Can't write transfer function properly.

Hello everyone , need help about writing a transfer function . I know how we normally write the code for it but know i'm not able do it correctly.Always getting different errors

Answer 1

[Star Strider]

MATLAB does not recognise implicit multiplication.

Be sure to include multiplication operators (*) when you code ‘G’ just after your initial tf call.

[Walter Roberson]

Hint:

s = tf('s')

and after that you can just code the expression, making sure to use * for multiplication

[Star Strider]

@Walter Roberson — Thank you!

[Ahmet Cavit Dastan]

thank you but still getting different errors ,even with trying sys(s) instead of G(s) , can you check it ?

1. sys(s)= (s^2+3s+10)(s+5)/(s+3)(s+4)(s^2+5*s+100)
2. s = tf ('s')

[Walter Roberson]

s = tf('s')

s =
 
  s
 
Continuous-time transfer function.

sys = ((s^2+3*s+10)*(s+5)) /((s+3)*(s+4)*(s^2+5*s+100))

sys =
 
         s^3 + 8 s^2 + 25 s + 50
  -------------------------------------
  s^4 + 12 s^3 + 147 s^2 + 760 s + 1200
 
Continuous-time transfer function.

[Star Strider]

... and again!