Hi, Norman Richards,
In the example, "arg" and "goal" were not literal but were meant to be
replaced with something appropriate to whatever you are trying to do. Yes,
unless you use a projected value, it is equivalent to precomputing it
outside the run*. The point was that, although very hacky, th
Sorry - gmail spasm
What I was trying to say is that what I think your code is doing is running
a Clojure expression once and unifying with 0. It's equivalent to
precomputing that outside of the run*:
(let [result (count (run* [arg] (goal arg))]
(run* [q]
;; whatever-else-you-were doi
On Fri, Aug 9, 2013 at 4:19 PM, Alex Dowad wrote:
>
> (== 0 (count (run* [arg] (goal arg
>
What this is actually doing
(run* [q]
;;... some stuff
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I've since added an experimental Prolog style negation as failure
constraint `nafc`.
On Fri, Aug 9, 2013 at 5:19 PM, Alex Dowad wrote:
> Sorry to post on an old thread, but just in case someone comes here from
> Google:
>
> I'm just playing with core.logic, and I think I found a way to negate a
Sorry to post on an old thread, but just in case someone comes here from
Google:
I'm just playing with core.logic, and I think I found a way to negate a
goal... I don't know if this is advisable or not, but it seems to work:
(== 0 (count (run* [arg] (goal arg
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ground. So it's not relational.
>
> I have some leads based on recent Prolog research (CiaoProlog, and an
> interesting dissertation on the abstract interpretation of Prolog) for
> really handling negation in core.logic but I don't think I'll have time to
> deal with it
search (CiaoProlog, and an
interesting dissertation on the abstract interpretation of Prolog) for
really handling negation in core.logic but I don't think I'll have time to
deal with it any time soon. Again, more than willing and excited to
collaborate with people who would like to see it don
Hello,
Is there a way to negate a goal in core.logic? I have written this goal
below, and I would like to use it to query all the pairs of people who are
*not* relatives according to my facts (for dating purposes of course :-D)
(defn relative [p1 p2]
(conde
[(parent p1 p2)]
[(parent p
