Op 07-12-17 om 18:27 schreef Jose Mario Quintana:
I really do not know exactly what the original was doing, or what the task
really is, but if the issue was that negative indices are valid for { then
replacing it by (- (_ * 0 > ]))@:[ { ] should do the trick.
kind of, so forcing the index to plus infinite will do the job:
((1+0&{::);((+_*0>])@([+{);>:@{`[`]})&>/@}.) ::]^:(_) 0;0;0 _2 0 0
┌─┬─┬────────┐
│3│_│2 _1 0 0│
└─┴─┴────────┘
Moreover,
counting the jumps in this context seems to be the number of the resulting
items minus one; thus,
no, not for this task. It destroys my J session. So I need a counter.
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