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#' Forms component group ID vector of X
#'
#' This function returns a vector which lets WQS.fit know the size and order of groups in X
#'
#' @param df A dataframe containing named component variables
#' @param num.groups An integer representing the number of component groups desired
#' @param groups A list, each item in the list being a string vector of variable names for one component group
#'
#' @return A vector of integers, each integer relating how many columns are in each group
#'
#' @examples
#' data("WQSdata")
#' group_list <- list(c("X1", "X2", "X3"), c("X4", "X7"), c("X5", "X6", "X9", "X8"))
#' x.s <- make.x.s(WQSdata, 3, group_list)
#' x.s
#' @export
make.x.s <- function(df, num.groups, groups){
x.s <- numeric()
for (i in 1:num.groups){
x.s[i] <- length(groups[[i]])
}
return(x.s)
}
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