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: sym2.m
    path of file: ./repos/robotics-toolbox-matlab
    
    the code of the file until where you have to start completion: %SYM2 Subclass of sym class
%
% This is ugly.  The provided sym class can only generate MATLAB functions, not
% expressions.  It can generate expressions in C and Fortran however.
%
% The only way to access this capability is direct to the MuPad engine, and since
% we can't change the sym class we use a subclass and add a matgen method


% Copyright (C) 1993-2017, by Peter I. Corke
%
% This fil
    
function f = matgen(s,varargin)
            %MATGEN  MATLAB representation of a symbolic expression.
            %   MATGEN(S) is a fragment of MATLAB that evaluates symbolic expression S.
            %
            %
            %   See also SYM/PRETTY, SYM/LATEX, SYM/CCODE.
            %
            % Based on sym.fortran().
            
            %   Copyright 1993-2012 The MathWorks, Inc.
            
            t = inputname(1);

            if isempty(t), t = 'T'; end