There are some gains to be had. This'll run in about 1/3rd the time of ikegami's version above for 1e6 elements, and proportionally more as the size increases: 

my @sums;
for my $i ( 0 .. $#data ) {
    $sums[ 0 ] += $data[$i][ 0 ];
    $sums[ 1 ] += $data[$i][ 1 ];
    $sums[ 2 ] += $data[$i][ 2 ];
    $sums[ 3 ] += $data[$i][ 3 ];
}
$sums[ $_ ] /= @data for 0 .. 3;

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In reply to Re^2: Averaging Elements in Array of Array by BrowserUk
in thread Averaging Elements in Array of Array by neversaint

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