Ric Sherlock wrote:
>
> Update!
> Ewart Shaw sent me this version which looks to be nicer in all respects.
>
> findinRows=: +./@((*. +./\.)/@|:@(=/))
>
> On Fri, Aug 19, 2011 at 9:28 AM, Ric Sherlock <[email protected]> wrote:
>> Thanks to everyone for the interesting approaches. I enjoyed
>> dissecting the different thinking processes.
>>
>> As Marshall points out, not all the solutions will work on lists that
>> contain non-unique characters which I think is a desirable
>> characteristic. His development of Raul's approach seems to have the
>> best combination of generality, performance and simplicity.
>>
>> findinRows=: [: *@#@> [: ([ #~ (< {:))&.>/ <@I.@(=/~)
>>
> [...]
>
Shaw's solution is really nice. Let's not forget though that
Marshall's is more general.
Straightforward simplification of the later is to replace
([ #~ (< {:))
by
((< {:) # [)
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