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MathGroup Archive 2005

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Re: How to use "Solve" to get only real number solutions?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55154] Re: How to use "Solve" to get only real number solutions?
  • From: foice <NONfoiceSPAMMARE at tiscalinet.it>
  • Date: Mon, 14 Mar 2005 04:28:35 -0500 (EST)
  • References: <d114lb$e18$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

On Sun, 13 Mar 2005 10:28:59 +0000 (UTC), "PengYu.UT at gmail.com" <PengYu.UT at gmail.com>
wrote:

>Hi All
>
>For example I have the following function and I want to find the
>solution of the quation shown below. But Mathematica showns not only
>real number solutions. Do you know how to restrict the solutions to
>only real numbers. Thanks!
>
>Best wishes,
>Peng
>
>intensity[x_, δ_, p_, λ_] := 1/4 + (2*Cos[(Pi*x)/100])/Pi +
>(4*Cos[(Pi*x)/100]^2)/Pi^2 - (2*Cos[(3*Pi*x)/100])/(3*Pi) -
> (8*Cos[(Pi*x)/100]*Cos[(3*Pi*x)/100])/(3*Pi^2) +
>(4*Cos[(3*Pi*x)/100]^2)/(9*Pi^2)
>
>Solve[intensity[x, 0, 200, 50] == 0.3*(1/4 + 32/(9*Pi^2) +
>(4*Sqrt[2])/(3*Pi)), x]

There's a package in the misc category called RealOnly.
It get out real results or a generical "NonReal".
Bye


-------------------------------------------------------------
tutto ciò che ho scritto è sempre In My Humble Opinion (IMHO)
probabilmente l'ho scritto di fretta, quindi scusate se sono stato sbrigativo.


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