Change the class from double to sym of a cell array

Is there anyway to get D as [ s + 3 ; s + 2] in the following program.

i.e. I want to change the class of D from double to sym

syms s
D = {[1 3] ; [1 2]}
%N= {[1];[1] }
%G=tf(N,D)

Answer 1

[Walter Roberson]

   cellfun(@tf, N, D)

[RoboKid]

Can you be more specific on how could change the class of just D. D = {[1 3] ; [1 2]}

--Thanks

[Walter Roberson]

Is the purpose not to go through matching elements of N and D and putting the corresponding elements through tf() to get the symbolic transfer function relevant for that pair of matching elements? If so then the code I gave should do that. You can overwrite D with the result if you want to.

If you are trying to convert D = {[1 3] ; [1 2]} to [s + 3 ; s + 3] without using tf(), then I would have to ask why two different arrays, [1 3] and [1 2] are both to be converted to s + 3 ?

[RoboKid]

I'm sorry .. I typed wrong s+3 instead s+1, I just wanted to change the class of D from 'cell' to sys.. and it's work with cellfun. thanks.