[Tutor] Summing arrays

[Wolfgang Maier]

On 03/16/2017 10:38 AM, Wolfgang Maier wrote:
>
> In addition, I'd agree with Alan that the advantage of using numpy
> functionality in this function seems quite questionable. You'd probably
> get pretty much the same performance with just:
>
> def sum2(N):
>     return sum(2*(1+3**(i-1)) for i in range(1,N+1,1))
>

Or, if you really want to leverage the power of numpy (and are willing 
to pay the price of possibly inexact calculations) rewrite your function 
as Peter shows in his reply.