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MathGroup Archive 2005

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Re: assigning functions

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56206] Re: assigning functions
  • From: juejung <juejung at indiana.edu>
  • Date: Tue, 19 Apr 2005 04:55:03 -0400 (EDT)
  • References: <opspforld7yw49cj@juergen>
  • Sender: owner-wri-mathgroup at wolfram.com

sorry, i just found the solution myself. yes, the help file is helpful ;-)

f[x_] := x^2;
fprime[x_] = D[f[x], x]

works just fine!
the "set delayed assignment rule" for the second part was wrong.

best
juergen

On Mon, 18 Apr 2005 10:17:35 -0500, juejung <juejung at indiana.edu> wrote:

> dear all,
>
> i would like to do the following.
> assign a function:
> f[x_] := x^2;
>
> take its derivate:
> D[f[x], x]
>
> and assign the result of this to a new function, like fprime[x]:
> fprime[x_] := D[f[x], x]
>
> unfortunately that doesn't work.
> when i try to evaluate fprime[2] i get an error message.
>
> can somebody please help, this haunts me for a while now.
>
> thanks and all the best
>
> juergen



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