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MathGroup Archive 1995

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Re: Shortening Polynomials

  • To: mathgroup at christensen.cybernetics.net
  • Subject: [mg422] Re: [mg413] Shortening Polynomials
  • From: danl (Daniel Lichtblau)
  • Date: Tue, 24 Jan 1995 11:04:17 -0600


>...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?
>....

  You can do this by
Normal[Series[t1, {q,0,2}]]
If desired, Series/Normal will handle more variables.

  Daniel Lichtblau, WRI


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