From: Noah Easterly <noah.easterly@...>
Date: 2007-08-07T01:30:10+09:00
Subject: Re: pulling specific dup. elements out of an array

On Aug 6, 11:08 am, Stefan Rusterholz <apei...@gmx.net> wrote:
> Why do you want to remove the 0 elements for that? They won't influence
> the result:
> avg_kb = array.inject(0.0) { |sum,num| sum + num.to_f
>
> }/array.length/1024

but rejecting the 0 elements will change the length of the array,
and change the resulting average.  It depends on whether you want to
generate
the average across all values or the average across all non-zero
values.

with_zeroes = [ 0, 0, 0, 1.0 ]
without_zeroes = with_zeroes.reject { |x| x == 0 } #=> [ 1.0 ]

with_zeroes.inject { |a,b| a + b } / with_zeroes.length #=> 0.25
without_zeroes.inject { |a,b| a + b } / without_zeroes.length #=> 1.0