Can't calculate magnitude and phase of a transfer function

I know of the commands abs() and angle(), but for some reason they're not working.

This is what I'm working with:

clear all
syms Req R_6 L C w

num1 = -Req*w^2/(Req+R_6)
den1= (-w^2 + 1/(L*C)) + 1i*(w/(C*(Req+R_6)))

func = num1/den1

abs(func)
angle(func)

However, it doesn't solve anything, it just says that the complex magnitude is |func| and that the phase is angle(func). How do I get the proper expressions?

[VBBV]

Which version of matlab are you using ?

[VBBV]

You require some inputs values for symbilic variables in your func

Answer 1

[Mathieu NOE]

hi

ok , I am using any symbolic stuff here

numerically speaking , everything works fine (as soon as there are dots when needed)

  Req = 1
  R_6 = 1
  L = 1
  C = 1
  w = logspace(0,3,10)
  
num1 = -Req*w.^2./(Req+R_6);
den1= (-w.^2 + 1/(L*C)) + 1i*(w/(C*(Req+R_6)));
func = num1./den1;
abs(func)
angle(func)