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
> >
> >
> >
> >
>
>
>
>