4 $.$.=l2 0 0 0 7 1 1 2 2 2 6 3 3 3 5 3 8 4 4 4 9 4 11 5 10
R.E. Boss > -----Oorspronkelijk bericht----- > Van: Programming <[email protected]> > Namens Ric Sherlock > Verzonden: maandag 14 januari 2019 06:15 > Aan: Programming JForum <[email protected]> > Onderwerp: Re: [Jprogramming] Finding indices > > Basically you are seeing the result of monadic = > > l2 > > 5 2 3 4 6 4 3 5 4 6 7 6 > > = l2 > > 1 0 0 0 0 0 0 1 0 0 0 0 > > 0 1 0 0 0 0 0 0 0 0 0 0 > > 0 0 1 0 0 0 1 0 0 0 0 0 > > 0 0 0 1 0 1 0 0 1 0 0 0 > > 0 0 0 0 1 0 0 0 0 1 0 1 > > 0 0 0 0 0 0 0 0 0 0 1 0 > > <@I. = l2 > > ┌───┬─┬───┬─────┬──────┬──┐ > > │0 7│1│2 6│3 5 8│4 9 11│10│ > > └───┴─┴───┴─────┴──────┴──┘ > > > I think you can simplify your Idot to: > Idot=: [: <@I. = > > It would be interesting to understand the actual problem you are trying to > solve with Idot. > > > On Mon, Jan 14, 2019 at 5:56 PM 'Skip Cave' via Programming < > [email protected]> wrote: > > > Ok. You have convinced me to go with the empty box as a null > > indicator. In that case, we can make the Idot verb dyadic, and generalize > > it: > > > > Idot =.[:I.&.>[:{="1 > > > > l1 =. 1 2 3 4 6 4 3 4 4 6 7 6 > > > > 5 Idot l1 > > > > ┌┐ > > > > ││ > > > > └┘ > > > > l2 =. 5 2 3 4 6 4 3 5 4 6 7 6 > > > > 5 Idot l2 > > > > ┌───┐ > > > > │0 7│ > > > > └───┘ > > > > ]m=.|:1 2 3 4,. 2 5 5 5,. 5 4 3 2 ,. 2 3 5 4,. 2 5 4 5 > > > > 1 2 3 4 > > > > 2 5 5 5 > > > > 5 4 3 2 > > > > 2 3 5 4 > > > > 2 5 4 5 > > > > 5 Idot m > > > > ┌┬─────┬─┬─┬───┐ > > > > ││1 2 3│0│2│1 3│ > > > > └┴─────┴─┴─┴───┘ > > > > ]n=.|:2 5 5 5,. 1 2 3 4,. 5 4 3 2 ,. 2 3 5 4,. 2 5 4 5 > > > > 2 5 5 5 > > > > 1 2 3 4 > > > > 5 4 3 2 > > > > 2 3 5 4 > > > > 2 5 4 5 > > > > >m;n > > > > 2 5 5 5 > > > > 1 2 3 4 > > > > 5 4 3 2 > > > > 2 3 5 4 > > > > 2 5 4 5 > > > > 1 2 3 4 > > > > 2 5 5 5 > > > > 5 4 3 2 > > > > 2 3 5 4 > > > > 2 5 4 5 > > > > > > 5 Idot > m;n > > > > ┌─────┬─────┬─┬─┬───┐ > > > > │1 2 3│ │0│2│1 3│ > > > > ├─────┼─────┼─┼─┼───┤ > > > > │ │1 2 3│0│2│1 3│ > > > > └─────┴─────┴─┴─┴───┘ > > > > > > NB. It's interesting what the monadic use of Idot does: > > > > > > Idot l1 > > > > ┌─┬─┬───┬───────┬──────┬──┐ > > > > │0│1│2 6│3 5 7 8│4 9 11│10│ > > > > └─┴─┴───┴───────┴──────┴──┘ > > > > Idot l2 > > > > ┌───┬─┬───┬─────┬──────┬──┐ > > > > │0 7│1│2 6│3 5 8│4 9 11│10│ > > > > └───┴─┴───┴─────┴──────┴──┘ > > > > Idot m ┌─┬─────┬─┬─┐ │0│1 │2│3│ ├─┼─────┼─┼─┤ │0│1 2 3│ │ │ > > ├─┼─────┼─┼─┤ > > │0│1 │2│3│ ├─┼─────┼─┼─┤ │0│1 │2│3│ ├─┼─────┼─┼─┤ │0│1 3 │2│ > │ > > └─┴─────┴─┴─┘ > > > > Idot n > > > > ┌─┬─────┬─┬─┐ > > > > │0│1 2 3│ │ │ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 3 │2│ │ > > > > └─┴─────┴─┴─┘ > > > > Idot >m;n > > > > ┌─┬─────┬─┬─┐ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 2 3│ │ │ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 3 │2│ │ > > > > └─┴─────┴─┴─┘ > > > > > > ┌─┬─────┬─┬─┐ > > > > │0│1 2 3│ │ │ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 │2│3│ > > > > ├─┼─────┼─┼─┤ > > > > │0│1 3 │2│ │ > > > > └─┴─────┴─┴─┘ > > > > Can you explain what's going on here? > > > > > > Skip Cave > > Cave Consulting LLC > > > > > > On Sun, Jan 13, 2019 at 8:02 PM Ric Sherlock <[email protected]> wrote: > > > > > Depending on what you are trying to acheive, I think I'd represent > > > the > > lack > > > of a match in a row as an empty rather than a _1: > > > > > > <@I."1 ] 5=m > > > > > > ┌┬─┬─┬─┐ > > > > > > ││3│0│2│ > > > > > > └┴─┴─┴─┘ > > > > > > > > > Of course if you need the _1 then you can transform the above > > > > > > ;@([: (a:=])`((<_1),:~ ])} <@I."1) 5 = m > > > > > > > > > On Mon, Jan 14, 2019 at 10:42 AM 'Skip Cave' via Programming < > > > [email protected]> wrote: > > > > > > > What I would really like is for I. to return a _1 whenever there > > > > is no > > 1 > > > in > > > > the match array, since there cannot be a negative index: > > > > > > > > I.5=1 2 3 4 6 4 3 4 4 6 7 6 > > > > > > > > 4 8 10 > > > > > > > > Idot 5=1 2 3 4 6 4 3 4 4 6 7 6 > > > > > > > > _1 > > > > > > > > > > > > ]m=.|:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 > > > > > > > > 1 2 3 4 > > > > > > > > 2 3 4 5 > > > > > > > > 5 4 3 2 > > > > > > > > 2 3 5 4 > > > > > > > > 5=m > > > > > > > > 0 0 0 0 > > > > > > > > 0 0 0 1 > > > > > > > > 1 0 0 0 > > > > > > > > 0 0 1 0 > > > > > > > > ,Idot .5=m > > > > > > > > _1 3 0 2 > > > > > > > > > > > > Can a verb Idot be designed, that does this? > > > > > > > > Skip Cave > > > > Cave Consulting LLC > > > > > > > > > > > > On Sun, Jan 13, 2019 at 2:41 PM Henry Rich <[email protected]> > > wrote: > > > > > > > > > Right. Prefer (I.@:= ,) to I.@,@:= since it uses special code. > > > > > > > > > > Henry Rich > > > > > > > > > > On 1/13/2019 2:54 PM, 'Mike Day' via Programming wrote: > > > > > > You often see this sort of thing, returning pairs of indices > > > > > > of all > > > > > occurrences: > > > > > > > > > > > > 5 ($@] #.inv I.@,@:=) |: 1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 > > > > > > 3 5 > > 4 > > > > > > 1 3 > > > > > > 2 0 > > > > > > 3 2 > > > > > > > > > > > > You can obviously get the row indices using {:”1 or some such, > > > > > > and > > > you > > > > > can of course make the bracketed code a named dyadic verb, > > > > > > > > > > > > Cheers, > > > > > > > > > > > > Mike > > > > > > > > > > > > > > > > > > Sent from my iPad > > > > > > > > > > > >> On 13 Jan 2019, at 17:55, 'Skip Cave' via Programming < > > > > > [email protected]> wrote: > > > > > >> > > > > > >> I know I can find the location (index) of a specific integer > > > > > >> in a > > > > > vector of > > > > > >> integers using I. > > > > > >> > > > > > >> I.5=1 2 3 4 5 4 3 4 5 6 5 6 > > > > > >> > > > > > >> 4 8 10 > > > > > >> > > > > > >> > > > > > >> So I want to find the row index of a specific integer in an > > > > > >> array > > of > > > > > >> integers: > > > > > >> > > > > > >> |:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 > > > > > >> > > > > > >> 1 2 3 4 > > > > > >> > > > > > >> 2 3 4 5 > > > > > >> > > > > > >> 5 4 3 2 > > > > > >> > > > > > >> 2 3 5 4 > > > > > >> > > > > > >> 5=|:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 > > > > > >> > > > > > >> 0 0 0 0 > > > > > >> > > > > > >> 0 0 0 1 > > > > > >> > > > > > >> 1 0 0 0 > > > > > >> > > > > > >> 0 0 1 0 > > > > > >> > > > > > >> ,I. 5=|:1 2 3 4,. 2 3 4 5,. 5 4 3 2 ,. 2 3 5 4 > > > > > >> > > > > > >> 0 3 0 2 > > > > > >> > > > > > >> > > > > > >> The first zero indicates that there is no 5 in the first row. > > > > > >> The > > > > second > > > > > >> zero gives the index of the 5 in the third row. How can I > > > > > >> tell > > > whether > > > > > the > > > > > >> zero is an index, or a null indicator? > > > > > >> > > > > > >> Skip > > > > > >> > > > -------------------------------------------------------------------- > > > -- > > > > > >> For information about J forums see > > > > http://www.jsoftware.com/forums.htm > > > > > > > > > -------------------------------------------------------------------- > > > -- > > > > > > 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 > > > -------------------------------------------------------------------- > > > -- 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
