MATLAB: How to convert a transfer fuction (tf class) to a symbolic equation (sym)

controlstransfer function

I have a transfer function that I need in symbolic form but I haven't been able to find a way of doing this. This is what I have:

 EQN =
       6
  -----------
  s^3 + 2 s^2
Continuous-time transfer function.

This is what I need:

eqn = 6/(s^3 + 2*s^2)

Any ideas?

Never mind I figured it out, but to those who want to know:

sys = tf([1 0],[1 2 3])
[Num,Den] = tfdata(sys);
sys_syms = poly2sym(cell2mat(Num),s)/poly2sym(cell2mat(Den),s)

Credit goes to:

sys1=tf([20 20],poly([-4 -3]));
[Num,Den] = tfdata(sys1,'v');
syms s
sys_syms=poly2sym(Num,s)/poly2sym(Den,s);
lim = limit(sys_syms,s,0)

To convert a transfer function object "t" into a symbolic object, use the following code:

   t = tf(1:3,4:6);
   [num,den] = tfdata(t);
   syms s
   t_sym = poly2sym(cell2mat(num),s)/poly2sym(cell2mat(den),s)

This results in:

 t_sym =
 (s^2+2*s+3)/(4*s^2+5*s+6)

From here, you can use Symbolic Math Toolbox functions, like CCODE, FORTRAN, or LATEX, on the t_sym object.

c = ccode(t_sym)
f = fortran(t_sym)
l = latex(t_sym)

This yields:

 c =
       t0 = (s*s+2.0*s+3.0)/(4.0*s*s+5.0*s+6.0);
 f =
       t0 = (s**2+2*s+3)/(4*s**2+5*s+6)
 l =
 {\frac {{s}^{2}+2\,s+3}{4\,{s}^{2}+5\,s+6}}