Hi Raul, I really like your approach with the dyadic use of &., and the sneaky subtract and then re-add (very neat), but unfortunately _. doesn't work.
[B=:>:&.>(i.1);(i.3);(i.5)
open=:4 :'x+>y-&.>x'
_. open B
so back to this (I'll make a verb out of it).
max=.>./#&> B
max&({.!._.)&> B
thanks,
-Steven
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