The trick is to realise that there is no such thing as a 2D array in Perl. It's actually an array where the elements are references to a other arrays. Therefore $array_name[2] contains the reference to the array and @{$array_name[2]} gives you the referenced array. To get the size of this array simply evaluate it in a scalar context as always.

$size = @{$array_name[2]};
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You might like to take a look at the perlreftut, perllol and perldsc manual pages for more information.

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<http://www.dave.org.uk>

Perl Training in the UK <http://www.iterative-software.com>