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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                        Natural logarithm
2.30259 4.15888 4.60517

   10&^. y                     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&$: : ^.            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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