⍤
) operatorThe Atop operator is new way to write 2-trains.
A 2-train is evaluated like a 3-train with the central function's left argument removed.
If passed only one argument, an atop (g h)
or g⍤h
is identical to g∘h
.
⊃⍤⌽
picks element ⍺
from ⍵
's first row, or the last if called monadically.f⍤⊣
or f⍤⊢
to apply a function f
to only the left or right argument within a train.⊢⍤/
for Compress if plain /
is treated as an operator.