I think Michael Knapik wrote: > > (subject (caseStatus ?caseStatus&:(= (?caseStatus "Suspect")) (OBJECT ?p)) > => > ...
There are a whole bunch of things going on here. First, the error being reported that caseStatus is not a multislot. This is happening because the parenthesis that should be closing the caseStatus slot is missing; therefore the parenthesis after (OBJECT ?p) (the one that is intended to be the end of the "subject" fact) is seen as being the end of caseStatus, and therefore there are two separate test items inside the slot description (the second one is the "(OBJECT ?p)"). Since this is a single slot and not a multislot, Jess complains, rightly. Matching parentheses by eye is hard -- but matching brackets in Java is hard, too. Good tools can help a lot. I've always used Emacs to edit Jess code, which works great. The Charlemagne IDE will be even better at this. Anyway, there are three other things wrong in this little line of code. One is an extra set of parentheses around the arguments to "=". A proper call to "=" would look like (= ?caseStatus "Suspect"). Second, the "=" function is for comparing numerics only, and you'll get a runtime error if you use it to compare Strings like this. You can use "eq" to compare arbitrary items -- (eq ?caseStatus "Suspect"). Finally (and it seems like I've been saying this on the list every day, lately:) when you can match directly, without using a function call, do so -- it's more efficient, less typing, and easier to understand. So I'd write this whole pattern, corrected, as (subject (caseStatus "Suspect") (OBJECT ?p)) or if you really wanted the variable ?caseStatus bound to the constant "Suspect" you could write (subject (caseStatus ?caseStatus&"Suspect") (OBJECT ?p)) --------------------------------------------------------- Ernest Friedman-Hill Science and Engineering PSEs 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] --------------------------------------------------------------------
