R/checkGrades.R

In nwfsc-assess/PacFIN.Utilities: Generate fishery composition data from PacFIN data for the NWFSC

#' Check Sample Numbers for Grade
#'
#' Ensure that each sample number has only one grade of fish in it.
#' 
#' @template Pdata
#' 
#' @author Kelli F. Johnson
#' @return todo: document what checkGrade returns.
#' 
checkGrade <- function(Pdata) {
  out <- tapply(Pdata$GRADE, Pdata$SAMPLE_NO,
    function(x) length(unique(x)) == 1)
  ifelse(all(out == 1), "One grade per sample number.",
    "More than one grade per sample number.")
}