Sparse arrays have a default value: 0 $. i.3 1 │ 1 2 │ 2 4 + 0 $. i.3 1 │ 5 2 │ 6 $.inv 4 + 0 $. i.3 4 5 6
... which seems to be leaking in here. Thinking about that, I am sort of surprised that my variant does not suffer from this same issue. Thanks, -- Raul On Thu, Nov 9, 2017 at 1:54 PM, robert therriault <[email protected]> wrote: > Well I thought I had a prettier version. > > numeric1=:(0 -: {:)@:(0 # ,) > numeric1 'a' > 0 > numeric1 4 5 $ 'a' > 0 > numeric1 i. 4 5 > 1 > numeric1 x: i. 4 5 > 1 > > But then Raul's example of sparse arrays failed > > numeric1 4+0 $.i.3 > 0 > > The first part seemed to work as expected > (0#,) 4+0 $.i.3 > $(0#,) 4+0 $.i.3 > 0 > > So I assigned it to a variable which looked empty as expected... > t=.(0#,) 4+0 $.i.3 > t > $t > 0 > > but then this! > > {:t > 4 > > Anyone know how an empty list can have a last item? > > Confused, bob > >> On Nov 9, 2017, at 10:15 AM, Raul Miller <[email protected]> wrote: >> >> isnumeric 4+0 $.i.3 > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
