j - Arithmetic mean forwards vs backwards? -


i'm familiar way of doing arithmetic mean in j:

+/ % #

but it's shown here as

# %~ +/

are these 2 versions interchangeable, , if not when should use 1 versus other?

dyadic ~ reverses arguments of verb. x f~ y equivalent y f x. use ~ when you, um, want reverse arguments of verb.

one of common uses forks , hooks composition. example, because y f (g y) (f g) y can use ((f~) g) y when need (g y) f y.


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