From: Nanyang Zhan <sxain@...>
Date: 2008-01-10T19:16:24+09:00
Subject: Re: method that generate block?

> I mean this:
> n = vds.size
> dss = []
> vds[0].each do |d0|
>     vds[1].each do |d1|
>         ...
>             vds[n].each do |dn|
>                 dss << [d0, d1, ... , dn]
>             end
>         ...
>     end
> end


OK, now I know I just need a cartesian product method and I've got one 
from http://www.ruby-forum.com/topic/95519#615075 :

  def cart_prod( *args )
    args.inject([[]]){|old,lst|
      new = []
      lst.each{|e| new += old.map{|c| c.dup << e }}
      new
    }
  end

The problem is this method take arrays as argument, how can I pass into 
only one array as argument? (this one array will contains sub arrays 
that I want to make a cartesian product from, for example: vds = 
[[1,2],["a","b"]], how to pass the vds array into the method to get 
cartesian product of  [1,2] and ["a","b"]?)

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