I'm trying to modify the ARP benchmark program to use with
Jess. One of the ARP rules:
(defrule calculate-route!process-to-generate
; Change phase from same-to-generate.
(subtask (name calculate-route))
?Control <- (rp-control (phase process))
(finish-point (x ?fx) (y ?fy) (z ?fz))
(not (possible-point (x ?fx) (y ?fy) (z ?fz)))
=>
(printout t "trying to modify" crlf)
(modify ?Control (phase generate))
(printout t "modified" crlf)
)
is evidently causing this error message:
Jess> (batch "arp.clp")
trying to modify
Jess reported an error in routine Value.numericValue
while executing (< ?_5_fd ?f)
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 ?Control (phase generate))
while executing defrule MAIN::calculate-route!process-to-generate
while executing (run)
while executing (batch "arp.clp").
Message: Not a number: "nil" (type = ATOM).
Program text: ( batch "arp.clp" ) at line 11.
at jess.Value.typeError(Value.java:382)
...
It's not clear to me how a "modify" command invokes a "<"
predicate, which seems to be what the error message is
implying. Any help in interpreting the error would be
appreciated.
I've posted the full code that I'm using and arp functions at
grove.cs.jmu.edu/arp.
Thanks,
Ralph Grove
James Madison University
[EMAIL PROTECTED]
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