well, iam glad as well. obviously, i wasn4t aware of that. thanx ! > I think [EMAIL PROTECTED] wrote: > [Charset iso-8859-1 unsupported, filtering to ASCII...] > > just a short appendix: shouldnt it be with $?my-list > > > > > > > The "foreach" function is the easiest way to iterate over a list. > > > > > > (bind ?my-list (create$ a b c d 1 2 3)) > > > (foreach ?item ?my-list > > > (printout t ?item crlf)) > > > > sorry for probably being fussy... ;-) > > > > Actually, no, but I'm glad you brought it up. This is something that I > believe I've done a better job of explaining in my book than I did in > the Jess manual, and it's something that I think a lot of CLIPS users > are perenially confused about. In fact, when I learned CLIPS, I was > confused about this myself, and didn't really understand until I began > to implement Jess. > > A form "$?name" is a called a "multifield." It has one, specific > meaning: "match multiple items." It can be used in two contexts: on > the LHS of a rule (where it matches multiple items in a multifield) > and at the end of the argument list of a deffunction (where it allows > you to pass a variable number of arguments to a function.) In any > other context, $?name and ?name are synonymous, and ?name is always > preferred. Both $?name and ?name refer to the *same variable.* In no > sense is "$?name" a special kind of variable that holds a list. A > variable "?name" can hold a list just as well as "$?name". Therefore, > the code above is perfectly correct as originally written. > > > --------------------------------------------------------- > 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 > > -------------------------------------------------------------------- > 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] > -------------------------------------------------------------------- >
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