sum of two inline function

Hi,
i want to sum two inline function. the functions that i want to sum are following;
f1=0;
     for i=1:20
          f2=f2(x(1),x(2),x(3))
          f1=f1+f2
     end
how can i do by using inline function?

                             fl1=inline('0','x(1)','x(2)','x(3)');
                                  for i=1:20
is this true? f2=inline('f2(x(1),x(2),x(3)','x(1)','x(2)','x(3)')
                                      f1=inline(['(' char(f) ')+(' char(flog) ')']);
                                  end

Can anyone help me? Because i use this last summation function for fminsearch