Index-of & Co. II Index   <<   >>


 
   tix ← 8⌶      ⍝ 8 ←→ IIX ←→ Inverted Table IndeX-of  

   T tix S
3 1 1 2

   cmpx 'TT tix  TT' 'TT tix1 TT' 'XX ⍳ XX'
  TT tix  TT → 9.38E¯4 |    0% ⎕⎕⎕⎕⎕⎕⎕
  TT tix1 TT → 4.27E¯3 | +355% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕
  XX ⍳ XX    → 1.61E¯3 |  +71% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕

   QQ←XX ⋄ QQ[9999;]←34  ⍝ QQ is a general nested matrix

   cmpx 'TT tix TT ' 'XX ⍳ XX' 'QQ ⍳ QQ'
  TT tix TT  → 9.34E¯4 |     0% ⎕⎕⎕
  XX ⍳ XX    → 1.61E¯3 |   +71% ⎕⎕⎕⎕⎕
* QQ ⍳ QQ    → 1.03E¯2 | +1004% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕