Is Varying Transfer Function description wrong?

In Varying Transfer Function (https://www.mathworks.com/help/control/ref/varyingtransferfunction.html) settings dialog showed the following equation:

             b0 + b1 s + ... + bN s^N 
  H(s) = -------------------------------- 
               a0 + a1 s + ... + s^N

This equatin also showed as block image.

But in block help article it says:

             b0 + b1 s + ... + bN s^N 
  H(s) = -------------------------------- 
               1 + a1 s + ... + aN s^N

I think the second formula is correctly describing this block, but in both cases I can't set one coefficient in denominator. Is there a way to set all coefficients in denominator?

Answer 1

[Raghunandan V]

You can take a0 common and make the first coefficient 1. from this you can set all the coefficient and then multiply the whole block by (1/a0).

[Antony]

Thank, you! This will solve my issue.

[Mar]

Can you show how this looks like in Simulink?