#' @include mungebit_template.R
NULL
#' Replaces a variable in the dataframe.
#'
#' @name replace_variable
#' @param df dataframe. The dataframe to modify.
#' @param fun function. The function to run to convert the input into the new input. Whichever argument is passed first to the function is the variable that will be replaced.
#' @return Does not return anything, but modifies-in-place the dataframe to replace that variable.
#' @author Peter Hurford
#' @examples
#' # Repaces Sepal.Width to add 1 to each datapoint.
#' replace_variable()$run(iris, function(Sepal.Width) { Sepal.Width + 1 })
#'
#' # Repaces Sepal.Length to add the corresponding Sepal.Width to each datapoint for Sepal.Length.
#' replace_variable()$run(iris, function(Sepal.Length, Sepal.Width) { Sepal.Width + Sepal.Length })
#'
#' # Usage in a Syberia file
#' \dontrun{
#' list("Replace Sepal.Length with Sepal.Length + 1" = list(
#' replace_variable,
#' function(Sepal.Length) Sepal.Length + 1
#' ))
#' }
#'
#' @export
NULL
replace_variable <- mungebit_template({
train <- predict <- function(df, fun) {
new_variable()$run(df, fun, as.character(names(formals(fun))[[1]]))
}
})
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