Basic

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Basic Characteristics | u b. _ |

`u b. y` gives the obverse of`u` if`y` is`_1`;`` its ranks if`y` is`0`;`` and its identity function if`y` is`1` . |  |

For example:

       ^ b. _1
    ^.

       ^ b. 0
    0 0 0

       ^ b. 1
    $&1@(}.@$)

       g=: +&2@(*&3@*:)
       ]y=: g 5
    77

       g ^:_1 y
    5

       g b. _1
    %:@(%&3)@(-&2)

       %:@(%&3)@(-&2) y
    5

       g b. 0
    0 0 0

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