Access a slot from multifield in deffunction
I have开发者_JAVA技巧 this function which calculates some value based on multiple slots of multiple multifield facts.
Because quite some slots are involved and all of them are needed in the function I was thinking if I could pass a whole fact to a function and access its slots in it, like so:
(deftemplate a-fact
(slot id)
(slot name)
(slot ...)
...
)
(deffunction a-funciton (?factadr)
(switch ?factadr:name
(case bla then ...)
)
(return ?calculated-value)
)
(defrule a-rule
?factadr <- (a-fact (id ?i))
=>
(if (> **(a-function ?factadr) 20) then ... )
)
I saw this ?fact-adrres:slot-name in this example and thought it will work but it doesn't. So, is it possible and how to do it?
(bind ?facts (find-all-facts ((?f attribute))
(and (eq ?f:name wine)
(>= ?f:certainty 20))))
Clips 6.3 is used.
Use the fact-slot-value function.
CLIPS>
(deftemplate a-fact
(slot id)
(slot name))
CLIPS>
(defrule a-rule
?f <- (a-fact)
=>
(printout t (fact-slot-value ?f id) " " (fact-slot-value ?f name) crlf))
CLIPS> (assert (a-fact (id 3) (name x)))
<Fact-1>
CLIPS> (assert (a-fact (id 7) (name y)))
<Fact-2>
CLIPS> (run)
7 y
3 x
CLIPS>
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