Hi Ernest,
Thanks very much for your response. I tried what you gave, and I
couldn't get the match to happen. (I noticed that the left hand argument
to eq doesn't have a question mark--I tried it without and with.)
Here is what I tried:
?path-node <- (path-node (path ?path-id)&:(eq ?path-id ?*selected-path-id*))
(node ?node-id)
(act-classification nil))
That doesn't work. But when I do the following:
?path-node <- (path-node (path ?path-id)
(node ?node-id)
(act-classification nil))
(test (eq ?path-id ?*selected-path-id*))
it works just fine. And so problem is solved, though I'd like to know
why the first way isn't working if you see it. (Again, I tried it without
the ? in front of path-id as well, as your examples seemed to suggest.)
Thanks,
Willie
On Fri, 16 Mar 2001, friedman_hill ernest j wrote:
>
> (get-var) was a kludge to let you refer to globals on rule LHSs at all
> -- i.e., to allow you to even use them in expressions like
>
> (foo (bar ?a&:(eq a (get-var ?*b*))))
>
> Nowadays you can just write
>
> (foo (bar ?a&:(eq a ?*b*)))
>
> So the get-var function doesn't exist anymore. The ability to directly
> match defglobals, something like
>
> (defrule foo
> (global ?*b* 37)
>
> is something that we have indeed talked about, but I've never
> implemented.
>
>
> I think Willie Wheeler wrote:
> > Hi all,
> >
> > I am trying to figure out how to match globals on the left-hand
> > side. I searched the archives and found Jess's behavior with respect to
> > this issue characterized variously as a bug and as a idiosyncracy, and I
> > even found a message where a "matchable" attribute for defglobal was
> > proposed, but there is no mention of a solution. (Well, there was one
> > mention of a get-var function being involved, but I don't see any such
> > function in the manual and it doesn't seem to work in the code.)
> >
> > Willie
> >
> >
>
>
>
> ---------------------------------------------------------
> Ernest Friedman-Hill
> Distributed Systems Research Phone: (925) 294-2154
> Sandia National Labs FAX: (925) 294-2234
> Org. 8920, MS 9012 [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]
---------------------------------------------------------------------
