Re: How to obtain numberical value from an
- To: mathgroup at smc.vnet.net
- Subject: [mg80944] Re: [mg80916] How to obtain numberical value from an
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 6 Sep 2007 05:22:50 -0400 (EDT)
- Reply-to: hanlonr at cox.net
f[x_] := x; f /: InverseFunction[f] = f; InverseFunction[f][f[x]] x f[InverseFunction[f][x]] x InverseFunction[f][0.5] 0.5 f[x_] := x^2; f /: InverseFunction[f] = Sqrt; InverseFunction[f][f[x]] Sqrt[x^2] f[InverseFunction[f][x]] x InverseFunction[f][4] 2 Bob Hanlon ---- Nasser Abbasi <nma at 12000.org> 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 > >