# Apply a Continued Fraction Operation to a Filter Model

Posted 3 months ago
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 Hello, Does anyone know of any way to generate a continued fraction from a Filter Model? Thanks.
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Posted 3 months ago
Posted 3 months ago
 Thanks for your response.I've pretty much concluded that the only way to work with these analog filter models besides plotting them or running time domain simulations in System Modeller is to extract the zeros and poles, with those form polynomials and a rational transfer function and then manipulate that as one normally does. I was just hoping that I was missing something and that there was a way to extract the transfer function directly for further manipulations.Thanks.
Posted 3 months ago
 If you are looking for the underlying expression you can do the following: BesselFilterModel[3][ss][[1,1]] and get 15./(15. + 26.335085835*ss + 18.494313224981806*ss^2 + 5.4116591804363505*ss^3) 
Posted 3 months ago
 Thanks Suba! That saved me a boat load of work. Where in the documentation does it say that?
Posted 3 months ago
 I was not able to find it in documentation either (I asked Suba to weigh in for that reason).
Posted 3 months ago
 Thanks Suba! That saved me a boat load of work. Where in the documentation does it say that?
Posted 3 months ago
 I was not able to find it in documentation either (I asked Suba to weigh in for that reason).
Posted 3 months ago
 The first one in Properties & Relations [link]Other occurrences can be found elsewhere as well [link] [link]
Posted 3 months ago
Posted 3 months ago
 You are not seeing the following?
Posted 3 months ago
 I'm looking at your other links and I'm not seeing it there either.