(v3.0.1.9026) fix ab_group(NA)

man/as.ab.Rd

@@ -1,10 +1,12 @@
 % Generated by roxygen2: do not edit by hand
 % Please edit documentation in R/ab.R
+\docType{data}
 \name{as.ab}
 \alias{as.ab}
 \alias{ab}
 \alias{is.ab}
 \alias{ab_reset_session}
+\alias{NA_ab_}
 \title{Transform Input to an Antibiotic ID}
 \usage{
 as.ab(x, flag_multiple_results = TRUE, language = get_AMR_locale(),
@@ -13,6 +15,8 @@ as.ab(x, flag_multiple_results = TRUE, language = get_AMR_locale(),
 is.ab(x)
 
 ab_reset_session()
+
+NA_ab_
 }
 \arguments{
 \item{x}{A \link{character} vector to determine to antibiotic ID.}
@@ -47,6 +51,8 @@ Use the \code{\link[=ab_property]{ab_*}} functions to get properties based on th
 Note: the \code{\link[=as.ab]{as.ab()}} and \code{\link[=ab_property]{ab_*}} functions may use very long regular expression to match brand names of antimicrobial drugs. This may fail on some systems.
 
 You can add your own manual codes to be considered by \code{\link[=as.ab]{as.ab()}} and all \code{\link[=ab_property]{ab_*}} functions, see \code{\link[=add_custom_antimicrobials]{add_custom_antimicrobials()}}.
+
+\code{NA_ab_} is a missing value of the new \code{ab} class, analogous to e.g. base \R's \code{\link[base:NA]{NA_character_}}.
 }
 \section{Source}{
 
@@ -111,3 +117,4 @@ if (require("dplyr")) {
 \item \code{\link[=ab_from_text]{ab_from_text()}} for a function to retrieve antimicrobial drugs from clinical text (from health care records)
 }
 }
+\keyword{datasets}