Custom Numeric type in R

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.