>> << Ndx Usr Pri Phr Dic Rel Voc !: wd Help Dictionary

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

>> << Ndx Usr Pri Phr Dic Rel Voc !: wd Help Dictionary