How to get number of factors after factorizing a symbolic function?

I'm using factor to factorize a symbolic polynomial.

Works well but when the result is a symbolic vector containing the factors, I'm not sure how to determine how many factors it contains. I tried using size but I get some inconsistent results:

>> G(s) = s^2 + 3*s + 2;
>> F = factor(G, s)
 
F(s) =
 
[ s + 2, s + 1]
 
>> size(F)

ans =

     1     1

>> F = factor(G(s), s)
 
F =
 
[ s + 2, s + 1]
 
>> size(F)

ans =

     1     2

>> 

Note, the size is different in the second example. The only difference is that I used factor(G(s), s) rather than factor(G, s). What is the difference and why does the result (F) look the same but the size is not the same?

[Bill Tubbs]

Ah, I think I know what is going on. class(G) is 'symfun' whereas class(G(s)) is 'sym'.

I guess I need to decide whether to pass the function itself or the symbolic expression it returns given s.

If I only pass the function (G), how would I determine how many factors it has? I.e. the dimension of the symbolic function.

[madhan ravi]

Now you don’t see Star’s answer below.

Answer 1

[madhan ravi]

 numel(formula(F)) % will avoid confusions ;)

[Bill Tubbs]

This seems to work whether F is an expression or a function. Thanks!