1\par
2\chapter{{\tt A2}: Real or complex 2-D array}
3\par
4The {\tt A2} object is one way to store and operate on and
5with a dense matrix.
6The matrix can contain either double precision real or complex
7entries.
8It is used as a lower level object for the {\tt DenseMtx} object,
9and during the $QR$ factorization to hold a staircase matrix.
10\par
11