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#' Guess name of value column
#'
#' Strategy:
#' \enumerate{
#' \item Is value or (all) column present? If so, use that
#' \item Otherwise, guess that last column is the value column
#' }
#'
#' @param df data frame to guess value column from
#' @keywords internal
guess_value <- function(df) {
if ("value" %in% names(df)) return("value")
if ("(all)" %in% names(df)) return("(all)")
last <- names(df)[ncol(df)]
message("Using ", last, " as value column: use value.var to override.")
last
}
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