From: ara.t.howard@...
Date: 2006-12-03T02:54:01+09:00
Subject: Re: [OT] calculations on lists of numbers

On Sun, 3 Dec 2006, Devin Mullins wrote:

> ara.t.howard@noaa.gov wrote:
>>   harp:~> cat a.rb
> Man, how do you keep all your a.rb's straight?
>
>>   #! /dmsp/reference/bin/ruby
>> 
>>   require 'narray'
>>   require 'yaml'
> Am I blind, or do you require 'yaml' and never use it?

nope.  you are note blind ;-)  it used yaml in the past, but it's rolled by
hand now to presever order...

>>   list = ARGF.readlines.map{|line| line.strip.split(%r/\s+/).map{|f| Float 
>> f}}.flatten
> Doesn't this load the whole list of numbers into memory? (i.e. how does it 
> fare on "a billion values"?

yes.  badly.  most of our machines have 8gb of ram though - so i can ignore
this for most of our stuff ;-)  mostly this is a small hack which levrages the
power of narray.

regards.

-a
-- 
if you want others to be happy, practice compassion.
if you want to be happy, practice compassion.  -- the dalai lama