Hi Nil,
Actually, I figured out the "now" part:
(AtTimeLink
(EvaluationLink
(PredicateNode "score-of")
(ListLink (ConceptNode "John")
(NumberNode 8))
(TimeNode (current-time)))
)
I still need to figure out how to query previous scores and in particular
the last score that was assigned to John.
On Tuesday, December 11, 2018 at 1:12:22 PM UTC, Nil wrote:
>
> On 12/11/18 2:13 PM, Johannes Castner wrote:
> > What I'm trying to say is a user has an account and an account has
> > points in it that can change--just as with any computer game, really.
> > Does that make sense?
>
> There are different ways to do that, and they depend on what you
> intend to do with the knowledge. One way would be to use value
>
> https://wiki.opencog.org/w/Value
>
> for instance to attach a score of 3 to John, you'd say
>
> ```
> (define john (Concept "John"))
> (define score (Concept "score"))
> (cog-set-value! john score (Number 3))
> ```
>
> then you may ask John's score with
> ```
> (cog-value john score)
> ```
> which will return 3.
>
> Later on you may update John's score with
> ```
> (cog-set-value! john score (Number 4))
> ```
>
> And
> ```
> (cog-value john score)
> ```
> which will return 4.
>
> The problem with that (and with mutability in general) is that you
> lose information. So for instance you won't be able to use reasoning
> or specialized forms thereof like pattern mining to analyze the
> evolution of your data. For that you need to keep track of these
> updates. One way could be to use AtTimeLink, so for instance you way
> write that at 10pm John had a score of 3
>
> AtTimeLink
> Evaluation
> Predicate "score-of"
> List
> (Concept "John")
> (Number 3)
> TimeNode "10pm"
>
> but at 11pm he had a score of 4
>
> AtTimeLink
> Evaluation
> Predicate "score-of"
> List
> (Concept "John")
> (Number 4)
> TimeNode "10pm"
>
> Etc... There are many ways to represent knowledge.
>
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