You can treat those ?o1, ?o2 variables as if they refer to either
integers or jess.Fact objects. Here, it's integers we want. So,
similar to the last rule, you might do something like
(defule rule-2
?o1 <- (O (S ?s1))
(test (= ?o1 1))
?o2 <- (O (S ?s2&:(> ?s1 ?s2)))
(test (= ?o2 2))
=> ...)
On Oct 2, 2007, at 5:27 PM, ameng wrote:
Hello,
Thanks a lot for helping me!
It is working if there are only 2 facts in the working memory. If
there are
more than 2 facts, the rules will be fired several times. Is
there a way
to make sure that o1 is associated to fact 1 and o2 is linked to
fact 2?
Following does not fire any rule:
?o1 <- (fact-id 1) (S ?s1))
?o2 <- (fact-id 2)(S ?s2))
(test (> ?s1 ?s2)))
=>
...
Thanks a lot!
Andrew
Ernest Friedman-Hill wrote:
If I understand you correctly, the assertion order matters here;
i.e., your "fact 1" is the first one asserted, and "fact 2" is the
second. The order in which facts are asserted is normally not a
concern, but Jess does track it, and you can make a rule conditional
on it; you might do something like this. Let's call the object type
"O" and the slot "S":
(defrule rule-1
?o1 <- (O (S ?s1))
?o2 <- (O (S ?s2))
(test (and (> ?o2 ?o1) (> ?s1 ?s2)))
=> ...
Comparing ?o1 and ?o2 here assures that the object with the higher
fact index (i.e., the one that was asserted later) is the one with
the lower value in S.
On Oct 1, 2007, at 11:01 PM, ameng wrote:
Hello,
From java program, I added a couple of shadow facts of same object
type into
working memory in particular order. When defining a rule, how I can
do thing
like:
value of slot 1 in fact1 > value of slot 1 in fact 2
=>
doing something
---------------------------------------------------------
Ernest Friedman-Hill
Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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Informatics & Decision Sciences Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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