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MathGroup Archive 2006

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Re: Convert expression to polynomial

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70442] Re: Convert expression to polynomial
  • From: Bill Rowe <readnewsciv at sbcglobal.net>
  • Date: Mon, 16 Oct 2006 02:35:51 -0400 (EDT)

On 10/15/06 at 12:18 AM, diana.mecum at gmail.com (Diana) wrote:

>I am generating a list of partial sums which look like:

>x = 1 + (-t + t^2)^(-1) + 1/((-t + t^2)^2*(-t + t^4)) +  1/((-t +
>t^2)^4*(-t + t^4)^2*(-t + t^8))

>I then try to calculate the PolynomialQuotient[Numerator[x],
>Denominator[x], t], etc., and I get an error saying that x is not a
>polynomial function.

>I tried to find the command to put everything over a common
>denominator, but was unable to find this. Can someone help?

I think what you want is Together i.e., the common denominator 
would be

In[21]:=
Denominator[Together@x]

Out[21]=
(t - 1)^7*t^7*(t^2 + t + 1)^2*(t^6 + t^5 + t^4 + t^3 +
    t^2 + t + 1)
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