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MathGroup Archive 2002

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Re: symbolic and indefinite differentiation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg35632] Re: symbolic and indefinite differentiation
  • From: "Peltio" <peltio at twilight.zone>
  • Date: Tue, 23 Jul 2002 01:52:01 -0400 (EDT)
  • Organization: Peltio Inc.
  • References: <agjj4k$253$1@smc.vnet.net>
  • Reply-to: "Peltio" <peltioNOSP at Miname.com.invalid>
  • Sender: owner-wri-mathgroup at wolfram.com

"Philippe Huber" ha scritto
>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.

If you mean a term by term differentiation, you could try the Summa package
I uploaded on the mathsource a couple of years ago. It's a very thin and
almost trivial package but it can avoid you typing substitutions rules at
each passage.

http://www.mathsource.com/Content/Enhancements/MathFunctions/0210-508

hope this can be of some help,
regards,
Peltio
peltio at despammed dot com

PS
The address inside the package is no longer valid.




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