Hi,
If I am correct, the left and right memory represents the organisation
of your rules activations conditions (cf. chapt. 10 of Jess5. Manual). For
example
(defrule my-rule (a) (b) (c) =>) will be fired if
( (a) && (b) ) && (c) ) is verified in this PRIORITY order.
Therefore the conditions are organized as left and right condition :
left (a) (one input-node)
right (b) (one input-node)
left (a) && (b) which is true when (a) and (b) exists. (two input node)
right (c) (one input-node)
When a left condition is verified Jess tries the rigth one then "generate" a
new two-input-node "left memory" wich is compared with another right memory
until all the conditions are met.
Then the rule is put in the agenda...
Therefore when executing (matches <rule name> ) you print the facts that
matches these conditions.
if I have the (a), (b) and (c)
in my facts base I will have after (matches my rule)
------------------- PRINT ------------------------
[Node2 ntests=0 ;usecount = 1;unique = false]
Left Memory:
[Token: size=1;sortcode=0;tag=ADD;negcnt=0;facts=(a);]
RightMemory:
[Token: size=1;sortcode=1;tag=ADD;negcnt=0;facts=(b);]
[Node2 ntests=0 ;usecount = 1;unique = false]
Left Memory:
[Token: size=2;sortcode=1;tag=ADD;negcnt=0;facts=(a);(b);]
RightMemory:
[Token: size=1;sortcode=2;tag=ADD;negcnt=0;facts=(c);]
TRUE
------------------- END PRINT ------------------------
Try the view command! It is a good way to understand Jess representaion of
a rule. For example (view my-rule) describe (with colors :)) the rule
organisation.
Remark:
Strange enough, matches always return true!! Wouldn't it be better to have
true
only when the conditions are met?
Erwan
-------------------------------------
Erwan Tranvouez ([EMAIL PROTECTED])
Doctorant - (DIAM-IUSPIM)
Domaine Universitaire de St Jerome
Av. Escadrille Normandie-Niemen
13397 Marseille Cedex 20
Tel. : 06 09 58 36 96
En cas d'urgence vous pouvez egalement m'envoyer un
texto sur mon portable a partir de www.sfr.fr
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