Question: How can I define a symbolic time continous transfer function out of 2 vectors?

I want to create a simple symbolic transfer function from 2 vectors, lets say:        num=<a,b,c>

                                                                                                                               den=<c,b,a,d>
So my transfer function should look like this:
              H(s) = (a*s^2 + b*s + c)/(c*s^3 + b*s^2 +a*s+d)

 

This should be very simple but I haven't found a solution on the forums yet...

Thank you.

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