Or, more simply 22j10*^j.o.15%180 18.6622j15.3533
That said, you could also use J's notation for entering complex numbers using polar coordinates 22j10*1ad15 18.6622j15.3533 I hope this makes sense, -- Raul On Thu, Dec 7, 2023 at 12:20 PM Henry Rich <henryhr...@gmail.com> wrote: > > 22j10 (* ^@:j.@:o.&(%&180)) 15 > 18.6622j15.3533 > > Make the middle part a named verb if you like. > > Henry Rich > > On 12/7/2023 11:48 AM, 'PMA' via Programming wrote: > > A slightly different approach. Rather than search out all alignments > > and then deduce their degrees of rotation, I mean now to specify as > > input the degrees for which rotations are to be generated. > > > > Example: given a graph of one dot -- 22j10 -- I'd input that value > > with a rotation choice -- 15 degrees counterclockwise -- and expect a > > single integer-rounded output value of approximately 19j15. > > (Those two "15"s are coincidental.) > > > > My question is, what J syntax will generate that output? > > > > Thanks again for your consideration! > > Peter A > > > > > > On 11/16/23 09:26, Henry Rich wrote: > >> This is my reply to a question someone posed yesterday. This > >> afternoon I will post a complete solution. It's like the puzzle > >> problems I posed you, but just a little longer and comes from a real > >> user need. If you want to solve it yourself you will need the > >> primitives > >> > >> j. dyad, / monad, / dyad, ~, -. dyad, ^ monad, | dyad, -, /: dyad, *. > >> monad > >> > >> hhr > >> > >> On 11/15/2023 6:49 PM, Henry Rich wrote: > >>> I would find the angles from each point to each other point, take > >>> modulus(pi/2), concatenate the list with its negative, and sort. > >>> Rotation by each angle produces a new alignment. Only J primitives > >>> are needed. > >>> > >>> Use complex numbers to represent the (x,y) values, and *. to convert > >>> to angles. > >>> > >>> Henry Rich > >>> > >>> On 11/15/2023 5:52 PM, 'PMA' via Wiki wrote: > >>>> > >>>> Dear J-Wiki, > >>>> > >>>> I want to make a script that, given the X/Y values of a 2D > >>>> dot-graph, will rotate the graph around its designated origin, > >>>> looking for instances of 2 or more points coming into new > >>>> horizontal &/or vertical alignment, and at each such instance > >>>> output the full set of current X/Y values (integer-rounded). > >>>> > >>>> Could you point me to the main needed ingredients? > >>>> > >>>> Thanks in advance, > >>>> > >>>> Peter Armstrong > >>>> > >>> > >> > >> ---------------------------------------------------------------------- > >> 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
