I geuss this is a bug. On the other hand, /:~ on numeric, box or unicode
scalars works.
this will crash.
/:~'A'
Сбт, 15 Окт 2011, Nick Simicich писал(а):
> In Euler 98, there is a need to see if words are permutations of each other.
> I thought that rather than make permutation signatures, I would sort the
> words, because a sorted word should equal a sorted word when they are
> permutations, and, well, I can probably make permutation indexes allowing 4
> unsigned bits for characters, but that would require 104 bits for 26
> letters. Even 3 bits requires 78 bits. So 64 bit permutation indexes fail.
>
>
> So I tried to sort the words. Observe:
>
> ]S:_1]0{boxwords
> A
> /:~L:_1 boxwords
> ┌─┬───────┬────┬─────┬─────┬───────┬──────────┬────────┬──────┬──────┬────────┬─────────┬─────────┬───────┬───────┬───────────┬────┬───────┬──────┬───┬──────┬──────┬────────┬──────┬────────┬───┬────────┬──────────┬───────┬──────────────┬─────┬─────┬─────┬─...
> │
> │ABIILTY│ABEL│ABOTU│ABEOV│ABCEENS│ABELLOSTUY│AACCDEIM│ACCEPT│ACCESS│ACCDEINT│AACCMNOPY│ACCDGINOR│ACCNOTU│ACEEHIV│ACEEEHIMNTV│ACDI│ACEIQRU│ACORSS│ACT│ACINOT│ACEITV│ACIITTVY│AACLTU│AACLLTUY│ADD│ADDIINOT│AADDIILNOT│ADDERSS│AADIIIMNNORSTT│ADIMT│ADOPT│ADLTU│A...
> └─┴───────┴────┴─────┴─────┴───────┴──────────┴────────┴──────┴──────┴────────┴─────────┴─────────┴───────┴───────┴───────────┴────┴───────┴──────┴───┴──────┴──────┴────────┴──────┴────────┴───┴────────┴──────────┴───────┴──────────────┴─────┴─────┴─────┴─...
> 0{boxwords
> ┌─┐
> │A│
> └─┘
> /:~L:_1]0{boxwords
> ┌─┐
> │ │
> └─┘
>
> This is the story.
>
> The first element in the boxed list of words is the single letter word A.
>
> When you try to sort it, it vanishes, but other letters do not. This is a
> more visible example, limited to 5 words:
>
>
> (i.5){boxwords
> ┌─┬───────┬────┬─────┬─────┐
> │A│ABILITY│ABLE│ABOUT│ABOVE│
> └─┴───────┴────┴─────┴─────┘
> /:~L:_1(i.5){boxwords
> ┌─┬───────┬────┬─────┬─────┐
> │ │ABIILTY│ABEL│ABOTU│ABEOV│
> └─┴───────┴────┴─────┴─────┘
>
> See? Other lists are sorted properly. This one list fails.
>
> /:~'a'
>
> shows the same failure.
>
> Now, I finally see this, which is even weirder.
>
> /:~@,L:_1(i.5){boxwords
> ┌─┬───────┬────┬─────┬─────┐
> │A│ABIILTY│ABEL│ABOTU│ABEOV│
> └─┴───────┴────┴─────┴─────┘
>
> Is it as simple as the 'A' is a scalar and that you can't sort a scalar, but
> raveling it turns it into a one element vector that can be sorted?
> --
> Of course I can ride in the carpool lane, officer. Jesus is my constant
> companion.
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
--
regards,
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