Can I assume that the top-level array is what you consider a row, and the array-ref it holds points to an array that you consider to be the columns?

If that's the case, here's an example of deleting a "row".

use strict;
use warnings;
use Data::Dumper;

my @aoa = ( [1, 2, 3],
            [4, 5, 6],
            [7, 8, 9] );
splice @aoa, 1, 1;

print Dumper \@aoa;
[download]

You'll notice that the output of the above snippet indicates that the "row" containing "4, 5, 6" has been deleted. Be sure to see perldoc -f splice for details.