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MathGroup Archive 2004

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Re: Non-algebraic solution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52427] Re: Non-algebraic solution
  • From: "Jens-Peer Kuska" <kuska at informatik.uni-leipzig.de>
  • Date: Sat, 27 Nov 2004 01:40:20 -0500 (EST)
  • Organization: Uni Leipzig
  • References: <co6h5d$nmp$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

Needs["Graphics`ImplicitPlot`"]

With[{a = 1, b = 0.10, c = 1, d = 1},
ImplicitPlot[
Log[y/a] + b*Log[c + y/d] == -x, {x, -10, 100}, {y, 1/10, 100}]
]



Regards

  Jens

"B.Ravinder" <ravi at crest.ernet.in> schrieb im Newsbeitrag 
news:co6h5d$nmp$1 at smc.vnet.net...
> Dear all,
> I want to plot the following type of logarithmic equation having
> dependent variable y and independent variable x.
>
> Log[y/a] + b*Log[c+y/d] = -x
>
> where a,b,c and d are some arbitrary constants.
>
> First I tried to solve the equation for y using Solve function in
> Mathematica 4.2, but got the following error
> message:
> Solve:: tdep :
> The equations appear to involve the variables to be solved
> for in an essentially non-algebraic way.
>
>
> Could someone please guide me as to how do we solve such equation
> with/without Mathematica.
>                             or
> If possible, how to obtain y vs. x plot in Mathematica without soving them
> exactly.
> Waiting for the kind resonse.
>
> Regards,
> Ravi
> 



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