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

[Blake McBride]

Interestingly, in NARS200 I get all of the same results as in IBM APL 2 except the following:

      ⍋⊃z

1 3 2 4

On Tue, Jul 8, 2014 at 9:41 AM, Blake McBride <address@hidden> wrote:

For what it is worth, IBM APL 2 gives:

      ⍋'AAA' 'Y' 'BBB' 'CC'

DOMAIN ERROR

      ⍋'AAA' 'Y' 'BBB' 'CC'

      ∧

      Z←'AA' 'XX' 'AAA' 'XXX'

      ⎕UCS¨Z

65 65  88 88  65 65 65  88 88 88

      ⍋⎕UCS¨Z

DOMAIN ERROR

      ⍋⎕UCS¨Z

      ∧

      ⊃Z

AA

XX

AAA

XXXX

      ⍋⊃Z

DOMAIN ERROR

      ⍋⊃Z

      ∧

I have no real preference regarding this.  I am just providing this for informational purposes.  Please feel free with other tests you would like me to perform.

Thanks.

Blake

On Tue, Jul 8, 2014 at 5:45 AM, Juergen Sauermann <address@hidden> wrote:

Hi Elias,

nice trick!

/// Jürgen

On 07/08/2014 08:58 AM, Elias Mårtenson wrote:

By the way, I found a workaround to the string ordering. The workaround requires memory on the order of ↑(⍴V)×⌈/⍴¨V for a vector V. This should be enough justification for the proposed extension.

Here's what I do: instead of doing the following:

      z[⍋z←'foo' 'bar' 'test' 'aaaaaa']

┌→──────────────────────────┐

│┌→──┐ ┌→──┐ ┌→───┐ ┌→─────┐│

││bar│ │foo│ │test│ │aaaaaa││

│└───┘ └───┘ └────┘ └──────┘│

└∊──────────────────────────┘

I do this:

      z[⍋⊃z←'foo' 'bar' 'test' 'aaaaaa']

┌→──────────────────────────┐

│┌→─────┐ ┌→──┐ ┌→──┐ ┌→───┐│

││aaaaaa│ │bar│ │foo│ │test││

│└──────┘ └───┘ └───┘ └────┘│

└∊──────────────────────────┘

Regards,

Elias