There was some relevant discussion in comp.lang.apl here: https://groups.google.com/forum/#!topic/comp.lang.apl/23LrwRZKmPs
On 6 July 2016 at 19:31, Xiao-Yong Jin <jinxiaoy...@gmail.com> wrote: > The following from GNU APL, > > (⊂[1]⍳2 3)+.+.+⊂[1]10×⍳2 3 > 209 198 > (⊂[1]⍳2 3)(+.+).+⊂[1]10×⍳2 3 > 209 198 > (⊂[1]⍳2 3)+.(+.+)⊂[1]10×⍳2 3 > 33 66 66 66 > > do not agree with Dyalog APL, > > ⎕ML > 3 > (⊂[1]⍳2 3)+.+.+⊂[1]10×⍳2 3 > 165 242 > (⊂[1]⍳2 3)(+.+).+⊂[1]10×⍳2 3 > 165 242 > (⊂[1]⍳2 3)+.(+.+)⊂[1]10×⍳2 3 > 99 132 > > I’m not sure which one is at fault here. Any idea? >
