A follow up question: (tariff (type A) (keys $? ?k $?))
does "$?" match at least 1 or also 0 occurrences ? means will the following also match with the same rule ? (assert(tariff (type A) (keys 22 33 44 55))) (assert(event (type A) (key 22))) thank you regards Mark -----Urspr|ngliche Nachricht----- Von: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Im Auftrag von [EMAIL PROTECTED] Gesendet: Dienstag, 9. September 2003 00:37 An: [EMAIL PROTECTED] Betreff: Re: JESS: Jess Beginner, How to verify if a value is in a list? I think Mark Egloff wrote: > Hello there > > My next question is, how can I check if a specific value is in a list? > The list is part of a fact. > > Example: > > (assert(tariff (type A) (keys 22 33 44 55))) > (assert(event (type A) (key 33))) > > How do I check if the "key" slot from fact "event" is contained in the > "keys" list of fact "tariff"? In a rule, one way to do this is (defrule find-key (event (type A) (key ?k)) (tarriff (type A) (keys $? ?k $?)) => ... This will fire only for matching pairs of facts. --------------------------------------------------------- Ernest Friedman-Hill Distributed Systems Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] -------------------------------------------------------------------- -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
