From c03fa5d4e57033869cb437c1154da31abd96fc50 Mon Sep 17 00:00:00 2001
From: Johannes Ranke <jranke@uni-bremen.de>
Date: Fri, 14 Oct 2022 16:20:42 +0200
Subject: update method for mhmkin objects, clarify comment

---
 R/mhmkin.R | 23 +++++++++++++++++++++++
 R/saem.R   |  4 ++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/R/mhmkin.R b/R/mhmkin.R
index 2cf9ba06..2df01f0c 100644
--- a/R/mhmkin.R
+++ b/R/mhmkin.R
@@ -203,3 +203,26 @@ BIC.mhmkin <- function(object, ...) {
   dimnames(res) <- dimnames(object)
   return(res)
 }
+
+#' @export
+update.mhmkin <- function(object, ..., evaluate = TRUE) {
+  call <- attr(object, "call")
+
+  update_arguments <- match.call(expand.dots = FALSE)$...
+
+  if (length(update_arguments) > 0) {
+    update_arguments_in_call <- !is.na(match(names(update_arguments), names(call)))
+  }
+
+  for (a in names(update_arguments)[update_arguments_in_call]) {
+    call[[a]] <- update_arguments[[a]]
+  }
+
+  update_arguments_not_in_call <- !update_arguments_in_call
+  if(any(update_arguments_not_in_call)) {
+    call <- c(as.list(call), update_arguments[update_arguments_not_in_call])
+    call <- as.call(call)
+  }
+  if(evaluate) eval(call, parent.frame())
+  else call
+}
diff --git a/R/saem.R b/R/saem.R
index 99712c92..5256f6b5 100644
--- a/R/saem.R
+++ b/R/saem.R
@@ -635,8 +635,8 @@ logLik.saem.mmkin <- function(object, ...) return(logLik(object$so))
 update.saem.mmkin <- function(object, ..., evaluate = TRUE) {
   call <- object$call
   # For some reason we get saem.mmkin in the call when using mhmkin
-  # so we need to fix this in order to avoid exporting saem.mmkin
-  # in addition to the S3 method
+  # so we need to fix this so we do not have to export saem.mmkin in
+  # addition to the S3 method
   call[[1]] <- saem
   update_arguments <- match.call(expand.dots = FALSE)$...
 
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