Why am I getting the wrong output with this MATLAB code

why am I gettng the wrong output in MATLAB with this code? The gain in the numerator is 2 in my input but comes out as 0.5 in the output

s=zpk('s');
g5= (2*(s+8))/((s+3)*(s+0.1)*(4*s+6));
%%output
g5 =
 
        0.5 (s+8)
  ---------------------
  (s+3) (s+1.5) (s+0.1)

Answer 1

[Walter Roberson]

zpk and tf representation normalizes the first coefficient of the denominator to be 1.

[James Mwage]

Its the numerator that has the problem.

[Walter Roberson]

Notice the denominator has 4*s+6 . Normalize that to 4*(s+1.5) in the denominator, and then divide the 2 in the numerator by the 4 in the denominator to get 0.5 in the numerator and 1 in the denominator, and you can see the s+1.5 term in the middle of the output. Therefore the expressions are equivalent. and there is no calculation problem.