Tetration (I think it is called) is an impressive display of dyadic (m&)
You are allowed to keep adding (&m) bindings. As a hybrid depth/breadth first (do depth 10 times in a breadth way), then 10 x&search^:(until)^:_ y lets you make that chunk size a verb parameter. With that said, there is surely a way to box x, and extract items from it on the v side of ^:, but then you need to include a 1 result in the relevant x position and set a maximum possible "exponentiation/tetration" level. While I certainly admit that in the life of a J programmer, you will more often accidentally call a bound (&) verb dyadically on accident rather than on purpose, which often results in infinitish loop hang/delays, it hasn't happened to me in a while, so I'm somehow hopeful that it this construct could still be more useful than my future accidents probabilities. On Monday, August 17, 2020, 10:21:05 a.m. EDT, Henry Rich <henryhr...@gmail.com> wrote: On the current implementation it is much preferable to use bitmask operator@]^:["0 operand rather than bitmask 0&(] operator)"0 operand They both execute at low rank, but the second version reinterprets the internal form ( 0&(] operator)^:bitmask ) for each atom. I have yet to find an application where (x m&v y) is needed. Does anyone have one? In the example above, the 0& could be any value and is used only as a way of getting the power function. Henry Rich On 8/17/2020 9:30 AM, David Lambert wrote: > Yes, thank you Roger for this explanation of dyadic & which i've recently > been thinking about how to incorporate into my j programming. > > |Date: Sun, 16 Aug 2020 21:00:42 +0000 (UTC) > |From: "'Pascal Jasmin' via Programming" <programm...@jsoftware.com> > |To: "programm...@jsoftware.com" <programm...@jsoftware.com> > |Subject: Re: [Jprogramming] conditional application defined by bitmask > |Message-ID: <316224114.2834748.1597611642...@mail.yahoo.com> > |Content-Type: text/plain; charset=UTF-8 > | > |Roger's solution includes an intermediate-advanced J concept I knew about, > and an advanced realization I did not previously realize/know about. > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- This email has been checked for viruses by AVG. https://www.avg.com ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
