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MathGroup Archive 2002

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Re: symbolic and indefinite differentiation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35450] Re: symbolic and indefinite differentiation
  • From: Francois Coppex <francoiscoppex at hotmail.com>
  • Date: Sat, 13 Jul 2002 03:48:21 -0400 (EDT)
  • References: <agjj4k$253$1@smc.vnet.net> <agm431$58n$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

> expr = Sum[a[k]*x^k, {k, 1, p}];
> D[expr, x] /. HoldPattern[Sum[a_, b__]] :> Sum[Evaluate[a], b]
>
> ???

I think that what he's trying to do is rather something like

p = 100;
Array[x, p];
f = Sum[x[i]^2, {i, 1, p}];
j = 43;
D[f, x[j]]

but leaving p and j undefined.




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