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Re: How to obtain numberical value from an InverseFunction?

• To: mathgroup at smc.vnet.net
• Subject: [mg80930] Re: How to obtain numberical value from an InverseFunction?
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 6 Sep 2007 05:15:40 -0400 (EDT)
• Organization: Uni Leipzig
• References: <fblkie$sac$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de

Hi,

if Mathematica does not know the inverse function (that may not exist)
that it is up to you define an inverse.

Regards
   Jens

Nasser Abbasi wrote:
> Hello;
> 
> Are inverse function in Mathematica only have symbolic form and can't be 
> used to evaluate numerically?
> 
> Anything I am trying is not working, this is a very simple example:
> 
> f[x_] := x
> InverseFunction[f][x]
> 
> Now, how to evaluate anything out of the above? say for x=0.5, I expected to 
> get .5, but all I get is just
> f(^-1)[x][.5]
> 
> any ideas? Very little help on InverseFunctions.
> 
> Nasser
> 
>