RE: Convert expression to polynomial

• To: mathgroup at smc.vnet.net
• Subject: [mg70427] RE: [mg70383] Convert expression to polynomial
• From: "David Park" <djmp at earthlink.net>
• Date: Mon, 16 Oct 2006 02:34:30 -0400 (EDT)

```Diana,

Have you tried Together?

step1 = 1 + 1/(-t + t^2) +
1/((-t + t^2)^2*(-t + t^4)) +
1/((-t + t^2)^4*(-t + t^4)^2*(-t + t^8));

step2 = Together[step1]

PolynomialQuotient[Numerator[step2], Denominator[step2], t]
PolynomialRemainder[Numerator[step2], Denominator[step2], t]

David Park

From: Diana [mailto:diana.mecum at gmail.com]
To: mathgroup at smc.vnet.net

Math folks,

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?

Thanks,

Diana M.

```

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