使用剪辑时试图收回事实

Question

我是剪辑新手，我发现我的retract并没有真正删除事实。

(defrule test
(select ?select~indoor&~outdoor)
=>
(retract ?select)
)

剪辑完运行这段代码后，我尝试用(facts)查看，结果还是发现select的事实还在

Answer 1

您需要将变量绑定到与模式匹配的事实。您不能通过将变量绑定到事实中的值来撤销事实。

         CLIPS (6.31 2/3/18)
CLIPS> 
(defrule test
   ?f <- (select ...)
   =>
   (retract ?f))
CLIPS> (assert (select ...))
<Fact-1>
CLIPS> (facts)
f-0     (initial-fact)
f-1     (select ...)
For a total of 2 facts.
CLIPS> (run)
CLIPS> (facts)
f-0     (initial-fact)
For a total of 1 fact.
CLIPS>

使用剪辑时试图收回事实

trying to retract facts when using clips

clips