j902 does do what seems to make sense though: considering both axes, including the first, are sparse, the boxes should be in a sparse array.
sa=: 1(<1 1)}1$. 2 2;0 01;00 sa 1 1 │ 1 <@(4&$.)"1 sa 1 │ ┌─┐ │ │1│ │ └─┘ $.inv <@(4&$.)"1 sa ┌─┬─┐ │ │1│ └─┴─┘ JVERSION Engine: j902/j32/android Release-a: commercial/2020-12-24T11:35:03 Library: 9.02.08 Platform: Android 32 (armeabi-v7a) Installer: unknown InstallPath: /mnt/sdcard/Android/data/com.jsoftware.j.android/files Contact: www.jsoftware.com I'm a bit baffled by the fact that the sparse element is set as (<0 1$0) though: (<0 1$0) -: 3 $. <@(4&$.)"1 sa 1 But seemingly sparse boxed were not intended to exist in the first place, as one can't seem to create nor amend one: 1 $. 1;0;<a: |nonce error | 1 $.1;0;<a: (<1 2)0} <@(4&$.)"1 sa |nonce error | (<1 2) 0}<@(4&$.)"1 sa Jan-Pieter On Thu, Sep 9, 2021, 16:24 Henry Rich <[email protected]> wrote: > I think you are right. In 6.02 the leading value was also omitted. It > appears that sparse rank, which uses a separate code path, does not > execute the verb on cells that have no non-sparse values. > > It is unlikely that I will work on this any time soon. Please add the > error to the bug list. > > Henry Rich > > On 9/9/2021 3:40 AM, Igor Zhuravlov wrote: > > sa=. 1 (< 1 1)} 1 $. 2 2 ; 0 01 ; 00 > > <@(4&$.)"1 sa > > +-+ > > |1| > > +-+ > > > > Shouldn't be the following result instead?: > > +-+-+ > > | |1| > > +-+-+ > > > > JVERSION > > Engine: j903/j64avx2/linux > > Beta-o: commercial/2021-08-24T19:02:02 > > Library: 9.03.06 > > Qt IDE: 1.9.2/5.9.5(5.12.7) > > Platform: Linux 64 > > Installer: J903 install > > InstallPath: /home/jip/j903 > > Contact: www.jsoftware.com > > > > > -- > This email has been checked for viruses by AVG. > https://www.avg.com > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
