Re: nested array formating is inconsistent

[Hans-Peter Sorge]

    Hi,
    
    thank you for your insight.
    
    
    ⍝ However I'm not convinced.
      ⍝ Comparing expr. 1 (≡ 2)  
      
            (⊂1 1)⍴ ¨2 2⍴1
       1   1
      
       1   1
      
      ⍝ to expr. 2  (≡ 3)
            ⊂¨(⊂1 1)⍴ ¨2 2⍴1
        1   1
        1   1
      
      
      ⍝ I would say the 'missing' space line is a bug.
      ⍝ The additional vertical space in expr. 2 is due to increasing
      depth.
      ⍝ But "removing" the horizontal space line makes viewing the
      output confusing.
      ⍝ For much more complex expressions it gets even counter
      intuitive.
      ⍝ It's basically about 'horizontal' vs 'vertical' formatting.  
      
      Best Regards
      Hans-Peter

Am 26.08.21 um 19:26 schrieb Blake McBride:

I would think what APLX or Dialog do is somewhat irrelevant.  I believe GNU APL is treating IBM APL 2 as the standard to be matched.

Blake

On Thu, Aug 26, 2021 at 12:21 PM Louis Chretien via Bugs and suggestions for GNU APL <bug-apl@gnu.org> wrote:

I tried the same examples in APL/X and Dyalog APL.

APL/X seems to give the same results as GNU APL: but both enclose are indented right by one column

But Dyalog APL has quite a different result: no blank lines between rows.

On Aug 26, 2021, at 12:44, Dr. Jürgen Sauermann <mail@xn--jrgen-sauermann-zvb.de> wrote:

Hi again,

checking the same in IBM APL2, the behaviour of GNU APL seems correct.
(see attached Screenshot).

Best Regards,
Jürgen

On 8/26/21 5:58 PM, Dr. Jürgen Sauermann wrote:

Hi Hans-Peter,

thanks, I will look into this.

The general problem is that the rules how nested values with rank ≥ 2 should
be displayed are, at least as far as I know, nowhere specified in a formal fashion.
From old APL 1 we know that the higher dimensions (> 2) of a not-nested value
shall be separated by a number of empty lines, but we don't really know, for example,
 how these separator lines should be handled when the value is being enclosed.

To me it is not clear if there is a line missing in ⊂¨2 2 ⍴ e or if there maybe is a line
too much in  ⊂2 2 ⍴ e (even though that way it looks a little nicer).

Best Regards,
Jürgen

On 8/26/21 11:29 AM, Hans-Peter Sorge wrote:

Hi,


⍝ just a simple matrix

      i∘.+i←¯1+⍳2
0 1
1 2

⍝ make it an element
      ⎕ ← e ← ⊂i∘.+i←¯1+⍳2
 0 1
 1 2


⍝ matrix of matrixes....
      2 2 ⍴ e
 0 1   0 1
 1 2   1 2

 0 1   0 1
 1 2   1 2


⍝ enclose the matrix of matrixes indents nicely ...
      ⊂ 2 2 ⍴ e
  0 1   0 1
  1 2   1 2

  0 1   0 1
  1 2   1 2


⍝ display of enclose each 'sub'-matrix misses space line
      ⊂¨2 2 ⍴ e
  0 1   0 1
  1 2   1 2
  0 1   0 1
  1 2   1 2

Best Regards
Hans-Peter

<APL2.png>

---

Louis Chrétien

lchretien@mac.com