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 > >