This sounds like a terminated fold. Something like https://wiki.jsoftware.com/wiki/Vocabulary/fcap#How_should_I_define_u_and_v.3F ... maybe 0 ]F..(_2 Z: f@[) coords
(That said, you probably want to restructure your description a bit so that you can get a useful result from all of this work.) I hope this helps, -- Raul On Fri, Oct 21, 2022 at 12:19 PM Ed Gottsman <edward.j.gotts...@gmail.com> wrote: > > Hi. I’m blanking on something basic and research isn’t helping. When the > blindingly obvious solution is revealed I will blame a combination of sleep > deprivation and senescence. > > I’ve got a long list of coordinates ordered by desirability. I want to > invoke f (a custom script) with each coordinate in turn. f may return 0 > (failure), in which case I want to invoke it again with the next coordinate. > When f (eventually) returns 1, I want to terminate—the remainder of the > coordinates should not be processed. (Note that the very first invocation of > f may return 1.) > > This *almost* feels like ^: in its Do While form. Almost. It also feels > like SCs around list operations (though they seem to be limited to > primitives). > > Help. > > Many thanks. > > Ed > > Sent from my iPad > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
