Re: symbolic and indefinite differentiation
- To: mathgroup at smc.vnet.net
- Subject: [mg35415] Re: symbolic and indefinite differentiation
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Fri, 12 Jul 2002 04:28:24 -0400 (EDT)
- Organization: Universitaet Leipzig
- References: <agjj4k$253$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
expr = Sum[a[k]*x^k, {k, 1, p}];
D[expr, x] /. HoldPattern[Sum[a_, b__]] :> Sum[Evaluate[a], b]
???
Regards
Jens
Philippe Huber wrote:
>
> Hello,
>
> I have a dummy question: I would like to know if it is possible (and how) to
> differentiate a symbolic sum like
>
> f(x1,...,xn)=Sum[x^2[[k]],{k,1,p}]
>
> with respect to xi. I should obtain 2xi.
>
> Thank you for your help
>
> Philippe