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#' Get the assign attribute of model matrix of a model
#'
#' Return the assign attribute attached to the object returned by
#' [stats::model.matrix()].
#'
#' @param model (a model object, e.g. `glm`)\cr
#' A model object.
#' @export
#' @family model_helpers
#' @seealso [stats::model.matrix()]
#' @examples
#' lm(hp ~ mpg + factor(cyl), mtcars) |>
#' model_get_assign()
model_get_assign <- function(model) {
UseMethod("model_get_assign")
}
#' @export
#' @rdname model_get_assign
model_get_assign.default <- function(model) {
model_matrix <- model_get_model_matrix(model)
get_assign <- purrr::attr_getter("assign")
assign <- model_matrix |> get_assign()
if (is.null(assign)) {
# an alternative generic way to compute assign
# (e.g. for felm models)
model_matrix <- tryCatch(
stats::model.matrix(stats::terms(model), stats::model.frame(model)),
error = function(e) {
NULL # nocov
}
)
assign <- model_matrix |> get_assign()
}
if (!is.atomic(assign)) {
return(NULL)
} # nocov
attr(assign, "model_matrix") <- model_matrix
assign
}
#' @export
#' @rdname model_get_assign
model_get_assign.vglm <- function(model) {
model_matrix <- model_get_model_matrix(model)
get_assign <- purrr::attr_getter("orig.assign.lm")
assign <- model_matrix |> get_assign()
attr(assign, "model_matrix") <- model_matrix
assign
}
#' @export
#' @rdname model_get_assign
model_get_assign.model_fit <- function(model) {
model_get_assign(model$fit)
}
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