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MathGroup Archive 2000

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Re: Re: Solve...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg25777] Re: [mg25747] Re: [mg25681] Solve...
  • From: Reza Malek-Madani <research at nadn.navy.mil>
  • Date: Sun, 22 Oct 2000 23:30:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

I had a similar problem; the kernel did not shut down but the definition
of f was earsed. The following, however, seems to work alright:

f[w_] = Together[1./(w^2) + (.9/30.)/(w - 2. Sqrt[200./10.]k)^2 - 1. -
      (3./30.)/(Sqrt[200./10.]k^2)];
Solve[Numerator[f[w]] == 0, w]

Reza Malek-Madani


Department of Mathematics       Phone:410-293-2504 (FAX -2507)
589 McNair Road                 DSN:      281-2504
U.S. Naval Academy              Nimitz Room 17 in ERC
Annapolis MD 21402-5031         Email: research at usna.edu

--------------------------------------------------------------------------


On Sat, 21 Oct 2000, Chris Johnson wrote:

> I had the same problem.  After deleting the space between the : and = in
> the function definition, the Solve command caused a crash on my
> system.  The Kernal shut down and had to be restarted.
> 
> I'm using v. 4.0.2 on Windows NT.
> 
> Chris
> 
> On Thu, 19 Oct 2000, Anesh Sooklal wrote:
> 
> > Dear mathgroup,
> > 
> > I have been trying to solve the following equation using Solve,
> > When I type in the following line I get a message saying that an illegal
> > operation has been performed.
> > 
> > f[w_]: = 1./(w^2)  + (.9/30.)/(w - 2. Sqrt[200./10.]k)^2   - 1.-
> > (3./30.)/( Sqrt[200./10.]k^2 )
> > 
> > Solve[f[w]==0., w]
> > 
> > Can anyone tell me what I am doing wrong. My aim is to generate a set a
> > roots,w , which is a function of k.
> > 
> > Thanking you in advance
> > Aneshkumar Sooklal
> > Research Assistant
> > Dept. of Physics
> > University of Durban-Westville
> > South Africa
> > 
> > Tel: (031) 204 4991
> > email: anesh at fermi.udw.ac.za
> > 
> > Physics Homepage: http://fermi.udw.ac.za
> > Plasma Physics Homepage:  http://plasma.udw.ac.za
> > 
> > 
> > 
> > 
> 
> 
> 



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