I demonstrated:

>            4 5 dbp  i. 2 2 3
>       0 1 1
>          
>            4 5 okp~ i. 2 2 3
>       0 1 1
>       0 1 2
>          

Just so one doesn't conclude that  dbp -: {.@:okp~  :


           ] g =._3;:^:_1\;:'the grass is always greener when greecian grown'
        the grass is       
        always greener when
        greecian grown     
        
           'gree' dbp  g
        1 7
        2 9
           
           'gree' okp~ g
        0 4
        0 5
        0 2
        0 2
           
As I said,  dbp  will locate the rectange  x  in the array  y  .  

Because  idx0@:f  will return the indices of the ones for any predicate  f  , 
and because, in thie case   f =. E.  (fundamentally),  dbp gives the indices of 
the ones in the results of  E.  .

-Dan
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm

Reply via email to