Re: Floyd warshall

On Fri, 31 Aug 2007 02:44:29 -0700, andrea wrote:

On 31 Ago, 09:17, Bart Demoen <b...@xxxxxxxxxxxxxxxxx> wrote:
andrea wrote:
I tried with a very small example

prova(X,Y) :-
dist(X,Y,Z), Z > 2 ->
write('maggiore'); write('minore'),write(Z).

?- prova(0,1).
minore_L136

So in the "else branch" Z is not unified anymore, why?? I dont' find a
suitable explanation..
How can I translate this little piece of code?

Suppose you had written (sorry for my indentation, I hope it is still readable to you)

f(X) :-
(test(X) ->
true
;
write(X)
).

test(foo) :- fail.

What value would you like to see on the output ?

Cheers

Bart Demoen

In this case nothing, but my test is not true, so it should enter in
the else branch, am I missing something??

Yes. You missed that my test is not true either. So, once more,
what do you want to be output in my f/1 ?

Cheers

Bart Demoen

.

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