From: "Mauricio Fernández" <batsman.geo@...>
Date: 2004-04-23T16:15:53+09:00
Subject: Re: log base 2 and floats that don't look it

On Fri, Apr 23, 2004 at 03:54:10PM +0900, Phil Tomson wrote:
> 2 things:
> 
> 1) Why isn't there a log base 2 function in the standard Math library?  
> Seems pretty essential.

>> module Math; def log2(x); log(x)/log(2) end; module_function :log2 end
=> Math
>> (0..10).map{|x| 2 ** x}.map{|x| Math.log2(x)}
=> [0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0]


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