I think it'd be really handy if that expression did what we'd like it to do. I guess it'd fall under the category of "conforming extension".
Neither IBM nor ISO APL define a behavior for dyadic grade with other than a character matrix as the right argument. On Tue, 2014-07-08 at 12:40 +0800, Elias Mårtenson wrote: > To clarify, I tried the following: > > > (⎕UCS¨⍳1114111) ⍋ 'foo' 'bar' 'test' > DOMAIN ERROR > (⎕UCS¨⍳1114111)⍋'foo' 'bar' 'test' > ^ ^ > > > Note of course that this is pretty insane, and there should be an > easier way to do this. > > > Regards, > Elias > > > On 8 July 2014 12:38, Elias Mårtenson <loke...@gmail.com> wrote: > Right, but just having a "plain" collating order for Unicode > would require me to pass a million-element array > (⎕UCS¨⍳1114111) as left argument to grade. > > > That said, I can't even get dyadic grade to work at all, but > that's a separate issue. > > > Regards, > Elias > > > On 8 July 2014 12:27, David B. Lamkins <dlamk...@gmail.com> > wrote: > The problem with generating a permutation vector for > an "arbitrary" > Unicode string is still a problems of collating order. > There is no > inherent order in Unicode; someone has to decide on > what makes sense as > a collating order for the subset of code points used > by the application. > > You should use ⎕ucs with a vector of code points to > define your own > collating order for Unicode; any code points not > explicitly specified in > the collating order will sort to the end. > > For example (and this is an easy case) you can use > this to specify a > default collating order (based upon ordinal value of > the code points > themselves) for the 8-bit ASCII subset: > > ⎕ucs ⎕io-⍨⍳256 > > > > On Tue, 2014-07-08 at 12:09 +0800, Elias Mårtenson > wrote: > > Dyadic grade doesn't make much sense in the context > of Unicode though. > > How do you grade an arbitrary Unicode string? > > > > > > That issue is there even if we completely disregard > all the > > other Unicode-related collating issues. > > > > > > Regards, > > Elias > > > > > > On 8 July 2014 12:00, David B. Lamkins > <dlamk...@gmail.com> wrote: > > Check my follow-up post. > > > > I'm fairly certain that the issue is whether > monadic grade > > applied to a > > list of strings should do anything but > signal a domain error. > > The ISO > > spec says that monadic grade is defined only > on numeric > > arguments. > > > > My test case appears to have monadic grade > treating strings as > > if they > > encode numbers in a sufficiently large base. > > > > If you want to sort strings, use dyadic > grade. The left > > argument > > specifies a collating sequence. > > > > On Tue, 2014-07-08 at 11:43 +0800, Elias > Mårtenson wrote: > > > Ordering by size first makes very little > sense to me. It > > makes it very > > > hard to sort any list of strings. > > > > > > > > > I was hoping that the following would have > done so, but it > > also > > > suffers from the "length first" issue: > > > > > > > > > z[⍋ ⎕UCS¨ z←'aa' 'xx' 'aaa' 'xxx'] > > > aa xx aaa xxx > > > > > > > > > What is the proper way to sort strings > given the existing > > semantics of > > > grade? > > > > > > > > > Regards, > > > Elias > > > > > > > > > On 8 July 2014 02:34, David Lamkins > <da...@lamkins.net> > > wrote: > > > Looking at the spec, it seems that > monadic grade is > > defined > > > only for numeric data. > > > > > > > > > That leaves open the question of > whether my example > > should > > > have signaled a domain error. > > > > > > > > > > > > On Mon, Jul 7, 2014 at 11:25 AM, > David Lamkins > > > <da...@lamkins.net> wrote: > > > Given a list of character > vectors (and > > scalars), grade > > > appears to generate the > permutation vector > > first by > > > length then by content. > > > > > > ⍋'aaa' 'xx' 'y' > 'bbb' 'cc' > > > 3 5 2 1 4 > > > > > > > > > This seems > counterintuitive. It seems as if > > ⍋ treats > > > character strings like > numbers. Is this a > > bug? > > > > > > -- > > > "The secret to creativity > is knowing how to > > hide your > > > sources." > > > Albert Einstein > > > > > > > > > > http://soundcloud.com/davidlamkins > > > > http://reverbnation.com/lamkins > > > > http://reverbnation.com/lcw > > > http://lamkins-guitar.com/ > > > http://lamkins.net/ > > > > http://successful-lisp.com/ > > > > > > > > > > > > -- > > > "The secret to creativity is > knowing how to hide > > your > > > sources." > > > Albert Einstein > > > > > > > > > http://soundcloud.com/davidlamkins > > > http://reverbnation.com/lamkins > > > http://reverbnation.com/lcw > > > http://lamkins-guitar.com/ > > > http://lamkins.net/ > > > http://successful-lisp.com/ > > > > > > > > > > > > > > > > > > > > > > >