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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
>
>
>