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MathGroup Archive 2007

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

Out[2]=
Plus

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

Regards,
Jean-Marc


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