I've used (0"0) a few times to make an empty array a given shape (usually followed by an invocation of }). However, (0$~$) is not much longer and I find that it better explains what I am trying to do.
Marshall On Sun, Aug 09, 2015 at 02:45:11PM -0400, Raul Miller wrote: > Conciseness? > > I guess it's debatable whether constants with non-infinite rank are > more or less common than gerunds which need to conform to the shape of > their (eventual) verb argument. > > Perhaps it would be worthwhile collecting useful examples of each? I > know I've used low-rank constants within the last few years, but at > the moment I do not remember where... > > Thanks, > > -- > Raul > > > On Sun, Aug 9, 2015 at 2:03 PM, Jose Mario Quintana > <[email protected]> wrote: > > A constant verb (with rank _) can be produced easily via &[. For example, > > > > (1 2 3 &[) _ > > 1 2 3 > > > > and it could be followed by a suitable rank (") form if necessary. Am I > > missing something? > > > > > > On Sun, Aug 9, 2015 at 9:20 AM, Henry Rich <[email protected]> wrote: > > > >> All the partitioning modifiers (\ /. \. ;. etc) allow u to be a gerund > >> that is applied cyclically to the partitions. Thus, +`-/. applies + and - > >> alternately. > >> > >> All the modifiers, that is, except one. The simplest one. One that > >> perhaps wasn't thought of as partitioning, though it clearly does. It > >> partitions the y argument into cells. > >> > >> If m"n had been defined consistently with the other partitioning > >> modifiers, we would be able to write +`-"_1 to have different verbs applied > >> to items. This would have saved dozens of emails over the years searching > >> for a good way to perform this often-needed operation. > >> > >> The constant-verb would have to move somewhere else: m&n, m@n, and many > >> other places are free. > >> > >> For the next language. > >> > >> Henry Rich > >> ---------------------------------------------------------------------- > >> For information about J forums see http://www.jsoftware.com/forums.htm > >> > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
