On Fri, Aug 30, 2013 at 6:20 AM, Anubhab Baksi <anubhab91 at gmail.com> wrote: > I need to deal with nearly 2**19 or 2**20 arrays of length about 250 each. As mentioned elsewhere in this thread: what does "deal" mean. You may be better off with something like: http://kwant-project.org/tinyarray/ Stéfan