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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: array slices
References: <3EC0494F.A7D67AA4@bellsouth.net>
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> a : array(1..4) of integer;
> c : array( 1..2, 1..4 ) of integer;
>   a(1..4) := c(1)(1..4);
There are two problems here.  1) you can only take slices of one
dimensional arrays (yes, that is annoying).  2) A and C are of different
(anonymous) types so the compiler will point that out if you try to assign
a chunk of one to the other.
  If you do
type Rows is array(1 .. 4) of integer;
a : Rows;
c : array(1 .. 2) of Rows;
then any of
 a(1 .. 4) := c(1)(1 .. 4);
 a := c(1);
 a(3 .. 4) := c(2)(1 .. 2);
are ok.

or
type Rows is array(integer range <>) of integer;
a : Rows(1 .. 4);
c : array(1 .. 2) of Rows(1 .. 4);
d : array(5 .. 6) of Rows(11 .. 25);
a(1 .. 2) := d(6)(11 .. 12);
will also work.