Oh, I see! Thanks! On Tue, Jul 3, 2018 at 1:45 PM Alexander Burger <a...@software-lab.de> wrote:
> Hi Bruno, > > > (be vertical (line (point @X @Y) (point @X @Z))) > > (be horizontal (line (point @X @Y) (point @Z @Y))) > > > > and the query: > > (? (vertical line (point 1 2) (point 1 3))) > > Yes, OK, but then I would rather go with: > > (be vertical ((line (point @X @Y1) (point @X @Y2)))) > (be horizontal ((line (point @X1 @Y) (point @X2 @Y)))) > > i.e. the matching single parameter is a (single) list of the form > > (line (point ..) (point ..)) > > > Then you get: > > : (? (vertical (line (point 1 2) (point 1 3)))) > -> T > > : (? (vertical (line (point 1 2) (point 3 4)))) > -> NIL > > : (? (vertical (line (point 1 2) (point @X 3)))) > @X=1 > -> NIL > > —Alex > > -- > UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe >
