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MathGroup Archive 2004

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Re: Non-algebraic solution

  • To: mathgroup at
  • Subject: [mg52436] Re: [mg52399] Non-algebraic solution
  • From: yehuda ben-shimol <benshimo at>
  • Date: Sat, 27 Nov 2004 01:40:32 -0500 (EST)
  • References: <>
  • Sender: owner-wri-mathgroup at

Try ImplicitPlot
and for example
ImplicitPlot[(Log[y/a] + b*Log[c +
            y/d] == -x) /. {a -> 1, b -> 2, c -> 3, d -> 4}, {x, -4, 4}]
B.Ravinder wrote:

>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 
>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 
>Waiting for the kind resonse.

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