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Re: Evaluating a sum from terms generated by the Array function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg109512] Re: Evaluating a sum from terms generated by the Array function
  • From: "Nasser M. Abbasi" <nma at 12000.org>
  • Date: Mon, 3 May 2010 06:10:14 -0400 (EDT)
  • References: <hrjh0l$bg8$1@smc.vnet.net>

"davef" <davidfrick2003 at yahoo.com> wrote in message 
news:hrjh0l$bg8$1 at smc.vnet.net...
>I want to evaluate a sum from a series I created using the Array
> function.
>
> For example; I specify
>
> Array[((-1)^(# + 1) (x)^#)/# ! &, 3, 1 ]
>
> which gives me the following 3 terms of output:
>
> {x, -(x^2/2), x^3/6}
>
> Can anyone tell if and how I can turn these 3 terms into a sum to be
> evaluated?
>

may be use Total[]?

v = Array[((-1)^(#1 + 1)*x^#1)/#1! & , 3, 1];
Total[v] /. x -> 3.14

3.370057333333333

--Nasser




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