I can reproduce your result here on my beta-7: {: (0 # ,) 3 + 0 $. 4 + i.3 3 {. (0 # ,) 3 + 0 $. 4 + i.3 3 {. (0 {. ,) 3 + 0 $. 4 + i.3 3 {. (0 {. ,) 3 + 0 $. i.3 3
This does, though, give us a way of satisfying people who wanted a mechanism for specifying the fill value for an array. That said, playing with this, I found a way of crashing J: (,: 0 $. i.)@>3 4 FYI, -- Raul On Thu, Nov 9, 2017 at 9:50 PM, robert therriault <bobtherria...@mac.com> wrote: > Raul, > > You have a newer beta than I do? Is there no end to your wizardry! > > But, I see the same thing now that I am updated to the commercial version of > j806 > > JVERSION > Engine: j806/j64/darwin > Release: commercial/2017-11-06T10:20:33 > Library: 8.06.09 > Platform: Darwin 64 > Installer: J806 install > InstallPath: /users/bobtherriault/j64-806 > Contact: www.jsoftware.com > numeric=: 0 = 0 {.@{. , > numeric 4+0 $.i.3 > 0 > numericM=: monad : '0 -: 0{ , 1{. 0#y' > numericM 4+0 $.i.3 > 0 > > But then I noticed something that I hadn't known about sparse arrays and > their sparse characters > > numeric 0 $. 4 + i.3 > 1 > numericM 0 $. 4 + i.3 > 1 > 3 $. 0 $. 4 + i.3 NB. Sparse character displayed using 3 $. y is 0 after > sparse array is first created > 0 > 3 $. 3 + 0 $. 4 + i.3 NB. Sparse character changes if entire array is > changed later > 3 > (0 # ,) 3 + 0 $. 4 + i.3 NB. Empty > {: (0 # ,) 3 + 0 $. 4 + i.3 NB. result comes from updated sparse character > 3 > > I think that this is what breaks numeric and numericM, but there is always > more to know > > s=: (0 # ,) 3 + 0 $. 4 + i.3 > s NB. Empty array > {:s NB. now we know the 3 comes from the sparse character > 3 > (1,{:) s NB. makes sense > 1 3 > (1,{.) s NB. turns out first of empty is sparse character as well > 1 3 > s -: 0$0 NB. s is empty, right? > 1 > ((0$0),{.) s NB. empty and integer is list > 3 > (s,{.) s NB. this displays like 0 $ 0 > $(s,{.) s NB. but has a shape of 1 > 1 > > It turns out it this is what an empty sparse array looks like. It has zero > non-sparse entries. > > > Cheers, bob > > >> On Nov 9, 2017, at 12:56 PM, Raul Miller <rauldmil...@gmail.com> wrote: >> >> I'm using Beta-7, where you are using Beta-6. >> >> That might be the issue? > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm