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