Hi Sunil,
Use the non-relational goal "project" to get the value of a lvar.
The "is" operator in Prolog does similar things AFAIK.
Untested:
(defnu lengtho [l n]
([[] 0])
([[_ . rst] _] (fresh [n1]
(lengtho rst n1)
(project [n n1]
(== n (+ n1 1)))))
Thanks,
Ambrose
On Sat, Oct 8, 2011 at 3:50 PM, Sunil S Nandihalli <
[email protected]> wrote:
> Hi everybody,
> I was just trying to implement a simple length of a list in core.logic
> (basically solving the 99-problems-in-prolog). I am not able to find a way
> to increment values.. Can somebody help me with this... I would like some
> thing like the following to work..
>
> (defnu lengtho [l n]
> ([[] 0])
> ([[_ . rst] _] (fresh [n1]
> (lengtho rst n1)
> (== n (+ n1 1))))
>
> but I can't do "(== n (+ n1 1))" can somebody help me? Even if you tell me
> as to how I can covert the regular count function so that I can use it as a
> goal.. that would work too.
> Thanks,
> Sunil.
>
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