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Groups > comp.lang.prolog > #14681

Fishy 🐟 in Scryer Prolog and SWI-Prolog (Was: Humans are just overwhelmed by computers)

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Hi,

The same example values also create fishy 🐟
sorting using native sorting in Scryer Prolog:

/* Scryer Prolog 0.9.4-417 */
?- values([z,x,y], A), sort(A, B),
    values([x,y,z], C), sort(C, D), B == D.
    false. /* fishy 🐟 */

Or using native sorting in SWI-Prolog:

/* SWI-Prolog 9.3.25 */
?- values([z,x,y], A), sort(A, B),
    values([x,y,z], C), sort(C, D), B == D.
false. /* fishy 🐟 */

Bye

Mild Shock schrieb:
> 
>  > I checked that your examples are not counter
>  > examples for my compare_with_stack/3.
> 
> What makes you think the values I show, X, Y
> and Z, are possible in a total linear ordering?
> The values also break predsort/3, you can easily
> verify that sort([x,y,z]) =\= sort([y,x,z]):
> 
> value(x, X) :- X = X-0-9-7-6-5-4-3-2-1.
> value(y, Y) :- Y = Y-7-5-8-2-4-1.
> value(z, Z) :- H = H-9-7-6-5-4-3-2-1-0, Z = H-9-7-6-5-4-3-2-1.
> 
> values(L, R) :- maplist(value, L, R).
> 
> ?- values([x,y,z], A), predsort(compare_with_stack, A, B),
>     values([y,x,z], C), predsort(compare_with_stack, C, D),
>     B == D.
> false.
> 
> But expectation would be sort([x,y,z]) ==
> sort([y,x,z]) since sort/2 should be immune
> to permutation. If this isn’t enough proof that
> there is something fishy in compare_with_stack/3 ,
> 
> well then I don’t know, maybe the earth is indeed flat?

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The Ghosts in my Cabinet: Indexing Mild Shock <janburse@fastmail.fm> - 2025-07-10 12:45 +0200
  Observed while watching FAIL/REDO ports (Was: The Ghosts in my Cabinet: Indexing) Mild Shock <janburse@fastmail.fm> - 2025-07-10 12:46 +0200
    Shocking Revelation: No eGovernment can trust Prolog! (Was: Observed while watching FAIL/REDO ports) Mild Shock <janburse@fastmail.fm> - 2025-07-10 13:26 +0200
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        Doing a Prolog system without any iterator API (Was: Easier certification with 100% Prolog Prolog?) Mild Shock <janburse@fastmail.fm> - 2025-07-10 14:14 +0200
          The headache with JIT indexing: Native -> Prolog (Was: Doing a Prolog system without any iterator API) Mild Shock <janburse@fastmail.fm> - 2025-07-10 14:40 +0200
            Just lets burn another candle for Barty Boy (Was: The headache with JIT indexing: Native -> Prolog) Mild Shock <janburse@fastmail.fm> - 2025-07-10 18:13 +0200
              Physics PhDs might never have heard of Quantifier Eliminations (Re: Just lets burn another candle for Barty Boy) Mild Shock <janburse@fastmail.fm> - 2025-07-10 18:33 +0200
                How long willl I piss on Bart Demoen (Was: Physics PhDs might never have heard of Quantifier Eliminations) Mild Shock <janburse@fastmail.fm> - 2025-07-10 18:39 +0200
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