From: Sander Land <sander.land@...>
Date: 2006-08-02T19:38:10+09:00
Subject: Re: Scientific calculation: get Std.Dev for a integer array

On 8/2/06, Wang Austin-W22255 <xuwang@motorola.com> wrote:
> Hi Ruby Gurus,
>
> Could you please point me how to do some scientific calculation in Ruby:
>
> 1) How to calculate std.dev for an integer array?
> 2) Is there a log() function in Ruby?
>
> Thank you!
> Austin

1) I don't think there's a builtin function for that, so you'll have
to create your own.
You'll probably want to add it to the Array class.
class Array
  def stddev
    # your function here
  end
end

You could also check rubyforge.org, maybe there's a statistics library
available there.

2) Math.log