function Leq = Get_Leq(levels,fs,dt,framelen_s)
% function Leq = Get_Leq(levels,fs,dt,framelen_s)
% function Leq = Get_Leq(levels)
% 
% 1. Description:
%
% 2. Stand-alone example:
%       % Obtain a one-second Leq:
%       lvls = Do_SLM(insig,fs,'A','f',100); % A-weighted, 'fast'
%       dt = 1; %s
%       Leq = Get_Leq(lvls,fs,dt); % Make sure you enter only mono signals
% 
% 3. Additional info:
%       Tested cross-platform: No
%       See also DO_SLM, Get_levels_SPL.m (inline function: il_get_Leq)
% 
% Programmed by Alejandro Osses, HTI, TU/e, the Netherlands, 2014-2017
% Created on    : 13/07/2016
% Last update on: 13/07/2016 
% Last use on   : 24/01/2017 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

if nargin > 2
    if nargin < 4
        framelen_s = dt;
    end