For starters, when you refer to a single element of an array use a starting $ not an @. Then use separate brackets for each dimension, more like this: 
$sbox[$i][$j] = $input[$y]

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Also, you might try Data::Dumper which will show you your structures: 
use Data::Dumper;
Dumper( \@array );

[download]

Phil

In reply to Re: 2d array problems by philcrow
in thread 2d array problem: unexpected output by punklrokk

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