Hi David,
You can express this using the member$ function:
?f1 <- (abc (items $?list&:(not (member$ x $?list))))
I think David Thureson wrote:
>
> I'm having trouble with a pattern conditional element.
> Hopefully someone will spot the answer in a second, and if
> so I would really appreciate any advice.
>
> If I try to match on every fact "abc" where "x" is an
> element in the multislot "items", this works:
>
> ?f1 <- (abc (items $? x $?))
>
> But I can't figure out how to match on every fact "abc"
> where "x" is _not_ an element. I've read both the Jess
> readme and the CLIPS manual, and tried various combinations
> of "~" and "NOT", but I can't get anything that compiles.
>
> Here's a file that reproduces my situation in the simplest
> possible form, with the line in question highlighted.
>
> ------------------------------------------
>
> (watch all)
>
> (deftemplate abc
> (multislot items)
> )
>
> (defrule rule1
>
> ;===========================================================
> ;The following works. The question is, how do you negate
> it?
> ?f1 <- (abc (items $? x $?))
>
> ;===========================================================
> =>
> )
>
> (defrule startup ""
> =>
> (assert (abc (items x)))
> (assert (abc (items y)))
> (assert (abc (items x y)))
> (assert (abc (items y x)))
> )
>
> (reset)
> (run)
>
> ------------------------------------------
>
> Thanks for any advice.
>
> -- David Thureson
> -- [EMAIL PROTECTED]
>
>
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Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
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