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Re: change of a coefficient in a polynomial

• To: mathgroup at smc.vnet.net
• Subject: [mg44799] Re: change of a coefficient in a polynomial
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 27 Nov 2003 11:38:23 -0500 (EST)
• Organization: Universitaet Leipzig
• References: <bpurvg$oc7$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de
• Sender: owner-wri-mathgroup at wolfram.com

Hi,

c[0] + c[1] x + c[2] x^2 /. 
  a_ + p_ /; PolynomialQ[p, x] && FreeQ[a, x] :> p - a

??

Regards
  Jens

Paolo Bientinesi wrote:
> 
> Second question about polynomials:
> 
> assume you are given a polynomial
> 
> p[x_] :=  c[0] + c[1] x + c[2] x^2 ....
> 
> and you want to generate a polynomial p1[x] from p[x]
> changing one coefficient only, like:
> 
> p1[x_] := -c[0] + c[1] x + c[2] x^2
> 
> Is there any other way other than the obvious CoefficientList
> solution?
> 
> Thanks
> --
> Paolo
> 
> pauldj at cs.utexas.edu                    paolo.bientinesi at iit.cnr.it