From: "Peña, Botp" <botp@...>
Date: 2008-04-15T16:23:55+09:00
Subject: Re: noob 'why doesn't this work' question

From: Paul [mailto:Paul.McArdles@gmail.com] 
# irb(main):001:0> a = [0,1,2,3,4,5,6]
# => [0, 1, 2, 3, 4, 5, 6]
# irb(main):002:0> b = [3,4,6]
# => [3, 4, 6]
# irb(main):003:0> c = a - b
# => [0, 1, 2, 5]

Hi Paul, the op meant that the array b contains indexes for a (and not contents as in your example)

kind regards -botp