[R] Custom Numeric type in R

[Rui Barradas]

Hello,

Try the following.

 > class(NA)
[1] "logical"
 > class(NaN)
[1] "numeric"
 > class(Inf)
[1] "numeric"


So my guess is that what the op wants is not possible. And that to 
declare a new class shouldn't solve the problem.

Rui Barradas

Em 10-11-2013 21:07, Bert Gunter escreveu:
> Charles:
>
> That was my initial thought, too. But then I wondered whether what was
> meant was to use "TBD" as an alternative kind of numeric value that
> would be part of numeric vectors, lists, etc.  in the same way that NA
> or Inf is. It is not clear to me that a new object class provides a
> way to do this, at least not without a large amount of recreating
> standard R objects and the operations on them to include a "TBD" type
> numeric. My understanding is that NA and Inf are built into R's
> internals as part of IEEE floating point standards. I do not know how
> or if one can add new numeric types to these.
>
> I would appreciate correction of any misunderstanding that I have and
> further details as to how one would do this.
>
> Best,
> Bert
>
> On Sun, Nov 10, 2013 at 9:49 AM, Charles Berry <ccberry at ucsd.edu> wrote:
>> Christofer Bogaso <bogaso.christofer <at> gmail.com> writes:
>>
>>>
>>> Hi again,
>>>
>>> In R, there are various numerics like, NA, Inf, or simple integers etc.
>>> However I want to include one custom type: "TBD", which R should treat as
>>> numeric, not character.
>>>
>>> That "TBD" should have same property like Inf, however except this: TBD -
>>> TBD = 0
>>>
>>> In future, I am planning to add few more properties to TBD.
>>>
>>> Can somebody guide me if this is possible in R, ans also some pointer on
>>> how can be done in R
>>>
>>
>> Possible? Yes.
>>
>> Your question might be framed as
>>
>> "How do I create a class and write a method for '-' that does ... ?"
>>
>> The answer is "learn about methods and classes in R".
>>
>> To get started, see
>>
>>   ?methods
>>   ?class
>>   ?groupGenericFunction-class
>>   ?groupGeneric
>>
>> and follow the links therein.
>>
>>
>> Check the posting guide. If you need to follow up, you should consider
>> whether the question you have fits better on R-devel.
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>
>