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Infinity _:  _ _ _ Infinity

_: is a constant function that yields an infinite result, that is, _: y is _
 
  _: is a constant function that yields an infinite result, that is, x _: y is _
 

For example:
   y=: 1 2 3 4
   _: y
_

   _:"0 y                     NB. Rank zero applies to each element
_ _ _ _
Other constant functions include _9: and _8: etc. to 9: . More generally, the expression x"r defines a constant function of rank r that yields the constant value x . For example:
   3.14"0 y
3.14 3.14 3.14 3.14

   3.14"1 y
3.14
The specific constant functions mentioned can therefore be written alternatively as _"_ and _9"_ and 0"_ and 9"_ , etc.



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