From: "Jan E." Date: 2012-04-24T22:16:21+09:00 Subject: Re: problem with SystemStackError Hi, It seems to be a memory limitation of IRB. When I replace a.size (i. e. 162_000) with a smaller number like 130_000, it does work. Anyway, I have no idea what you are trying to do. IRB certainly isn't meant for displaying a gigantic number of arrays (and your code is rather inefficient, because you're are creating lots of unneccessary temporary arrays). -- Posted via http://www.ruby-forum.com/.