Let's do $x[$n[$j]][$j] in bits:
foreach my $j ($col_start .. $#column) {
my $nIndex = $n[$j];
$x[$nIndex][$j] = $column[$j];
$x_tot[$j] += $x[$nIndex][$j];
$n[$j]++;
}
The 'uninitialized value' error can then be fix by:
foreach my $j ($col_start .. $#column) {
my $nIndex = $n[$j] // 0;
$x[$nIndex][$j] = $column[$j];
$x_tot[$j] += $x[$nIndex][$j];
$n[$j]++;
}
Optimising for fewest key strokes only makes sense transmitting to Pluto or beyond
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