Re: assigning functions
- To: mathgroup at smc.vnet.net
- Subject: [mg56229] Re: [mg56204] assigning functions
- From: "Jaccard Florian" <Florian.Jaccard at he-arc.ch>
- Date: Wed, 20 Apr 2005 05:29:59 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hello ! First way : fprime[x_] = D[f[x], x] Works fine... Or : fprime[x_] := Evaluate[D[f[x], x]] But you can also just write f'[2] ! Regards F.Jaccard -----Message d'origine----- De : juejung [mailto:juejung at indiana.edu] Envoyé : mardi, 19. avril 2005 10:55 À : mathgroup at smc.vnet.net Objet : [mg56204] assigning functions 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