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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                     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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