From: Joel VanderWerf <vjoel@...>
Date: 2009-06-18T07:44:48+09:00
Subject: Re: new-b question

David Newton wrote:
> I am trying to calculate a 5 day weighted moving average based on a set
> of numbers in a data series. The most recent is given a * 5 weight, the
> next * 4 etc etc. with the oldest (the 5th number) * 1.

Does this help? You will need to handle the edge cases somehow...

$ ri Enumerable#each_cons | cat
--------------------------------------------------- Enumerable#each_cons
      each_cons(n) {...}

      From Ruby 1.8
------------------------------------------------------------------------
      Iterates the given block for each array of consecutive <n>
      elements.

      e.g.:

          (1..10).each_cons(3) {|a| p a}
          # outputs below
          [1, 2, 3]
          [2, 3, 4]
          [3, 4, 5]
          [4, 5, 6]
          [5, 6, 7]
          [6, 7, 8]
          [7, 8, 9]
          [8, 9, 10]

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407