Le 24/07/2022 à 13:34, Samuel Gougeon a écrit :

Sorry, but nothing is clear to me about your statements:

1) what shows you that iir() is correct while the analpf + horner way is not?

2) With the analpf + horner method, assuming that it is not correct, what shows you that horner is not correct, while analpf is correct, instead of the opposite or both incorrect?

3) do you have a reference about the equivalence?

4) have you tried after simp_mode(%f)?

By the way, you may edit iir(). You will see that it uses analpf() as well, plus bilt() and trans() instead of (directly) horner.
Then editing bilt and trans show a lot of code...

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