From: "Marcel Molina Jr." <marcel@...>
Date: 2005-11-23T07:35:54+09:00
Subject: Re: How convert an integer to a bit array

On Wed, Nov 23, 2005 at 07:31:02AM +0900, James Edward Gray II wrote:
> On Nov 22, 2005, at 4:23 PM, Curt Hibbs wrote:
> 
> >Does anyone have a clever way to convert an integer to an array of bit
> >values?
> >
> >For example (using 8 bit integers):
> >
> >0 => [0, 0, 0, 0, 0, 0, 0, 0]
> >1 => [0, 0, 0, 0, 0, 0, 0, 1]
> >2 => [0, 0, 0, 0, 0, 0, 1, 0]
> >7 => [0, 0, 0, 0, 0, 1, 1, 1]
> >etc.
> >
> >I was looking at Array#pack and Array#unpack to do this, but  
> >haven't figured
> >it out yet. It just seems like there ought to be a simple way to do  
> >this.
> >
> >Anybody got a clever idea?
> 
> Does this help?
> 
> >> ("%b" % 5).split("").map { |n| n.to_i }
> => [1, 0, 1]

An alternative to ('%b' % n) is n.to_s(2)

marcel
-- 
Marcel Molina Jr. <marcel@vernix.org>