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MathGroup Archive 2007

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Re: How to choose real positive solutions only?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg74367] Re: How to choose real positive solutions only?
  • From: dh <dh at metrohm.ch>
  • Date: Mon, 19 Mar 2007 21:51:28 -0500 (EST)
  • References: <etije4$irj$1@smc.vnet.net>


Hi Manfred,

you can use Reduce with the domain: Reals.

Daniel



Dix, Manfredo A wrote:

> Hello,

> this question probably came up before, but anyway:

> 

> suppose I have a system of 3 equations and 3 unknowns,

> which I want to solve numerically with NSolve.

> They are polynomial of degree "n" so that I get n solutions.

> 

> Is there a way to tell Mathematica to just return the

> real positive solutions, and dismiss the imaginary and negative

> ones?

> 

> thank you so much for any help,

> cordially,

> 

> Manfred

> mdix at tulane.edu

> 

> 




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