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MathGroup Archive 2005

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Re: solve() problem since new ROM update

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56949] Re: [mg56926] solve() problem since new ROM update
  • From: Bob Hanlon <hanlonr at cox.net>
  • Date: Wed, 11 May 2005 05:24:04 -0400 (EDT)
  • Reply-to: hanlonr at cox.net
  • Sender: owner-wri-mathgroup at wolfram.com

Solve[x^4-1==3,x]

{{x -> -Sqrt[2]}, {x -> (-I)*Sqrt[2]}, {x -> I*Sqrt[2]}, {x -> Sqrt[2]}}

Select[%, FreeQ[#,Complex]&]

{{x -> -Sqrt[2]}, {x -> Sqrt[2]}}


Bob Hanlon

> 
> From: Mike <jenningsmca_REMOVETHIS at hotmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/05/10 Tue AM 03:42:41 EDT
> Subject: [mg56949] [mg56926] solve() problem since new ROM update
> 
> I have tried multiple problems (simple ones albiet) to solve while in
> ALG mode.
> SOLVE(x^4 - 1 = 3, x)
> but this provides no result. Just returns the question with no answer.
> The answer should be x = -Sqrt(2) or x = sqrt(2).
> 
> The example works in RPN, but I use both environments depending what I
> am doing. It worked before the upgrade. 
> Am I missing something here!
> 
> - Mike
> 
> 

Bob Hanlon
Chantilly, VA


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