Re: Help on insert using delete



matthiasse@xxxxxxx wrote:
> yeah its almost what i need
>
> i just thought of inserting it once -
>
> insert(a,[b,c,d],X).
>
> X= [a,b,c,d]
> no.
>
> the point is to use this delete implementation
> delete(_,[],[]).
> delete(X,[X|L],M):-!,delete(X,­L,M).
> delete(X,[Y|L1],[Y|L2]):-delet­e(X,L1,L2).
>
> but i dont think its possible

First, going to practical thinks:

Change delete(_,[],[]) by delete(_,Q,Q).
Or even do something like:

delete(_,A,B) :- (var(A)-> A=B; A=[], B=[]).

Reason:

The oposite of insert ONE element is remove ONE element.
The oposite of remove ALL elements that .. is insert INFINITE elements
that ... .

(Note: typing without test, no prolog available now).

.

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