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#' Axing a MASS discriminant analysis object.
#'
#' lda and qda objects are created from the \pkg{MASS} package, leveraged to
#' carry out linear discriminant analysis and quadratic discriminant
#' analysis, respectively.
#'
#' @inheritParams butcher
#'
#' @return Axed lda or qda object.
#'
#' @examplesIf rlang::is_installed("MASS")
#' library(MASS)
#'
#' fit_da <- function(fit_fn) {
#' boop <- runif(1e6)
#' fit_fn(y ~ x, data.frame(y = rep(letters[1:4], 10000), x = rnorm(40000)))
#' }
#'
#' lda_fit <- fit_da(lda)
#' qda_fit <- fit_da(qda)
#'
#' lda_fit_b <- butcher(lda_fit)
#' qda_fit_b <- butcher(qda_fit)
#'
#' weigh(lda_fit)
#' weigh(lda_fit_b)
#'
#' weigh(qda_fit)
#' weigh(qda_fit_b)
#'
#' @name axe-mass
#' @aliases axe-lda
#' @aliases axe-qda
NULL
#' @rdname axe-mass
#' @export
axe_env.lda <- function(x, verbose = FALSE, ...) {
res <- x
res$terms <- axe_env(res$terms, ...)
add_butcher_attributes(
res,
x,
add_class = TRUE,
verbose = verbose
)
}
#' @rdname axe-mass
#' @export
axe_env.qda <- axe_env.lda
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