Hi,
I'm new to Jess and CLIPS so I'm working my way through Giarratano's
CLIPS user guide.
I can do all his early examples in Java, ie assertFact, retract, reset,
clear etc. I do have problems however with the duck / quack example :)
// this seems to work OK
r.assertFact (new Fact ("animal-is duck", r));
// I then add the rule
cmd = " (defrule duck (animal-is duck) " +
" => (assert (sound-is quack)) )";
System.out.println ( r.executeCommand (cmd));
// but this then fails (ie returns 0)
System.out.println ("r.run = " + r.run ());
However, if I use executeCommand (assert...) then everything works OK:
// start with this instead of assertFact and it works!
cmd = " (assert (animal-is duck)) ";
System.out.println ( r.executeCommand (cmd));
Any ideas? Is there some default slot value not getting assigned?
TIA,
John
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