Utilities: Dfns Index   <<   >>

 
   avg ← {(+⌿⍵)÷⍬⍴⍴⍵}
   ⎕fx 'z←avg1 x' 'z←(+⌿x)÷⍬⍴⍴x'

   x←(2*¯24)ׯ1e9+?10⍴2e9
   cmpx 'avg x' 'avg1 x'
  avg x  → 2.24E¯6 |   0% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕    
  avg1 x → 2.86E¯6 | +28% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕

   rn←{(2*¯24)ׯ1e9+?⍵⍴2e9}
   {÷/tm cmpx 'avg x' 'avg1 x' ⊣ x←rn ⍵}¨10*1 2 3 4
0.819495 0.824615 0.923944 1