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MathGroup Archive 2007

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Re: How to Eliminate

  • To: mathgroup at smc.vnet.net
  • Subject: [mg75062] Re: How to Eliminate
  • From: Jean-Marc Gulliet <jeanmarc.gulliet at gmail.com>
  • Date: Mon, 16 Apr 2007 04:09:03 -0400 (EDT)
  • Organization: The Open University, Milton Keynes, UK
  • References: <evsr25$14h$1@smc.vnet.net>

JikaiRF at aol.com wrote:
> Dear Members:
> When I use "Solve" in order to solve polynomials with high orders, its
> solutions are usually reterned in terms of a pair of nested braces,
> like {{x -> 0.1}, {x -> 0.5}}. In this situation, I would like to
> obtain a pair of braces such as {0.1, 0.5}.  In other words, I would
> like to know how to eliminate x ->.
> How can I obtain my result?
> 
>       Sincerely
>       F. Takata.

The solution for x is returned as a transformation rule. You can use the
replacement operator /. to apply the rule. See [1] for detailed information.

In[1]:=
sols = {{x -> 0.1}, {x -> 0.5}}

Out[1]=
{{x -> 0.1}, {x -> 0.5}}

In[2]:=
vals = x /. sols

Out[2]=
{0.1, 0.5}

Regards,
Jean-Marc

[1] _The Mathematica Book_, "1.4.2 Values for Symbols",
http://documents.wolfram.com/mathematica/book/section-1.4.2


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