Tassilo Horn wrote:
> Erebus Mons <erebus.m...@gmail.com> writes:
>
>> I am reading in a csv-file, and then transform the attributes into a
>> hash-map:
>>
>>
__________________________________________________________________________
>> name,property1,property2,etc
>> John,drunk,stinks,etc.
>> etc.
>>
__________________________________________________________________________
>>
>> {"John" {:property1 "drunk", :property2 "stinks"} etc
>
> Why a map of maps and not a map of sets, e.g.:
>
> {"John" #{"drunk" "stings"}}
Because I need to know what kind of property the properties are
>
> Then your predicates just turn into membership checks instead of having
> to search through the values of the properties map. That is, drunk? is
> just:
>
> (defn drunk? [person-prop-map person]
> (contains? (person-prop-map person) "drunk))
>
>> then I create with a function functions like drunk?, so that I can
>> check whether John is drunk
>>
>> (drunk? "John")
>> true
>>
>> I need to be able to get all properties in the map but
>> drunk?. Therefore, I thought it would be handy to be able to filter
>> out drunk? from the functions, but I figured I can only do that if I
>> can treat the function-name like a name...
>
> You need to filter it out in order not to define the same function
> several times, or do I get you wrong?
>
> If so, why not get the unique set of properties after building the map,
> and then generate one predicate for any property that occured?
>
> ;; If the props are storted as sets like suggested above, then...
> (apply clojure.set/union (vals person-prop-map))
> ;; ...gives you the set of unique property names.
This is what I do already (but within a map of maps).
Once I have defined the predicates (which works), I partition elements that
satisfy a sub-property (e.g., drunk?) and those that don't. Now that I
explain that, I might just draw a random property, and then I would not need
the function stringify...
But I was intrigued - I assumed that stringifying a function-name should be
easy to do.
Thank you!
>
> HTH,
> Tassilo
>
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