From: Mathieu Bouchard <matju@...>
Date: 2005-03-27T11:12:55+09:00
Subject: Re: Convert a Hash into an Array


On Fri, 18 Mar 2005, Phrogz wrote:
> Aside - whatever the name, what an excellent, versatile function! For
> example, the linked-to geometric series sum at
> http://www.brpreiss.com/books/opus8/programs/pgm02_06.txt can be
> written in a more terse and (IMO) more ruby-esque way as simply:
> def geometric_series_sum( x, n )
> 	(0..n).inject(0){ |sum,i| sum+x**i }
> end

And even shorter,

def geometric_series_sum(x,n) (x**(n+1)-1)/(x-1) end

_____________________________________________________________________
Mathieu Bouchard -=- Montr�al QC Canada -=- http://artengine.ca/matju