       Re: Polynomial to List

• To: mathgroup at smc.vnet.net
• Subject: [mg76916] Re: Polynomial to List
• From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
• Date: Wed, 30 May 2007 05:13:53 -0400 (EDT)
• Organization: The Open University, Milton Keynes, UK
• References: <f3grip\$49r\$1@smc.vnet.net>

```Nick Hoffman wrote:
> I have a polynomial,
> Lets say:
>
> 1 + x + x^2 + x^3 + x^4
>
>
> and all I need to do is get that into a list of this form
>
> {x^4, x^3, x^2, x, 1}
>
> Any help would be greatly appreciated!  Thanks!

The head of the expression poly is Plus. We replace it by List thanks to
the Apply function (short cut @@), then sort the resulting list to get
the desired form.

In:=
poly = 1 + x + x^2 + x^3 + x^4;
Reverse[List @@ poly]

Out=
Plus

Out=
{x^4, x^3, x^2, x, 1}

Regards,
Jean-Marc

```

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