Re: Derivative of a sum.
- To: mathgroup at smc.vnet.net
- Subject: [mg101651] Re: Derivative of a sum.
- From: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>
- Date: Sun, 12 Jul 2009 06:57:12 -0400 (EDT)
- References: <email@example.com>
I seem to have some difficulties interpreting your question. Your summing over i but there's now i in the summand, or this (in i) must mean something. And the derivative is with respect to which variable? Cheers -- Sjoerd On Jul 11, 5:25 am, "Muntoni Giampaolo" <muntoni.gia... at alice.it> wrote: > In order to resolve a problem I have found the question of derivating = the > expression e^(-x)*Sum(in i)(x^n/n!, (i,0,n));the solution is easy and is > e^(-x)(x^n/n!). > But using language of Mathematica I have obteined a different result with= a > ricorse of Gamma function...also recurring to the option of manipulate, > changing the value of integer n. > I would want to obtain the exact result with language of Mathematica and > Manipulate respect to n and also plotting the original function and its > derivative.(with manipulate) > Thanks for aids > Giampaolo