Re: extracting powers and coefficients from a polynomial

• To: mathgroup at smc.vnet.net
• Subject: [mg49070] Re: extracting powers and coefficients from a polynomial
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Wed, 30 Jun 2004 05:34:16 -0400 (EDT)
• Organization: Universitaet Leipzig
• References: <cbrcau\$iqc\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Hi,

expr = Expand[(Sum[x^i, {i, 6}])^3];

MapIndexed[{#2[[1]] - 1, #1} &, CoefficientList[expr, x]] /. {_, 0} :>
Sequence[]//TableForm

Regards
Jens

AngleWyrm wrote:
>
> I have made a formula that produces a polynomial expansion, and I wish to
> extract the powers and coefficients into a list.
>
> Expand[(Sum[x^i, {i, 6}])^3]
>   1x^3 + 3x^4 + 6x^5 + 10x^6 + 15x^7 + 21x^8 + 25x^9 + 27x^10 + 27x^11 + 25x^12
> + 21x^13 + 15x^14 + 10x^15 + 6x^16 + 3x^17 + 1x^18
>
> How do I make a table of the powers and coefficents?
> 3, 1
> 4, 3
> 5, 6
> 6, 10
> ....
>
> --
> AngleWyrm
> The C++ hat random selection container:
> http://home.comcast.net/~anglewyrm/hat.html

```

• Prev by Date: MATHEMATICA AND FINANCIAL CALCULATIONS?
• Next by Date: Re: extracting powers and coefficients from a polynomial
• Previous by thread: Re: extracting powers and coefficients from a polynomial
• Next by thread: Re: extracting powers and coefficients from a polynomial