IMO the essay should also hold the example from page 22 of 'A Brief J
Reference' of Burke & Reiter:
({.,#)/.~y may use key to get nub and frequencies appearing in y
R.E. Boss
> -----Oorspronkelijk bericht-----
> Van: [email protected]
> [mailto:[email protected]] Namens Roger Hui
> Verzonden: dinsdag 9 oktober 2012 19:08
> Aan: [email protected]
> Onderwerp: Re: [Jprogramming] Partitioning a string into unequal-length parts
>
> See also http://www.jsoftware.com/jwiki/Essays/Key
>
>
>
> On Tue, Oct 9, 2012 at 9:26 AM, Peter B. Kessler <[email protected]
> > wrote:
>
> > Key (/.) is cool! For the boolean case, plus-insert-prefix (+/\) is your
> > friend
> >
> > b =: 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0
> > +/\ b
> > 0 0 1 1 2 2 2 2 2 3 3 3 3 3 3 3 3 4 4 4 4 4 4 5 5 5
> > (+/\b) </. az
> > +--+--+-----+--------+------+-**--+
> > |ab|cd|efghi|jklmnopq|rstuvw|**xyz|
> > +--+--+-----+--------+------+-**--+
> >
> > Thanks for making me read that page.[1]
> >
> > ... peter
> >
> > [1]
> http://www.jsoftware.com/docs/**help701/dictionary/d421.htm<http://www.jsoftware.com/docs/help701/dictionary/d421.htm>
> >
> > Christoph von Basum wrote:
> >
> >> Number 1 the brute force way: (i#i.#i)</.az
> >>
> >> On Tue, Oct 9, 2012 at 4:37 PM, Roger Hui <[email protected]>
> >> wrote:
> >>
> >> I mean to say <;.2 instead of <;._2 .
> >>>
> >>>
> >>>
> >>> On Tue, Oct 9, 2012 at 7:36 AM, Roger Hui <[email protected]>
> >>> wrote:
> >>>
> >>> 1. (;i{.&.>1) <;.1 az (various ways of generating left argument; also
> >>>>
> >>> use
> >>>
> >>>> <;._2 depending on left argument).
> >>>> 2. b <;._2 az
> >>>>
> >>>>
> >>>>
> >>>>
> >>>> On Tue, Oct 9, 2012 at 7:32 AM, Ian Clark <[email protected]>
> >>>> wrote:
> >>>>
> >>>> 1. Suppose:
> >>>>> az=: 'abcdefghijklmnopqrstuvwxyz'
> >>>>> i=: 3 2 5 8 5 3 NB. -(for example)
> >>>>>
> >>>>> How best can I partition az into parts pp where (n{pp) has length (n{i)
> >>>>>
> >>>> ?
> >>>
> >>>> viz.
> >>>>> pp -: 'abc';'de';'fghij';'klmnopqr';**'stuvw';'xyz'
> >>>>>
> >>>>> 2. Suppose instead of (i) I have a boolean (b) marking where to cut az
> >>>>>
> >>>> ...
> >>>
> >>>> b =: 0 0 1 0 1 0 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0
> >>>>> (c/f dyadic {enclose} in APL+)
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