There doesn't appear to be anything wrong here; perhaps the problem is
elsewhere in your script. You could use (watch all) to follow some of
what is happening; then you'd have a better idea of what rules were
firing and why.
I think Raj Ganesan wrote:
>
> Hi,
>
> I'm new to Jess & expert systems as well. I'm basing my code on the Pump/Tank
>example provided. Basically the goal of the experiment is: offer a first-time
>promotion to a first-time user, else offer an ongoing promotion.
>
> The UserBean has some promotion properties (counter,name,value) that are set if the
>rule fires. I am assuming that when the RHS of the rule is evaluated, the code in the
>RHS will set the bean properties appropriately.
>
> However, the following code (in a .clp file) loops infinitely. Why?
>
> (defclass UserBean test.ruleEngine.UserBean )
>
>
> (defrule qualify-for-first
> (UserBean (name ?name) (promoCounter ?counter) (promoValue ?value) (promoName
>?pName) (OBJECT ?user))
> (test (= ?counter 0))
> =>
> (printout t "User " ?name " has qualified for a first time promotion of $10.00!
>" crlf)
> (printout t "increased promotion counter to " (get ?user promoCounter) crlf
> "before promoName is " (get ?user promoName) crlf
> "before promoValue is " (get ?user promoValue) crlf)
> (set ?user promoCounter (+ ?counter 1))
> (set ?user promoName "First Time Promotion")
> (set ?user promoValue 10.00)
> (printout t "increased promotion counter to " (get ?user promoCounter) crlf
> "now promoName is " (get ?user promoName) crlf
> "now promoValue is " (get ?user promoValue) crlf)
> )
>
>
>
>
>
> ---------------------------------
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---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9012 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
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