polynomial operations through CoefficientList
- To: mathgroup at smc.vnet.net
- Subject: [mg44729] polynomial operations through CoefficientList
- From: Paolo Bientinesi <pauldj at cs.utexas.edu>
- Date: Mon, 24 Nov 2003 00:05:18 -0500 (EST)
- Organization: University of Texas at Austin
- Sender: owner-wri-mathgroup at wolfram.com
Hello, does anybody have 2 functions ready to multiply and add 2 polynomials directly from their CoefficientList's? example: the polynomials I'm considering are p1[x_] := 1 + k1 x - 2 k2 x^2 p2[x_] := -2 -k3 x Given cf1 = {1,k1,-2 k2} and cf2 = {-2,-k3} I would like to get the list {-2,-2 k1-k3,4 k2-k1 k3,2 k2 k3} for p1[x]*p2[x] and the list {-1,k1-k3,-2 k2} for p1[x]+p2[x] without performing operations like CoefficientList[ cf1.Table[x^i,{i,0,Length[cf1]-1}]* cf2.Table[x^i,{i,0,Length[cf2]-1}], x] Thanks! -- Paolo pauldj at cs.utexas.edu paolo.bientinesi at iit.cnr.it
- Follow-Ups:
- Re: polynomial operations through CoefficientList
- From: Daniel Lichtblau <danl@wolfram.com>
- Re: polynomial operations through CoefficientList