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19. Tacit Equivalents

Verbs may be defined either explicitly or tacitly. In the case of a one-sentence explicit definition, of either a monadic or dyadic case, the corresponding tacit definition may be obtained by using the adverb 13 : as illustrated below. First enter 9!:3 ] 2 5 so as to obtain both the boxed and linear displays of verbs:
   s=: 0 : 0
(+/y) % (#y)
)

   mean=: 3 : s
   MEAN=: 13 : s

   mean                           MEAN
+-+-+------------+           +-----+-+-+
|3|:|(+/y) % (#y)|           |+-+-+|%|#|
+-+-+------------+           ||+|/|| | |
3 : '(+/y) % (#y)'           |+-+-+| | |
                             +-----+-+-+
                             +/ % #
The explicit form of definition is likely to be more familiar to computer programmers than the tacit form. Translations provided by the adverb 13 : may therefore be helpful in learning tacit programming.

Exercises

19.1   Use the display of the tacit definition of MEAN to define an equivalent function called M .

Answer: M=: +/ % #



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