Re: simple Problem: D[ ]

*To*: mathgroup at smc.vnet.net*Subject*: [mg27344] Re: simple Problem: D[ ]*From*: "Seth Chandler" <SChandler at Central.UH.Edu>*Date*: Wed, 21 Feb 2001 03:17:28 -0500 (EST)*Organization*: University of Houston*References*: <96t91a$pqt@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

You are not defining your function properly. You should write: f[x_]=x^2. (You need the underscore character). I think you would be helped by reading some basic material on Mathematica such as section 1.7.1 of the Wolfram book. Seth J. Chandler "Christian Maier" <maier1 at sbox.tu-graz.ac.at> wrote in message news:96t91a$pqt at smc.vnet.net... > > I use mathmatica the first time and have a problem with a deriviation: > > in a simple problem: > > f[x]=x^2 > abl=D[f[x],x] > > then Mathematica puts out f[x]' , but not 2 x > > How does it work correctly? > Thank aou in advance! > > Christian Maier > > >