Good point Raul/Ari(RE). allsubsets is a true “brute force” set generation,
but as and as2 target the consecutive runs as per Quora.
> On 29 Oct 2019, at 6:46 am, Raul Miller <rauldmil...@gmail.com> wrote:
>
> Then again, since the quora problem asked for squares of consecutive
> integers, your choosing the smaller set of values was the right
> choice.
>
> The current issue seems to be about naming.
>
> "All sets" suggests the larger intermediate value.
>
> "All prefixes of suffixes" is valid, but maybe too specific?
>
> I would be tempted to go with "all consecutive [sub]sequences".
>
> Thanks,
>
> --
> Raul
>
>
>
> On Mon, Oct 28, 2019 at 3:38 PM R.E. Boss <r.e.b...@outlook.com> wrote:
>>
>> Notice the difference:
>>
>> #L:_1(allsubsets;as;<@as2)'abcdef'
>> +--+--+--+
>> |64|21|21|
>> +--+--+--+
>>
>> (as) and (as2) give only the (2!n+1) consecutive subsets, not all (2^n)
>> subsets.
>>
>>
>> R.E. Boss
>>
>>
>>> -----Oorspronkelijk bericht-----
>>> Van: Programming <programming-boun...@forums.jsoftware.com>
>>> Namens 'Rob Hodgkinson' via Programming
>>> Verzonden: zondag 27 oktober 2019 22:26
>>> Aan: jonghough via Programming <programm...@jsoftware.com>
>>> Onderwerp: Re: [Jprogramming] Quora problem
>>>
>>> Using RE’s and Henry’s suggestions, a slight generalisation to your #3 …
>>>
>>> as2=: ;(#\ <@<"1@([\) ]) ‘abcdef'
>>>
>>> Rob
>>>
>>>> On 26 Oct 2019, at 7:36 am, Skip Cave <s...@caveconsulting.com> wrote:
>>>>
>>>> Roger,
>>>>
>>>> Nice! It seems there are many different approaches:
>>>>
>>>> allsubsets=: #:@i.@(2&^)@# #"_1 _ ]
>>>> as=.3 :';<@(<\.)\y'
>>>> ;(>:i.5) (|.@[ <@{."0 1 <\) 'abcde'
>>>>
>>>> Even if the result is to be integers, It seems it is easier to start
>>>> with literals and then convert to integers later, if at all.
>>>>
>>>> My next challenge is to generate all *permutations* of all subsets.
>>>>
>>>> Skip
>>>>
>>>>
>>>>
>>>> Skip Cave
>>>> Cave Consulting LLC
>>>>
>>>>
>>>> On Thu, Oct 24, 2019 at 1:54 PM Roger Hui <rogerhui.can...@gmail.com>
>>> wrote:
>>>>
>>>>> allsubsets=: #:@i.@(2&^)@# #"_1 _ ]
>>>>> allsubsets 'abcd'
>>>>>
>>>>> d
>>>>> c
>>>>> cd
>>>>> b
>>>>> bd
>>>>> bc
>>>>> bcd
>>>>> a
>>>>> ad
>>>>> ac
>>>>> acd
>>>>> ab
>>>>> abd
>>>>> abc
>>>>> abcd
>>>>> allsubsets ;:'animal vegetable mineral'
>>>>> ┌─────────┬─────────┬───────┐
>>>>> │ │ │ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │mineral │ │ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │vegetable│ │ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │vegetable│mineral │ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │animal │ │ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │animal │mineral │ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │animal │vegetable│ │
>>>>> ├─────────┼─────────┼───────┤
>>>>> │animal │vegetable│mineral│
>>>>> └─────────┴─────────┴───────┘
>>>>>
>>>>>
>>>>>
>>>>> On Thu, Oct 24, 2019 at 11:30 AM Skip Cave <s...@caveconsulting.com>
>>>>> wrote:
>>>>>
>>>>>> I find R. E. Boss' function quite useful in many instances. I call
>>>>>> it
>>>>> "all
>>>>>> sets". Is this a standard idiom in J? Is there a more efficient
>>>>>> construction that does this? Is there a primitive that does this?
>>>>>>
>>>>>> as=.3 :';<@(<\.)\y' NB. All Sets
>>>>>>
>>>>>> as i.5
>>>>>>
>>>>>> │0│0 1│1│0 1 2│1 2│2│0 1 2 3│1 2 3│2 3│3│0 1 2 3 4│1 2 3 4│2 3 4│3
>>>>>> 4│4│
>>>>>>
>>>>>>
>>>>>> Skip
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Thu, Oct 24, 2019 at 12:30 PM R.E. Boss <r.e.b...@outlook.com>
>>> wrote:
>>>>>>
>>>>>>> Obviously the squares >2018 don't play any role whatsoever, so you
>>>>>>> can restrict yourself to %:2018
>>>>>>>
>>>>>>>> a#~2018=>+/ each a=.;<@(<\.)\2^~i.>.%:2018
>>>>>>> 49 64 81 100 121 144 169 196 225 256 289 324
>>>>>>>
>>>>>>> R.E. Boss
>>>>>>>
>>>>>>>
>>>>>>>> -----Oorspronkelijk bericht-----
>>>>>>>> Van: Programming <programming-boun...@forums.jsoftware.com>
>>>>>>>> Namens Skip Cave
>>>>>>>> Verzonden: donderdag 24 oktober 2019 19:12
>>>>>>>> Aan: programm...@jsoftware.com
>>>>>>>> Onderwerp: Re: [Jprogramming] Quora problem
>>>>>>>>
>>>>>>>> To me it seems that R. E. Boss provided the simplest approach.
>>>>>>>> Don't know about efficiency, but the results appear instantly:
>>>>>>>>
>>>>>>>>> a#~2018=>+/ each a=.;<@(<\.)\2^~i.100
>>>>>>>>
>>>>>>>> 49 64 81 100 121 144 169 196 225 256 289 324
>>>>>>>>
>>>>>>>> Skip
>>>>>>>>
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