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« Return to Thread: JESS: A rule that must match exactly 3 facts
Re: JESS: A rule that must match exactly 3 facts
by Ernest Friedman-Hill
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If you want object1, object2, and object3 to be different, then you
have to say so:
(defrule person-have-3-objects
(person-have-object ?person ?object1)
(person-have-object ?person ?object2&~?object1)
(person-have-object ?person ?object3&~?object2&~?object1)
=>
(printout t ?object1 ?object2 ?object3))
On May 12, 2008, at 1:25 PM, Jean-Francois Lassonde wrote:
> Hi,
>
> I'm starting with JESS and stumbled on a problem.
>
> The following rule is supposed to activate when a person have
> exactly 3 objects. (there is exactly 3 facts "person-have-object"):
>
> (defrule person-have-3-objects
> (person-have-object ?person ?object1)
> (person-have-object ?person ?object2)
> (person-have-object ?person ?object3)
> =>
> (printout t ?object1 ?object2 ?object3))
>
> In the LHS, I want to express the fact that person-have-object is
> found exactly 3 times for a unique person in the facts database. And
> I'd like to have a reference to each object for operation in the RHS.
>
> I thought that my LHS was correct but it matches when there is only
> 1 fact (person-have-object myself computer). It will prints
> "computer computer computer".
>
> How can I explicitly state that I want ?object1, ?object2 and ?
> object3 to be different?
>
> Thank you,
>
> --
> Jean-Francois Lassonde
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 ejfried@...
Livermore, CA 94550 http://www.jessrules.com
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have to say so:
(defrule person-have-3-objects
(person-have-object ?person ?object1)
(person-have-object ?person ?object2&~?object1)
(person-have-object ?person ?object3&~?object2&~?object1)
=>
(printout t ?object1 ?object2 ?object3))
On May 12, 2008, at 1:25 PM, Jean-Francois Lassonde wrote:
> Hi,
>
> I'm starting with JESS and stumbled on a problem.
>
> The following rule is supposed to activate when a person have
> exactly 3 objects. (there is exactly 3 facts "person-have-object"):
>
> (defrule person-have-3-objects
> (person-have-object ?person ?object1)
> (person-have-object ?person ?object2)
> (person-have-object ?person ?object3)
> =>
> (printout t ?object1 ?object2 ?object3))
>
> In the LHS, I want to express the fact that person-have-object is
> found exactly 3 times for a unique person in the facts database. And
> I'd like to have a reference to each object for operation in the RHS.
>
> I thought that my LHS was correct but it matches when there is only
> 1 fact (person-have-object myself computer). It will prints
> "computer computer computer".
>
> How can I explicitly state that I want ?object1, ?object2 and ?
> object3 to be different?
>
> Thank you,
>
> --
> Jean-Francois Lassonde
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 ejfried@...
Livermore, CA 94550 http://www.jessrules.com
--------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users you@...'
in the BODY of a message to majordomo@..., NOT to the list
(use your own address!) List problems? Notify owner-jess-users@....
--------------------------------------------------------------------
« Return to Thread: JESS: A rule that must match exactly 3 facts
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