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MathGroup Archive 2003

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Re: Log Equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg44775] Re: Log Equation
  • From: Bill Rowe <readnewscix at mail.earthlink.net>
  • Date: Tue, 25 Nov 2003 00:45:54 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

On 11/24/03 at 12:05 AM, bernard at bouree.net (Bernard BourÃ?e) wrote:

> I 'm trying to find a way to solve the equation

> y = (1-x)/ Log(x)

> How can I find x when y is known ?

Have you tried either NSolve or Solve? With no values assigned to either y or x, you can use

Solve[y==(1-x)/Log@x,x]

which will return

{{x->y ProductLog[Exp[1/y]/y]}}

or with a real value assigned to y you can use

NSolve[y==(1-x)/Log@x,x]
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