I understand now I was just defining a verb and applying it twice in the first case.
Thanks everyone. ________________________________ From: Programming <programming-boun...@forums.jsoftware.com> on behalf of Louis de Forcrand <ol...@bluewin.ch> Sent: Wednesday, November 20, 2019 9:52 PM To: programm...@jsoftware.com <programm...@jsoftware.com> Subject: Re: [Jprogramming] Explicit vs tacit with assignment Just to correct a mistake that I always hate making: "... for use after _its_ application ..." Sorry for the noise, Louis > On 21 Nov 2019, at 03:49, Louis de Forcrand <ol...@bluewin.ch> wrote: > > (a,a=.?@#) is a verb, namely (?@# , ?@#). In this expression a is set to the > _verb_ ?@# and then train (a,a) is evaluated. > > In the second case a is set to the _result_ of ?@# and then (a,a) is > evaluated. To do this tacitly: > > (] , ]) @ (?@#) > > or more concisely > > ,~@?@# > > or equivalently (how I would write it) > > 2 $ ?@# > > As Henry said, to store an intermediate value in a verb's evaluation for use > _after_ it's application, you must use an explicit verb, for example: > > ,~ @ (3 : 'a=: y') @ (?@#) > > Cheers, > Louis > >> On 21 Nov 2019, at 03:26, Nimp O <tr...@outlook.com> wrote: >> >> Hello, simple question. >> >> This behaviour surprised me. >> >> (a,a=.?@#)'01234' >> 2 4 >> >> 3 : 'a,a=.?@#y' '01234' >> 1 1 >> >> Why a is not equal to a in the first case? How can I save the roll as an >> intermediate result in the tacit version? >> Thanks. >> ---------------------------------------------------------------------- >> 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
