#' #'Function to calculate the Drought Suceptibility Index (DSI) using mean yield values
#' #'
#' #'@param ylmeans A data frame with yield means. Included genotypes and Factor.
#' #'@param clabel The label of water control factor. Example: "irrigation","normal irrigation"
#' #'@param slabel The label of water stress factor. Example: "stress", "inttermitent
#' #'@return The drought suceptible index using means
#' #'@author Omar Benites
#' #'@details This function returns the drought suceptible index (DSI) using means.
#' #'@references Comparison of yield based drought tolerance indices in improved varieties, genetic stocks and landraces
#' #'of potato (Solanum tuberosum L.)
#' #'@keywords index, drought
#' #'@family index
#' #'@export
#'
#' #DSI <- function(dfmeans,clabel=NA, slabel=NA)
#' DSI.means<- function(ylmeans,clabel=NA, slabel=NA)
#' {
#' if(missing(ylmeans)){
#' stop("Please enter data frame of yield means")
#' }
#'
#' if(missing(clabel)){
#' stop("Please enter the control condition")
#' }
#'
#' if(missing(slabel)){
#' stop("Please enter the stress condition")
#' }
#'
#' # mysubset <- function(df, ...) {
#' # ssubset <- deparse(substitute(...))
#' # subset(df, eval(parse(text = ssubset)))
#' # }
#' mysubset <- function(df, ssubset) {
#' subset(df, eval(parse(text=ssubset)))
#' }
#'
#' yield.mean<- function(yf){
#' ym <- mean(yf[,3],na.rm = TRUE)
#' ym
#' }
#'
#' if(!is.na(clabel)){
#' #wc <- subset(ylmeans,FACTOR==clabel) #control
#' wc <- mysubset(ylmeans,paste("FACTOR","==",paste("'",clabel,"'",sep = ""),sep = ""))
#' names(wc) <- c("INSTN", "FACTOR_C", "TTWP_Mean_C")
#' }
#' if(!is.na(slabel)){
#' #ws <- subset(ylmeans,FACTOR==slabel) #stress
#' #ws <- mysubset(ylmeans,FACTOR==slabel)
#' ws <- mysubset(ylmeans,paste("FACTOR","==",paste("'",slabel,"'",sep = ""),sep = ""))
#' names(ws) <- c("INSTN", "FACTOR_S", "TTWP_Mean_S")
#' }
#'
#' #yfactor: yield mean by factor
#'
#' Mc <- yield.mean(wc) #control
#' Ms <- yield.mean(ws) #stress
#'
#' indextable<- merge(wc,ws,by = "INSTN") #merge the two tables by INSTN
#' indextable$DSI <- NA
#'
#' if(length(indextable$TTWP_Mean_S)>0 & length(indextable$TTWP_Mean_C)>0) indextable=within(indextable,{
#' DSI <- round((1-(indextable$TTWP_Mean_S/indextable$TTWP_Mean_C))/(1-(Ms/Mc)),2)
#' # DTI <- round((TTWP_Mean_S*TTWP_Mean_C)/(Mc)^2,2)
#' # TOL <- round((TTWP_Mean_C-TTWP_Mean_S),2)
#' # MP <- round((TTWP_Mean_C+TTWP_Mean_S)/2,2)
#' # GM <- sqrt(TTWP_Mean_S*TTWP_Mean_C)
#' # TDWS <- (TTWP_Mean_S/TTWP_Mean_C)*100
#' })
#'
#' return(indextable)
#' }
#'
#'
#' # if(trial == "Abiotic stress") {
#' #
#' # lvl1 <- as.character(hot_params()$hot_factor_lvl1)
#' # lvl2 <- as.character(hot_params()$hot_factor_lvl2)
#' #
#' # fb <- readxl::read_excel(hot_file, sheet ="Fieldbook")
#' # di <- drought_index(fb, lvl1, lvl2)
#' #
#' # if(!is.null(di)){
#' #
#' # sheet <- "Drought_Indexes"
#' # sheets <- readxl::excel_sheets(path = hot_file)
#' #
#' # if(sheet %in% sheets){
#' # openxlsx::removeWorksheet(wb = wb, sheet = "AbioticS_Indexes")
#' # }
#' #
#' # openxlsx::addWorksheet(wb = wb, sheetName = sheet, gridLines = TRUE)
#' #
#' # try(openxlsx::writeDataTable(wb, sheet = sheet, x = di ,colNames = TRUE, withFilter = FALSE))
#' # try(openxlsx::saveWorkbook(wb = wb, file = hot_file, overwrite = TRUE) )
#' #
#' # }
#' #
#' # }
#' #
#' # https://cgiar-my.sharepoint.com/personal/o_benites_cgiar_org/_layouts/15/onedrive.aspx?view=3
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