Shortening Polynomials

*To*: mathgroup at christensen.cybernetics.net*Subject*: [mg413] Shortening Polynomials*From*: corcoran (Stephen Corcoran) <corcoran%markov.stats at comlab.oxford.ac.uk>*Date*: Wed, 18 Jan 1995 12:41:12 +0000

Dear Mathgroupers, Many thanks for all the replies I got for my previous requests. I have a feeling this may be trivial, but I often want to shorten polynomials, after using Expand. At the moment, I use the following type of unwieldy expression: t1 = a0 + a1 q + a2 q^2 ; Expand[%^4] /. {q^3->0,q^4->0,q^5->0,q^6->0,q^7->0,q^8->0}; Is there a neater way to collect powers up to order m after expanding a polynomial? Thanks, Stephen -------------------------------------------------------------------------- Stephen Corcoran, email: corcoran at stats.ox.ac.uk (internet) Dept. of Statistics, corcoran at uk.ac.ox.stats (janet) University of Oxford, 1, South Parks Road phone: (0865) 272879 OXFORD, OX1 3TG fax: (0865) 272595 --------------------------------------------------------------------------