Use a Schwartzian transform

To sort lists of nine elements, applying the ST is probably counterproductive. And anyway, for that particular problem, using a Orcish Maneuver would be more suitable: 

my @index_sorted = map {
  my @row = splice @sim, 0, N;
  sort { $row[$b] <=> $row[$a] } 0..(N-1);
} 0..(M-1);

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In reply to Re^2: Sorting Index of An Array by salva
in thread Sorting Index of An Array by neversaint

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