In GNU APL, the following two expressions yield the same result: * (+/⍤1) 3 4⍴⍳100* ┏→━━━━━━━┓ ┃10 26 42┃ ┗━━━━━━━━┛
And: * (+/⍤¯1) 3 4⍴⍳100* ┏→━━━━━━━┓ ┃10 26 42┃ ┗━━━━━━━━┛ I would expect the latter to yield the following (which is what I believe Dyalog does): ┏→━━━━━━━━━━┓ ┃15 18 21 24┃ ┗━━━━━━━━━━━┛ Regards, Elias On 6 May 2016 at 21:22, Jay Foad <jay.f...@gmail.com> wrote: > On 6 May 2016 at 13:52, Juergen Sauermann <juergen.sauerm...@t-online.de> > wrote: > > Except maybe for the Dyalog ¯1 case (primarily because I don't know what > > "major cells" are). > > Dyalog treats ¯1 the same as the ISO standard (and therefore also GNU > APL). "Major cell" is explained on page 14 of: > http://docs.dyalog.com/14.1/Dyalog%20APL%20Programmer's%20Guide.pdf > > Jay. >
