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July 15, 2016 / jphoward

Quickref for J compounds

Compound Form Result
hook (g h) y y g (h y)
x (g h) y x g (h y)
fork (f g h) y (f y) g (h y)
x (f g h) y (x f y) g (x h y)
cap ([: g h) y g (h y)
x ([: g h) y g (x h y)
atop u@v y u (v y)
x u@v y u (x v y)
at @: as atop, but infinite rank
compose u&v y u (v y)
NB. Same as atop(@)
x u&v y (v x) u (v y)
appose &: as compose, but infinite rank
under u&.v y vi u v y
NB. vi is obverse (b. _1) of v
x u&.v y vi (vx) u (v y)
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