Monad-Dyad

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Monad / Dyad | u : v _ _ _ |

The first argument specifies the monadic case and the second argument the dyadic case.

For example:

       y=: 10 64 100
       ^. y                        NB. Natural logarithm
    2.30259 4.15888 4.60517

       10&^. y                     NB. Base ten logarithm
    1 1.80618 2

       log=: 10&^. : ^.
       log y
    1 1.80618 2

       8 log y
    1.10731 2 2.21462

       (^1) log y
    2.30259 4.15888 4.60517

       LOG=: 10&$: : ^.            NB. Use of self-reference
       LOG y
    1 1.80618 2

       f=: %: : ($:@-)

       (f y),: 100 f y
    3.16228 8 10
    9.48683 6  0

       ABS=: | : [:

       ABS _4
    4

       3 ABS _4
    |valence error: ABS
    |   3     ABS _4

The domain of the dyad`ABS` is empty because the domain of`[:` is empty.

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