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From: "Dejun Wang" <dejunwang@yahoo.com>
Newsgroups: comp.soft-sys.matlab
Subject: polynomial factorization
Date: Fri, 22 Feb 2008 23:05:03 +0000 (UTC)
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Hi, I have a polynomial in the following form:
H(z)=[z^4+a3*z^3+a2*z^2+a1*z+a0]/
[z^5+b4*z^4+b3*z^3+b2*z^2+b1*z+b0], where a3-a0,b4-b0 are 
known.
I want to obtain a factorized polynomial in the form of 
H(z)=A/(z-p0)+B/(z-p1)+C/(z-p2)+D/(z-p3)+E/(z-p4), I know 
I can use roots to get p0-p5, but is there a function that 
I can use to get the value of A,B,C,D,E? Or do I need to 
create my own symbolic equations to solve this?

Thanks.