The most efficient way to do it would be to use a defquery to find all
the PURCHASE facts, then iterate over the query result directly and
add them up. You could define a deffunction to do this.
I think John Goalby wrote:
> I would like to be able to have the following facts...
>
> (assert (PURCHASE 100))
> (assert (PURCHASE 150))
> (assert (PURCHASE 70))
>
> and then be able to have a rule that would give me the
> sum of these purchases. Is that possible?
>
> Thanks
>
> John.
---------------------------------------------------------
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
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