I always have trouble getting retract or modify to work.
If (assert (total 0)) gets asserted somewhere, and I want to add to in
another rule:
(defrule load_breakfast
(more ?m)
?t <- (total ?t)
=>
(modify ?t (+ ?t ?m))
)
or
(retract ?t)
(assert (total (+ ?t ?m))
I get messages like:
ATTENTION: Rete Exception in routine Fact::FindSlot while executing
defrule load_breakfast.
Message: Attempt to find named slot in ordered fact at line 0: ( run
) .
Anyone know the answer?
Thanks
Christo
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