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MathGroup Archive 2001

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Re: Is there an "inverse" of ToRules?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg31053] Re: Is there an "inverse" of ToRules?
  • From: "Allan Hayes" <hay at haystack.demon.co.uk>
  • Date: Sat, 6 Oct 2001 03:32:21 -0400 (EDT)
  • References: <9pjgi4$3fr$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Mark,

Two ideas:

    {a->b,{c:>d}}/.r:Rule|RuleDelayed -> Equal

        {a==b,{c==d}}

    ToEquations[(Rule|RuleDelayed)[x_,y_]]:= x==y;
    ToEquations[z_]:= z;

    ToEquations//@{a->b,{c:>d}}

        {a==b,{c==d}}

You might want to flatten the outputs.

--
Allan
---------------------
Allan Hayes
Mathematica Training and Consulting
Leicester UK
www.haystack.demon.co.uk
hay at haystack.demon.co.uk
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

"Mark S. Coleman" <mcoleman at bondspace.com> wrote in message
news:9pjgi4$3fr$1 at smc.vnet.net...
>
> Greetings,
>
> Is there an "inverse" to the ToRules function? That is, a function
> that converts rules to equations (expressed in == form), which could
> then be used in the Solve function?
>
> Thanks,
>
> Mark




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