Sorting & Searching: Retained Hash Tables Index   <<   >>

 
   a←(⎕a,⎕d)[?1e4 12⍴36]
   g←a∘{(↓⍺)⍳↓⍵}

   b ←a[?5000⍴1↑⍴a;]
   (g b)≡a matiota b
1
   cmpx 'g b' 'a matiota b'
  g b          → 1.55E¯3 |   0% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
  a matiota b  → 2.93E¯3 | +88% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕

   b1←a[?10⍴1↑⍴a;]
   (g b1)≡a matiota b1
1
   cmpx 'g b1' 'a matiota b1'
  g b1         → 0.00E0  |       0%
  a matiota b1 → 1.40E¯3 | +287400% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕