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Re: Newbie Question: Solving for x?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg40697] Re: Newbie Question: Solving for x?
  • From: "Dr. Wolfgang Hintze" <weh at snafu.de>
  • Date: Mon, 14 Apr 2003 04:01:07 -0400 (EDT)
  • References: <b7avu5$qpi$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

In order to invert an equation of the form

y = f(x)

You should try Solve and write

Solve[y - f[x] == 0, x]

In my version 4.0.0.0 on W98 the following works:

\!\(Solve[y - \[ExponentialE]\^\(\(-x\^2\)\/2\)\/\@\(2  \[Pi]\) == 0, x]\)

Regards,
Wolfgang

AngleWyrm wrote:

> I have a formula expressing y in terms of x:
> 
> \!\(y = \[ExponentialE]\^\(\(-x\^2\)\/2\)\/\@\(2  \[Pi]\)\)
> 
> How do you make it so that it expresses x in terms of y?
> 
> 
> 



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