What is the correct way to extract coefficients (in a form I could use in
RecurrenceFilter) from a filter which I have represented as a Mathematica transfer function object, ie. something of the form
TransferFunctionModel[...]? I can easily extract the various parts of this object using array indices, but surely there is an "official" method?
I looked at the Mathematica documentation. But, for example, the coefficients used in
In here look like they've been copied manually from
In, rather than obtained through a coefficient extraction function.