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MathGroup Archive 2001

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Re: simple Problem: D[ ]

  • To: mathgroup at
  • Subject: [mg27325] Re: simple Problem: D[ ]
  • From: Albert Retey <albert.retey at>
  • Date: Wed, 21 Feb 2001 03:16:56 -0500 (EST)
  • Organization: Visual Analysis AG
  • References: <96t91a$>
  • Sender: owner-wri-mathgroup at

Christian Maier wrote:
> 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


This should do what you want, the colon will cause the left hand side to
evaluated only, when the "pattern" f[x] will be met. For a real
"function definition" with arbitrary argument you should use:


Then even D[f[y],y] should work the way you expect it. Nevertheless, try
to first read some introduction to Mathematica, for a beginning the
first chapter in the online help -> the mathematica book should do.

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