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   x←1e5 3⍴⊂⍬
   x[;1]←u[?1e5⍴≢u←' '~¨⍨↓⎕nl 2 3]
   x[;2]←15+?1e5⍴60
   x[;3]←?1e5⍴2e9
   3↑x    ⍝ x is a relational matrix
┌───────────────┬──┬──────────┐
│s              │41│196549161 │
├───────────────┼──┼──────────┤
│ben9949        │16│1426044578│
├───────────────┼──┼──────────┤
│rank_transpose2│25│1926599481│
└───────────────┴──┴──────────┘

   y←x ⋄ y[1;3]←⊂'not a relational matrix'

   cmpx 'x⍳x' 'y⍳y'
 x⍳x → 6.50E¯3 |    0% ⎕⎕⎕                           
 y⍳y → 5.82E¯2 | +795% ⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕⎕