>>>>> In <ngekbkd--...@tutamail.com> >>>>> "'Viktor Grigorov' via Programming" <programm...@jsoftware.com> wrote:
> Why does > (|. &. ,) i.3 3 > result in a domain error (likewise with &.:), while > ($ $ (|. @ ,) ) i.3 3 > doesn't? The domain error is raised by ,^:_1 and as in J and APL the inverse of ravel is not defined in present time. This is not the first time people asking about this feature and the APL community have given this a name "structural under" https://www.dyalog.com/blog/2023/01/structural-vs-mathematical-under/ >> ... an important reason was that Roger Hui wasn’t a big fan of the >> proposed extension known as “structural under” ldbeth ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
