To me, the error message seems very straightforward: one of the
variables used on the line
(> ?yb ?c1b)
is nil (i.e., null) instead of being a number. ">" requires both its
arguments to be numbers.
To fix, look at the rule where this test appears, look where the
variables come from, trace backwards to where the values should come
from, and figure out why they're nil.
On Jun 19, 2007, at 3:40 PM, [EMAIL PROTECTED] wrote:
Hello.
I get the next error:
Jess reported an error in routine >
while executing (> ?yb ?c1b)
while executing 'test' CE
while executing rule LHS (Node2)
while executing rule LHS (Node2)
while executing rule LHS (Node2)
while executing rule LHS (Node2)
while executing rule LHS (Node2)
while executing rule LHS (Node2)
while executing rule LHS (Node2)
while executing rule LHS (TEQ)
while executing rule LHS (TECT)
while executing (modify ?fase (es "jugar"))
while executing defrule MAIN::control-nulo
while executing (run).
Message: Not a number: nil.
------
I´m trying do:
(deffacts robots_ball
(yo_ball (fetch "difyo_ball"))
(yo_myport (fetch "difyo_myport"))
(yo_suport (fetch "difyo_suport"))
(comp1_ball (fetch "distcomp_ball1"))
(comp2_ball (fetch "distcomp_ball2"))
(comp1_yo (fetch "distcomp_yo1"))
(comp2_yo (fetch "distcomp_yo2"))
(comp1_miport (fetch "distcomp_miport1"))
(comp2_miport (fetch "distcomp_miport2"))
(comp1_suport (fetch "distcomp_suport1"))
(comp2_suport (fetch "distcomp_suport2"))
)
;;;
(defrule control-nulo
(declare (salience 1000))
(fase (es "nil3"))
(comp1_ball ?c1b)
(comp2_ball ?c2b)
(test (neq nil ?c1b))
(test (neq nil ?c2b))
?fase<-(fase(es "nil3"))
=>
(printout t "Ninguno de los sensores es nil" crlf)
(modify ?fase(es "jugar"))
)
;;;
(defrule portero0 "portero si soy el que está mas lejos de la
pelota y más cerca de la portería de todos mis compañeros"
(declare (salience 500))
(fase (es "jugar"))
(yo_ball ?yb)
(yo_myport ?yp)
(comp1_miport ?c1p)
(comp2_miport ?c2p)
(comp1_ball ?c1b)
(comp2_ball ?c2b)
(sensores(mi_porteria_x ?mpx)(mi_porteria_y ?mpy)(num_jugador ?nj))
(test (> ?yb ?c1b))
(test (> ?yb ?c2b))
(test (< ?yp ?c1p))
(test (< ?yp ?c2p))
?mover<-(mover)
=>
(printout t "SOY EL PORTERO AHORA" ?nj crlf)
(modify ?mover(eje_x ?mpx)(eje_y ?mpy)(velocidad 1)(chutar 0))
(assert (portero))
)
;;;
And I´m calling from JAVA with:
for(i = 1; i < teammates.length+1; i++){
cadena2= "distcomp_ball" + i;
Vec2 aux = new Vec2 ( teammates[i-1].x - ball.x, teammates [i-1].y
- ball.y);
jess_engine.store(cadena2, new Value (aux.r, RU.FLOAT));
}
Then, if I use
;;;(test (neq nil ?c1b))
;;;(test (neq nil ?c2b))
I get the error as stated above and if i use without ;;;
(comments), I get in JAVA a fatal error and it doesn´t work:
Exception in thread "Thread-2" java.lang.NullPointerException
at Player.TakeStep(Player.java:212)
at EDU.gatech.cc.is.abstractrobot.ControlSystemS.takeStep
(ControlSystemS.java:127)
at TBSim.SimulationCanvas.run(SimulationCanvas.java:971)
at java.lang.Thread.run(Unknown Source)
----------------
I don´t why is it going on!!! Any help or suggestion?
Thanks for all.
Ricardo.
---------------------------------------------------------
Ernest Friedman-Hill
Advanced Software Research Phone: (925) 294-2154
Sandia National Labs FAX: (925) 294-2234
PO Box 969, MS 9012 [EMAIL PROTECTED]
Livermore, CA 94550 http://www.jessrules.com
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