I asked this question almost three years ago, when I was first starting. Almost the same people answered it, and quite at length, too!
If you want some explanations on the options of composing using the 'cap' ([:) or the compose (@) you can look here: http://jsoftware.com/pipermail/programming/2010-February/018214.html search using "composing without forking (% +/ %)" Unfortunately it is not too easy to search old mails. It is probably also worth understanding the "under" verb, and why resistances in parallel are the same concept as "sumation *under* inversion" , given by (+/ &.: %) The differences between @ and @:, and also between &. and &.: have to do with rank, I leave their explanation, should you need it, to those more elegant than I On 14 October 2012 00:11, Ric Sherlock <[email protected]> wrote: > To turn your phase in to a tacit verb you could do > p=: [: % [: +/ % > Or > p=: %@:(+/@:%) > Or as already suggested in this thread > p=: +/&.:% > On Oct 14, 2012 11:55 AM, "Keith Park" <[email protected]> wrote: > > > To find the value of resistors in parallel one takes the reciprocal of > the > > sum of the reciprocals. So I would like to write a verb to do just > > that. *pr=:%+/% > > *But that, of course, doesn't work. So my question is "is there a way > > of avoiding unwanted hooks and forks?" > > > > On Fri, Oct 5, 2012 at 8:20 AM, Keith Park <[email protected]> wrote: > > > > > Thanks! > > > > > > > > > On Thu, Oct 4, 2012 at 10:14 PM, Raul Miller <[email protected] > > >wrote: > > > > > >> In the sentence: > > >> > > >> +/&.:% resistances > > >> > > >> the phrase +/&.:% is a verb which finds parallel resistance. > > >> > > >> -- > > >> Raul > > >> > > >> On Thu, Oct 4, 2012 at 9:19 PM, Keith Park <[email protected]> wrote: > > >> > To parallel a number of resistors the expression * %+/% *does the > > job. > > >> > How could one make an equivalent verb? > > >> > > > >> > On Wed, Sep 26, 2012 at 12:38 PM, Boyko Bantchev <[email protected] > > > > >> wrote: > > >> > > > >> >> On 26 September 2012 15:39, Henry Rich <[email protected]> > wrote: > > >> >> > +&.% is the operation for combining parallel electrical > > resistances, > > >> >> another > > >> >> > example that immediately demonstrates the associativity. > > >> >> > > >> >> Indeed! I had the vague feeling I know this formula from somewhere > > >> >> else but it evaded me where. > > >> >> > > >> >> > (w:h) ................. > > >> >> > > >> >> The above is a mistake, of course. I should have said h:w, or > place > > >> >> rectangles one above the other instead. > > >> >> > > ---------------------------------------------------------------------- > > >> >> 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 > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
