1j1# data

a b r a c a d a b r a

1j2# data

a b r a c a d a b r a

2j1# data

aa bb rr aa cc aa dd aa bb rr aa

2j2# data

aa bb rr aa cc aa dd aa bb rr aa

I had no idea!


Skip Cave
Cave Consulting LLC


On Sat, Feb 1, 2020 at 11:18 AM Don Guinn <[email protected]> wrote:

>    1j1# data
> a b r a c a d a b r a
>
> On Sat, Feb 1, 2020, 9:46 AM David Lambert <[email protected]> wrote:
>
> >    data=:'abracadabra'
> >
> >    NB. whereas
> >    1j_2 # data
> > |domain error
> > |   1j_2    #data
> >
> >    NB. I've often wanted
> >    _2 |. 1j2 # data
> >   a  b  r  a  c  a  d  a  b  r  a
> >
> >    NB. because it aligns with
> >
> >    3 ": i.~ data                      NB. index from left
> >   0  1  2  0  4  0  6  0  1  2  0
> >
> >    3 ": i:~ data                      NB. index from right
> >  10  8  9 10  4 10  6 10  8  9 10
> >
> >    duplicate =: (i: ~: i.)~
> >    duplicate data
> > 1 1 1 1 0 1 0 1 1 1 1
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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For information about J forums see http://www.jsoftware.com/forums.htm

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