I think that Dan Malka wrote: >> i would like to know, how to test a multislot if it's fill or not. >> what kind of function may i use?
Hi Dan, If you mean that you want to know if a multislot has any values, you could use the length$ function. For example: ;; Let ?x be any variable that holds a list (if (= (length$ ?x) 0) then ; Do something interesting ) An admittedly contrived Jess script that uses this might be: ;;================ dan.clp ==================== (clear) (watch all) (deftemplate foo (slot id) (multislot data)) (defrule delete-empty-foos "Retracts all foo facts with no data" ?f <- (foo (data $?data&:(= (length$ $?data) 0))) => (retract ?f)) (reset) (assert (foo (id abc123))) (run) If you run this batch file, Jess prints out: MAIN::delete-empty-foos: +1+1+1+1+t ==> Focus MAIN ==> f-0 (MAIN::initial-fact) ==> f-1 (MAIN::foo (id abc123) (data )) ==> Activation: MAIN::delete-empty-foos : f-1 FIRE 1 MAIN::delete-empty-foos f-1 <== f-1 (MAIN::foo (id abc123) (data )) <== Focus MAIN Click here for more info: http://herzberg.ca.sandia.gov/jess/docs/61/functions.html#length$ Cheers, Jason ------------------- Morris Technical Solutions www.morristechnicalsolutions.com [EMAIL PROTECTED] phone/fax: 503.692.1088 -------------------------------------------------------------------- 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] --------------------------------------------------------------------
