Untested, but what about using range/3 ? http://software-lab.de/doc/refR.html#range/3
On Sat, Nov 12, 2016 at 9:59 AM, CILz <cilz...@cilzone.fr> wrote: > Hello, > > Let's say that I have those two facts in a pilog database: > > (be age (Paul 18)) > (be age (Vincent 17)) > > I'm looking for the guy under 18 with this rule: > > (be underage (@X) > (age @X @Y) > (< @Y 18)) > > If I ask (? (underage @X)) the result here is -> NIL where I expect to get > @X=Vincent. > > If I modify the above rule with: > > (be underage (@X) > (age @X @Y) > (equal @Y 18)) > > The same query (? (underage @X)) now gives @X=Paul which is the expected > result. > > I'm sure I'm missing something in the first case but I don't know what. Any > idea? > > Thanks, > > Eric > > -- > UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
