python and filter design: calculating "s" optimal transform

[cassiope]

On Jun 1, 2:58 pm, Terry Reedy <tjre... at udel.edu> wrote:
> On 6/1/2010 2:18 PM, robert somerville wrote:
>
> > Hi;
> > this is an airy question.
>
> > does anybody have some code or ideas on how to calculate the optimal "S"
> > transform of user specified order (wanting the coefficients)  for a
> > published filter response curve, ie.
>
> > f(s) = 1.0/(a1*S^2 + a2*S + a3)
>
> If you do not get an answer here, try the scipy list.

Say what????

There are tables of coefficients for Butterworth, Bessel, and other
standard filter forms.
Could you be a little clearer on what you're trying to do?