Re: question on assert and retract

[bruno patin]

Thanks for your help. I tried the litlle example and it worked as 
waited. I understood what I've done to btain my no rreply. Don't take 
this into account. But now, as listing is not an iso-prolog directive 
how not to add the same facts two times ? and has assertz the same 
comportment in other prolog implementations ?

thanks again

Vic Bancroft wrote:

> On Tue, 27 Aug 2002, Timo Karjalainen wrote:
>
>  
>
> > On Mon, 26 Aug 2002, Vic Bancroft wrote:
> >
> > Or are you sure you didn't backtrack over the retract/1 call? It will be
> > executed again until there are no more matches.
> >
> >    
> >
> > > The 1.2.12 version gives,
> > >
> > >  | ?- retract(toto(2)).
> > >
> > >  true ? ;  <-----------------+
> > >                              |
> > >  yes                         |
> > >      
>                                  !
> I did sneak in the backtrack port !  
>
> more,
> l8r,
>
> ------------------------------------------------------------------- 
> Victor Bancroft, Principal Engineer, Zvolve Systems [v]770.551.4505 
> 1050 Crown Pointe Pkwy, Suite 300, Atlanta GA 30338 [f]770.551.4509 
> Fellow, Artificial Intelligence Center              [v]706.542-0358 
> Athens, Georgia  30602, U.S.A           http://ai.uga.edu/~bancroft 
>
>
>