Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2004
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2004

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Re: Non-algebraic solution

  • To: mathgroup at smc.vnet.net
  • Subject: [mg52457] Re: [mg52421] Re: [mg52399] Non-algebraic solution
  • From: "B.Ravinder" <ravi at crest.ernet.in>
  • Date: Sun, 28 Nov 2004 01:06:37 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

But the problem in my case is that a, b, c, d are Non-integer number. 



On Fri, 26 Nov 2004, DrBob wrote:

> It can be solved and plotted for some values of the parameters.
> 
> For instance:
> 
> Clear[x, y]
> Block[{a = 3,
>   b = 2, c = 1, d = 4, equation = Log[y/a] + b*Log[c + y/d] == -x},
>      Solve[equation, y]
>      ];
> y[x_] = y /. First@%
> Plot[y@x, {x, -25, 10}]
> 
> Bobby
> 
> On Fri, 26 Nov 2004 01:04:27 -0500 (EST), B.Ravinder <ravi at crest.ernet.in> 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
> > 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
> >
> >
> >
> >
> 
> 
> 
> 


  • Prev by Date: a bug in many variables integration ?
  • Next by Date: Re: How to prevent from simplification?
  • Previous by thread: Re: Non-algebraic solution
  • Next by thread: Re: Re: Non-algebraic solution