I find this confusing and counterintuitive. If displaying an empty vector causes the interpreter to emit a CR, what then becomes of the 0⍴<value> idiom commonly used to suppress display of <value>? Wouldn't your output be littered with spurious CRs every time your program executed such a line?
I spent a half-hour digging through the IBM and ISO references, finding nothing on the subject of display of empty vectors. On Tue, 2014-05-27 at 13:04 -0500, Blake McBride wrote: > a. Neither an empty vector nor a vector of multiple elements has a CR > in it. The system prints the vector, and then prints a CR. CR gets > printed either way. > > > b. I found all these errors while porting my production code which > ran consistently over IBM APL and several other APL's. They all print > a blank line. > > > On Tue, May 27, 2014 at 12:57 PM, David B. Lamkins <da...@lamkins.net> > wrote: > How is that so? '' is an empty vector. > > On Mon, 2014-05-26 at 20:30 -0500, Blake McBride wrote: > > ∇test > > [1] '1' > > [2] ' ' > > [3] '2' > > [4] '' > > [5] '3' > > [6] ∇ > > test > > 1 > > > > 2 > > 3 > > > > > > > > > > There should be a blank line between 2 and 3. > > > > > > Thanks. > > > > > > Blake > > > > > > > >
