[R] Is it possible to define another kind of NA
Lee, Chel Hee
chl948 at mail.usask.ca
Sun Nov 9 19:30:11 CET 2014
> LDL <- NA_real_
> is.LDL <- is.na
> v <- c(0.2, 0.28, LDL, 0.9)
 0.20 0.28 NA 0.90
 FALSE FALSE TRUE FALSE
Hope this helps.
Chel Hee Lee
On 11/9/2014 12:07 PM, Marc Girondot wrote:
> Dear member list,
> In many experimental sciences, there is a lower detection limit (LDL)
> when a dosage of a product is done. Then some samples are evaluated to
> be below this limit.
> I search for the best way to indicate in a data.frame that some values
> are such LDL. Ideally, an equivalent of NA would be the best.
> Until now I manage by indicating all the column in characters.
> So the question is: is it possible to define a value that could be
> named LDL and that could take place in vectors or data.frame such as:
> v <- c(0.2, 0.28, LDL, 0.9) is the same way that NA can be used.
> with of course a function is.ldl(v) that would return F F T F
> Thanks a lot for any direction to solve this
> R-help at r-project.org mailing list
> PLEASE do read the posting guide
> and provide commented, minimal, self-contained, reproducible code.
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