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x ⍳ y   x and/or   y are floats (real or complex)
 
1 < ×/1↓⍴x major cells have multiple elements
 
⎕ct≠0 tolerant comparison
 


   x ← 0.5 + ? 1000 3 ⍴ 12
   y ← 0.5 + ? 1000 3 ⍴ 12

   ix0 ← {⎕ct←0 ⋄ ⍺⍳⍵}

   )copy dfns cmpx

   cmpx 'x ix0 y' 'x⍳y'
  x ix0 y → 3.91E¯5 |      0%                               
  x⍳y     → 1.26E¯2 | +32140% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕