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?

 采纳的回答

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).

2 个评论

Thank, you! This will solve my issue.
Can you show how this looks like in Simulink?

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