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