How can i convert my code to matlab 7 ?

Question

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So recently i've been asked to do a project about Simpson's composite rule and i worked the whole thing with matlab r2017, but my teacher asked me to do it on Matlab 7 (because the computers of the school only do have Matlab 7.0 R14 2004) when i tried to execute my program on this version of matlab i've faced so many problems and didn't work because of librairies i think so please what can be the alternative for this code in an ancient machine and thanks for your reply in advance

      function IntegralS = SimpsonComposite()

%     Inputs :
%     --------
      funstr = input('Please enter your function : ', 's');
      f = str2func( ['@(x) ' funstr ] );
      a = input('Please enter the point a : ');
      b = input('Please enter the point b : ');
      n = input('Please enter how many time you want to use this formula : ');
      h = (b-a)/(2*n);
      xi = a:h:b;

%     The primitive of your function :
%     --------------------------------
      syms x;
      fprintf('The primitive of your function is : %s \n', int(f,x));

%     calculate the integral :
%     ------------------------
      fprintf('The value of this integral is : %s\n ', integral(f,a,b));

%     The value of this integral with Simpson's composite is  : 
%     ---------------------------------------------------------
      Integrale = h/3 * (f(xi(1)) + (f(xi(end))) + 4.*sum(f(xi(2:2:end))) + 2.*sum(f(xi(3:2:end-2))));
      fprintf('The value of this integral via Simpson''s composite is : %s\n ', Integrale);
      disp(' ');

%     The points of this integral are :  
%     ---------------------------------
      disp ('The points of this integral are : ');  
      disp(sym(xi));

%     The results of these points with our function :  
%     -----------------------------------------------
      disp ('The results of these points with our function : ');  disp(f(xi));

%     The value of h is :
%     -------------------
      fprintf('The value of h is : %s', sym(h));

%     The error bound is :
%     --------------------
      syms x;
      Errorbound =  integral(f,a,b) -  Integrale;
      fprintf('The error bound is : %s\n', Errorbound);