I believe you need to use
(length$ <multifield-expression>)
and then do a test to compare the two lengths. so the rule might look like
this
(defrule myrule
(foo
(my-list ?list1)
)
(foo
(my-list ?list2)
)
(test (eq (length$ ?list1) (length$ ?list2) ) )
=>
(printout t "the lists have the same length)
)
that's how I've done it in the past. there might be an easier way.
On Feb 19, 2008 4:04 PM, Hal Hildebrand <[EMAIL PROTECTED]> wrote:
> I've been struggling with trying to formulate a LHS which tries to
> match the length of one of the fact's multislots with another slot.
> For example:
>
> (deftemplate foo (multislot my-list) (slot desired))
>
> I've tried the following:
>
> (foo (my-list ?my-list) (desired = (length$ ?my-list))
>
> (foo { desired == (length$ my-list) } )
>
> (foo (my-list ?my-list { desired == (length$ ?my-list) } )
>
>
> And even though desired is 0 and the length of the list is 0, the rule
> simply won't fire. Obviously, I'm missing something....
>
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