Re: [Bug-apl] Question about behavior of ⍋

[Elias Mårtenson]

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 <address@hidden> 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 <address@hidden> 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?

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