Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.programming > #3554

Re: Generating multi-level associative arrays

Followups directed to: comp.programming

Show all headers | View raw

Victor Porton wrote:

> Rui Maciel wrote:
> 
>> Victor Porton wrote:
>> 
>>> Rui Maciel wrote:
>>> 
>>>> Victor Porton wrote:
>>>> 
>>>>> Rui Maciel wrote:
>>>>> 
>>>>>> Victor Porton wrote:
>>>>>> 
>>>>>>> But what is the best way to do this if we want a MULTILEVEL
>>>>>>> associative array? (indexed by first key "a", then by key "b", etc.)
>>>>>>> 
>>>>>>> I want to discuss the most elegant, short, and practical solution
>>>>>>> for this kind of problems.
>>>>>> 
>>>>>> I don't know if it's the most elegant, but if you wish to have
>>>>>> multiple keys map to a value then you can resort to a tuple
>>>>>> containing both keys as your map's key.
>>>>>> 
>>>>>> That approach is very common.  For example, with the "dictionary of
>>>>>> keys" matrix data structure, the matrix elements are stored in a
>>>>>> key:value pair whose key is a (row, column) tuple.
>>>>> 
>>>>> It seems you have misunderstood me. I ask about forming a *multilevel*
>>>>> associative array like:
>>>>> 
>>>>> [1:[2:[[a:1, b:2, c:3],...]]]
>>>>> 
>>>>> where "1" a value of the key "a", "2" is a value of the key "b", etc.
>>>>> 
>>>> 
>>>> What do you mean by "multi-level"? For example, from your example, by
>>>> multi- level do you mean that in order to access the value in the a:1
>>>> key value pair, the map goes something like:
>>>> 
>>>> example_map[1][2][a] == 1 ?
>>> 
>>> Yes, well almost:
>>> 
>>> example_map[1][2] (without [a])
>> 
>> Just to get things straight, you expect an outcome similar to the
>> following pseudo-ish code?
>> 
>> example_map[1][2] == 1
> 
> example_map[1][2] == [a:1, b:2, c:3]
>  
>> Rui Maciel

Oh, sorry Rui Maciel, I've falsely accused you for an error. Everything you 
have written is true.

-- 
Victor Porton - http://portonvictor.org

Back to comp.programming | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Generating multi-level associative arrays Victor Porton <porton@narod.ru> - 2013-06-22 21:19 +0300
  Re: Generating multi-level associative arrays Rui Maciel <rui.maciel@gmail.com> - 2013-06-23 08:30 +0100
    Re: Generating multi-level associative arrays Victor Porton <porton@narod.ru> - 2013-06-23 15:16 +0300
      Re: Generating multi-level associative arrays Rui Maciel <rui.maciel@gmail.com> - 2013-06-23 16:02 +0100
        Re: Generating multi-level associative arrays Victor Porton <porton@narod.ru> - 2013-06-23 18:06 +0300
          Re: Generating multi-level associative arrays Rui Maciel <rui.maciel@gmail.com> - 2013-06-23 18:52 +0100
            Re: Generating multi-level associative arrays Victor Porton <porton@narod.ru> - 2013-06-24 14:52 +0300
              Re: Generating multi-level associative arrays Victor Porton <porton@narod.ru> - 2013-06-24 14:53 +0300
  Solved: Generating multi-level associative arrays Victor Porton <porton@narod.ru> - 2013-06-24 20:36 +0300

csiph-web