Copying an array or hash into @_ takes time. Passing arrays and hashes by reference is straightforward.
See Benchmark
If you want median: 
sub median { $_[0]->[ @{$_[0]} / 2 ] }

my @points = 0..100;

print median(\@points), "\n";

[download]

In reply to Re^3: Calculating statistical median by dirac
in thread Calculating statistical median by Lhamo_rin

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