How to rewrite the halve function in J?

Question

in the J programming language,

-: i. 5 

the above function computes the halves of all integers in [0,4]. Now let's say I'd like to re-write the -: function, just for the fun of it. My best guess so far was

]&%.2

but that doesn't seem to cut it. How do you do it?

Answer 1

%&2    NB. divide by two
0.5&*  NB. multiply by one half

Answer 2

Note that ] % 2: would also work, but to ensure proper grammar you would either want to use that as the definition of a name, or you would want to put the expression in parenthesis.