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

*To*: mathgroup at smc.vnet.net*Subject*: [mg109514] Re: Evaluating a sum from terms generated by the Array function*From*: Bill Rowe <readnews at sbcglobal.net>*Date*: Mon, 3 May 2010 06:10:36 -0400 (EDT)

On 5/2/10 at 5:35 AM, davidfrick2003 at yahoo.com (davef) wrote: >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? In[2]:= Plus @@ Array[((-1)^(# + 1) (x)^#)/#! &, 3, 1] Out[2]= x^3/6 - x^2/2 + x or In[3]:= Total@Array[((-1)^(# + 1) (x)^#)/#! &, 3, 1] Out[3]= x^3/6 - x^2/2 + x