Nothing
#' Convert factors to label-corresponding numeric values
#'
#' Converts a vector factor aware of numeric values not being scrambled.
#'
#' @param v the vector
#' @param warn if not missing: character with error message stating conversion
#' error
#'
#' @return the converted vector
util_as_numeric <- function(v, warn) {
if (is.factor(v) && !is.ordered(v)) {
r <- suppressWarnings(as.numeric(levels(v))[v])
} else {
r <- suppressWarnings(as.numeric(v))
}
conversion_errors <- (is.na(v) | "" == trimws(v)) != is.na(r)
v_conversion_errors <- v[conversion_errors]
if (length(v_conversion_errors) > 5) {
v_conversion_errors <- head(v_conversion_errors, 5)
dot <- ", ..."
} else {
dot <- ""
}
if (any(conversion_errors)) {
if (is.factor(v)) {
util_warning("Could not convert %s%s to numeric values",
paste0(dQuote(v_conversion_errors), collapse = ", "), dot,
applicability_problem = FALSE)
}
if (!missing(warn) && length(warn) == 1 && is.character(warn) &&
!is.na(warn)) {
util_warning(warn, paste0(dQuote(v_conversion_errors), collapse = ", "),
applicability_problem = FALSE)
}
}
r
}
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