#'
#' is x a trtsel object?
#'
#' Function to check if an object is of class "trtsel"
#'
#'
#' @param x Any R object.
#' @return Returns TRUE or FALSE depending on whether x is a "trtsel" object or
#' not.
#' @export is.trtsel
is.trtsel <-
function(x){
inherits(x, "trtsel")
}
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