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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Help needed for ada package
References: <uaaje1d0l4tp1kjs18mkrgfmbkcir308bt@4ax.com>
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Date: Fri, 29 Jul 2005 03:37:15 -0500
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Xref: g2news1.google.com comp.lang.ada:3831
Date: 2005-07-29T03:37:15-05:00
List-Id: <comp.lang.ada>

>   type Association_Matrix is array (Id'First .. Id'Last) of
>Association_Vector;
>   pragma Pack(Association_Matrix);
>   --   1_000_000 rows of 125_000 bytes is 125_000_000_000 bytes
>   --   very fat, 125GB

  Remember that a symmetric array A(1 .. N, 1 .. N) can be stored in half
the space as a vector V(1 .. (N*(N+1))/2), where A(i,j) is at
V((max(i,j)*(max(i,j)-1))/2+min(i,j))