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MathGroup Archive 2004

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AW: 7 equations and 7 unknowns (non-linear equations)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg49459] AW: [mg49448] 7 equations and 7 unknowns (non-linear equations)
  • From: Matthias.Bode at oppenheim.de
  • Date: Wed, 21 Jul 2004 06:39:19 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

Hello Arthur,

there are several paths, each of them specific:

1. Solve[] for analytically solvable systems of equations.

2. FindRoot[] for systems of equations that have to be solved numerically.

Without knowing anything about your equations it's difficult to be more
precise.

Best regards,
Matthias Bode
Sal. Oppenheim jr. & Cie. KGaA
Untermainanlage 1
D-60329 Frankfurt am Main
GERMANY
Tel.: +49(0)69 71 34 53 80
Mobile: +49(0)172 6 74 95 77
Fax: +49(0)69 71 34 95 380
E-mail: matthias.bode at oppenheim.de
Internet: http://www.oppenheim.de



-----Ursprüngliche Nachricht-----
Von: manushidsl at ameritech.net [mailto:manushidsl at ameritech.net] 
Gesendet: Dienstag, 20. Juli 2004 13:54
An: mathgroup at smc.vnet.net
Betreff: [mg49448] 7 equations and 7 unknowns (non-linear equations)


Hi, 
I'm trying to solve for an exit temprature in a forced air heat
exchanger and I have a total of 7 equations and also 7 unknowns.  I'm
not sure how to go about it by using mathematica to solve these
equatins.  So far I have typed in the equations on a new mathematica
document and have also declared some of the known varialbes.  After
I'm done typing them in I press Shift + Enter and the results that
come out are very confusing (I do no think it is giving me a proper
answer).  Is there a specific path that I must follow to selve for
these equations?  

thanx, 
Arthur


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