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assigning functions

• To: mathgroup at smc.vnet.net
• Subject: [mg56204] assigning functions
• From: juejung <juejung at indiana.edu>
• Date: Tue, 19 Apr 2005 04:55:01 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

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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