@: At

>> << Ndx Usr Pri Phr Dic Rel Voc !: wd Help Dictionary

At | u@:v _ _ _ |

`@:` is equivalent to`@` except that ranks are infinite.

For example:

       x=: 1 2 3 4
       y=: 7 5 3 2
       x */ @: + y                 Applies product over sums to the entire lists
    2016

       x */ @ + y                  Applies product over sums to each item of the list
    8 7 6 6

       + b. 0
    0 0 0

       */ @: + b. 0
    _ _ _

       */ @ + b. 0
    0 0 0

>> << Ndx Usr Pri Phr Dic Rel Voc !: wd Help Dictionary