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Halve -:  0 _ _ Match

-:y is one half of y . For example:
   -: i. 5
0 0.5 1 1.5 2
  x -: y yields 1 if its arguments match: in shapes, boxing, and elements; but using tolerant comparison. See Equal (=).

Matching with a tolerance t can be obtained using the verb -: !. t .
 

For example:
   x=: 0 1 2 3 4 5
   ,.&.> (] ; -: ; +:@-: ; (%&2) ; (2: %~ ])) x
+-+---+-+---+---+
|0|  0|0|  0|  0|
|1|0.5|1|0.5|0.5|
|2|  1|2|  1|  1|
|3|1.5|3|1.5|1.5|
|4|  2|4|  2|  2|
|5|2.5|5|2.5|2.5|
+-+---+-+---+---+
      
   x = +: -: x
1 1 1 1 1 1

   x -: +: -: x
1



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