Hi Vadim,
This is a very frequently asked question (I supposed it should be a
FAQ entry) by folks just getting started in rule-based languages. The
reason the solution isn't obvious is because you're thinking about it
in procedural-programming terms, which isn't appropriate for a
rule-based language. Instead of trying to create a list of facts with
some property and then iterating over the list, you should write a
rule which operates on one fact based on some criteria.
(defrule init
=>
(store HELPER (new Helper)))
(defrule one-fact
(f (v ?x))
=>
(call (fetch HELPER) addSlotVValue ?x))
)
Instead of using a custom "Helper" object for this, you might use the
Jess "bag" function, which is really just a Jess language interface to
java.util.Hashtable.
I think Vadim Zaliva wrote:
>
> Hi!
>
> I am new to CLIPS.
>
> Here is problem I am trying to solve now.
> I have several facts. For example:
>
> (f (v 1))
> (f (v 2))
> (f (v 7))
>
> now I need to write rule, which will have multifield
> containing slot 'v' value of all matching facts.
>
> (defrule all-facts
> ??????
> =>
> (bind ?helper (new Helper))
> (foreach ?i $?all
> (call ?helper addFact ?i))
> )
>
> As I see I need to feed them to some Helper object.
>
> Maybe there is some other way doing it? If no, how could I create such
> multifield. Also, I do not want to retrat facts while the rule is execute,
> I will need them later.
>
> Any advice is appreciated.
>
> Thanks!
>
> Vadim
>
> --
> ;;-----------------------------------+-----------------------------------+
> ;; [EMAIL PROTECTED] + Those who do not understand Unix +
> ;; Project Manager, Matranet Inc. + are condemned to reinvent it, +
> ;; http://www.matranet.com/ + poorly. (H. Spencer) +
> ;;-----------------------------------+-----------------------------------+
>
>
> ---------------------------------------------------------------------
> To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
> in the BODY of a message to [EMAIL PROTECTED], NOT to the
> list (use your own address!) List problems? Notify [EMAIL PROTECTED]
> ---------------------------------------------------------------------
>
>
---------------------------------------------------------
Ernest Friedman-Hill
Distributed Systems Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
Org. 8920, MS 9214 [EMAIL PROTECTED]
PO Box 969 http://herzberg.ca.sandia.gov
Livermore, CA 94550
---------------------------------------------------------------------
To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]'
in the BODY of a message to [EMAIL PROTECTED], NOT to the
list (use your own address!) List problems? Notify [EMAIL PROTECTED]
---------------------------------------------------------------------
