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MathGroup Archive 2004

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Non-algebraic solution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52399] Non-algebraic solution
  • From: "B.Ravinder" <ravi at crest.ernet.in>
  • Date: Fri, 26 Nov 2004 01:04:27 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

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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