[Jprogramming] rank trouble

[Graham Parkhouse]

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Thank you Devon and Alexander! -. does intersection most elegantly. I shall
use it.

On Fri, 1 Jun 2012 12:50:43 -0400 Devon McCormick <devonmcc at gmail.com>
wrote:
 
> You could also do this:
> 
>    e ([:~.]-.]-.[) pi
> 3 1 2
>    pi ([:~.]-.]-.[) e
> 2 1 3
> 
> Without the "nub" gives an arguably more correct answer:
> 
>    pi (]-.]-.[) e
> 2 1 2 1 3
>    e (]-.]-.[) pi
> 3 1 1 2
> 
>    /:~"1 e,:pi
> 1 1 2 2 3 7 8 8 8
> 1 1 2 3 4 5 5 6 9
> 
> 
> On Thu, May 31, 2012 at 10:48 AM, Graham Parkhouse
> <graham.parkhouse at ntlworld.com> wrote:
> > Can anyone help me to understand where I am going wrong?
> >
> > ? e=: 2 7 1 8 2 8 1 8 3
> > ? pi=: 3 1 4 1 5 9 2 6 5
> > ? isecn=: ([: /:~ [: ~. e. # [)"1 ? ? NB. Intersection of the two
> sets
> > ? e isecn pi
> > 1 2 3
> > ? pi isecn e
> > 1 2 3
> > ? isecn/ e,:pi
> > 1 2 3
> > ? isecn/"1 e,.pi
> >
> >
> >
> >
> >
> >
> >
> >
> > This last sentence give me 9 blank lines. I expected and wanted 1 2
> 3. Is my
> > view of rank and frames too simplistic?
> >
> > Regards
> >
> > Graham
> >
> > ---------------------------------------------------------------------
> -
> > For information about J forums see
> http://www.jsoftware.com/forums.htm
> 
> 
> 
> --
> Devon McCormick, CFA
> ^me^ at acm.
> org is my
> preferred e-mail
 
On Fri, 1 Jun 2012 10:35:26 -0700 (PDT) Alexander Mikhailov
<avmich at yahoo.com> wrote:
 
> Without the "nub" gives an arguably more correct answer:
> 
>    pi (]-.]-.[) e
> 2 1 2 1 3
>    e (]-.]-.[) pi
> 3 1 1 2
> -----
> 
> Why not
> 
> e ([ -. -.) pi
> 2 1 2 1 3
> ?

Regards

Graham
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