access the elements of a 2-dimensional array
Major Section:  ARRAYS

Example Form:
(aref2 'delta1 a i j)

General Form: (aref2 name alist i j)

where name is a symbol, alist is a 2-dimensional array and i and j are legal indices into alist. This function returns the value associated with (i . j) in alist, or else the default value of the array. See arrays for details.

This function executes in virtually constant time if alist is in fact the ``semantic value'' associated with name (see arrays). When it is not, aref2 must do a linear search through alist. In that case the correct answer is returned but a slow array comment is printed to the comment window. See slow-array-warning.